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451
Coil winding / Re: How to determine the lmits of a coil / magnet configuration
« Last post by MagnetJuice on February 13, 2024, 12:23:59 AM »
Hi brandnewb,

After your many requests for help, I'll agree to help you with the design of the alternator for your Phoenix VAWT.

I have read many of the posts on the diysolarforum, where you started your journey to build the 'sickest VAWT' over 2 years ago.

From the beginning, there were some users there and on this Forum that gave you good and sound advice. It is possible that you could not grasp what they were telling you. That is probably why you chose to continue to do it your way, even without a clear understanding of some of the simplest electrical terms and without an understanding of electromagnetism. It takes time and a lot of effort to learn that stuff.

At least you have perseverance and enthusiasm, that is good and commendable, but as I told you in the IM's, it will only help you if you have goals and stay focused.

I don't know how successful I will be in getting you back on the road, but I am going to give it a shot.

You have said many times that you want to do some tests that will help this Forum. So I am going to suggest some useful tests that you can do that will be helpful to us here and will help you acquire good data for your future BIG alternator.

I will start with this statement; you cannot get useful data by doing tests with the coils and magnets that you are using now, and I'll tell you why.

The magnets that you are using are too small and they have the wrong proportions of length to width, and they are too thin. Nobody will ever seriously think about using magnets like that to build an alternator. So, any tests that you do with those magnets are not useful when it comes to building an alternator.

When you asked about stacking magnets, Adriaan wrote this:

"However, if the total magnet thickness is about the same as the total air gap thickness, you can better keep it as it is"

I think that you missed that. What Adriaan said is that the ideal air gap for your 5mm thick magnets is 5mm. The 3 overlapping coils that you have are about 30mm thick? At 30mm, the flux reaching the coil will be less than 15%. You need thicker and wider magnets.

The coils that you are using now are useless for any type of alternator. The wire is too thin and with too many turns. That makes the resistance way too high.

This equation, P = (I^2) x R is used to find the power dissipated by a resistor in watts.

Remember this, when you build an alternator and you wire all the coils, the finished alternator becomes a large resistor.

Most of the alternators that are built by some of the members here have coils with resistance of .5 ohms or less. The resistance of your coils is about 9 ohms per coil.

P = (I^2) x R
P = power in Watts
I= Current in Amps
R= Resistance in Ohms

Example:

If resistance of one coil is .5 ohms, 3 coils in series is 1.5 ohms.

Assume that the current is 15 amps and voltage is 58 volts.

Total alternator power = 870 watts

P=(15x15) x 1.5 = 337 watts dissipated as heat in the stator.

Now let’s see how much power will be dissipated with 3 of your 9 ohms coils.

P=(15x15) x 27 = 6,075 watts (HEAT) dissipated in the stator.

That will not be called an alternator. It will be a copper smelter.

The bottom line, you need to keep coil resistance at .5 ohms or less.

The only way to do that is to use less turns and use at least 1mm wire for the coils.

If you can build a good testing platform with 2 rotors similar to this, it will help a lot:



It doesn’t have to be that big, 8 or 12 magnets per rotor should be OK.

You already have a Variable Frequency Drive. All you would need is a 2 HP 3-phase electric motor for turning the rotors at different speeds. Or you can use your Variac to turn a DC motor. The DC motor might be a better choice because the VFD's have a hard time running at very low RPM.

With that setup you can test different coils with different air gaps at different speeds and do other tests to get useful data that could also be of value to Forum members.

If you are interested in building the testing platform, let me know and I can help you with that.

Don't expect to get an electrical or electromagnetism education from Forums. We all learn mostly by doing and building things.

When you can sit in your warm home and look out the window and see the Phoenix spinning and making watts, then you will notice that you have learned quite a lot. And if you stay focused, that could be soon.

Ed

Attachments: Rotors.jpg * Rotors.jpg

452
Wind / Re: Classical US multibladed metal wind rotor....?
« Last post by bigrockcandymountain on February 12, 2024, 05:50:24 PM »
I think that one is 8 or 10m high.  It's very wide open country, so seems to work fine.  I also use the tower with a rope pulley at the top to pull up the pump when it needs leathers.  The pump is only down 4m / 12' or so, so it's an easy job. 

Adriaan is right saying that the towers also had to straddle a large diameter well in lots of cases.  That one is a 30" casing. 

I actually put this mill up when I was a teenager.  The old well caved in, so we had a new one bored about 20' away, and moved the windmill over.  While the mill was down, i went through it and painted the cast parts.  That's why it still has red paint.  That was probably close to 20 years ago now. 

Yes, that is a big earthmover tire.  They are free and should last 100 years or so.  Cows aren't exactly gentle creatures when they all get to the trough at the same time.  It takes a beating.  It's a difficult job to cut out the sidewall.  A reciprocating saw and lots of soapy cooling water.  The other sidewall stays, and the rim hole gets filled with concrete.  I think it holds about 2500L Maybe 3000L of water. 

I guess i should also mention the solar panels.  2x 240w i think.  They run a solar submersible pump.  The solar pump only runs when it is sunny.  No batteries.  Between that and the windmill, there is always water. 
453
Logged in diaries / Re: VAWT backyard experiements
« Last post by JW on February 12, 2024, 04:25:32 PM »
Reply

Here my obvious looking/.

For Me its ben posting videos

The system, login
454
Coil winding / Re: How to determine the lmits of a coil / magnet configuration
« Last post by MattM on February 12, 2024, 02:12:15 PM »
With magnetism the force lines are always uniform.

If they are not then another influence is present.
455
Wind / Re: Classical US multibladed metal wind rotor....?
« Last post by Bruce S on February 12, 2024, 12:55:51 PM »
BRCM;
What kind of height you have on the one in the pic? 15M+?

I had to look a few times to make sure that was in fact a tire that was being used for a water trough


Bruce S

456
Coil winding / Re: How to determine the lmits of a coil / magnet configuration
« Last post by JW on February 12, 2024, 12:41:34 PM »
Man your really into theory.

Most of us are into Proactive " proactive/practical application"

Carry on
457
Coil winding / Re: How to determine the lmits of a coil / magnet configuration
« Last post by brandnewb on February 12, 2024, 11:56:35 AM »
yeah no, there is just no way yet I can demonstrate repelling to be generating more voltage than traditional in this dual rotor setup.
Not even when going double density.

And yes sure I am comparing apples to oranges making things rather hard to take seriously. Even for me the one designing and running the experiments.

But it ain't over till the fat lady sings yes?

Just do not hold you breath. I certainly no longer am not. But I just need to see so I can close the pages on this matter once and for all.
458
Transportation / Re: EV Market, 20-Year Bet
« Last post by bigrockcandymountain on February 12, 2024, 11:48:51 AM »
I always thought i might add a webasto diesel heater for the extreme cold.  Would that make it a hybrid?

I'm seeing prices drop significantly, to the point that they compete just fine against ICE new vehicles price wise. 

None in the "under $5k canadian dollars" range yet, so i guess i remain a spectator.  There are a few every week on the salvage sales that have been crashed.  Still tempted to buy one and do a conversion on an old chassis.  Most of them are Tesla though, and i don't think Tesla is my first choice for a parts donor.  Too much complicated computer stuff.  A nissan leaf or 2 would be better from what i can tell. 

In my opinion, the charging station thing is way overblown.  95% of charging is going to happen at home.  People can't seem to get their head wrapped around that idea. 

459
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 12, 2024, 10:22:22 AM »
BTW, that is not to say that I think I do not need advice.

I think we have already established that I can use advice more than anyone else!!

So if you see something on the turbine that warrants attention then please let me know.

I will always love you for it even if I already saw that particular issue.
It is my 70% 30% 100% rule.

Even though I might already know 70% of the advice given. it are the 30% we are looking for. And the thanks extended to any advice should always be a 100%.
460
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 12, 2024, 10:13:11 AM »
I am aware of a million things to improve upon.

And I can imagine there are like a ten fold of that on things I am not yet aware of I need to improve on.

It is just so peaceful and mesmerizing watching the phoenix spin. How ever slowly. Yet slow is what we want!! slowwww is better in this context.
461
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 12, 2024, 10:09:56 AM »
Please witness the bird at glide mode on the new column. Stealth if you will even. But then only for the auditory sensors.

Attachments: bird at glide.gif * bird at glide.gif

462
Transportation / Re: EV Market, 20-Year Bet
« Last post by Bruce S on February 12, 2024, 09:45:34 AM »
There is one group of EVs I'm not seeing in the reports, but I'm kinda brain dead from this last weekend's workout.
There's a sub-group of people purchasing the tini-EVs through Alibaba & Ali-express. There's already a couple of them here in the StL area. 2 are urban only ~max speed held to ~ 50Km/hr.
Unfortunately they are still coming with SLAs in them as the cost of getting here with Li based batteries are still $$$. We don't normally get the long-term arctic temps but this year has been "different". The biggest issue they have is like Mary B stated; freezing inside the cab is a No-Go when trying to
Our charging stations are all over town, so getting to one shouldn't be an issue. Again the issue being that unless you have one of the Apps that shows where they are ya just don't know.
All of the ones I've been around to look at, are also currently underwritten by local gov so they're not even charging $ to be used.
Here at HQ we have two, luckily we got the word out so the City's EVs and local Broadcasting stations come here to charge and say hi. They're also a good source of hi-quality pre-ground coffee beans  ;D.

Cheers
Bruce S

 

 
463
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 12, 2024, 09:34:14 AM »
ohh wow!! I just realized why going floating might be the dumbest idea ever.

All this effort I put into keeping things safe and working towards having this bird float on water. The very water my family , neighbors and my self swim in each summer. With potentially lethal currents going mayhem.

Bad IDEA
464
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 12, 2024, 09:29:36 AM »
more than 7KG breaking force required to stop the blades spinning at around 3.4m/s

It would be great if the Adriaan would come back and either confirm or deny that these readings are something to write home about.
465
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 12, 2024, 08:35:12 AM »
yeah no, this is proving rather impossible.
I am already at 8 seconds per revolution while the weather station registers 3.4m/s.
Now it is all about wind direction I think.

needless to say this will be difficult to really lay a finger on.
466
Coil winding / Re: How to determine the lmits of a coil / magnet configuration
« Last post by brandnewb on February 12, 2024, 08:33:07 AM »
So repelling at 3.75 degree interval on a 2 rotor setup does less than half as what traditional does in similar enough circumstances.

This is not looking good for that setup.

I will try now doubling the density. See if doubling the Hz will do something for this super narrow coils (after all they were wound that way for this specific scenario)
467
Coil winding / Re: How to determine the lmits of a coil / magnet configuration
« Last post by brandnewb on February 12, 2024, 07:56:40 AM »
I think that when orienting magnets traditionally then it be important not too close. I think a lot of the field is not going through the coils but is diverted in between adjacent magnets.

Well that is what I will be testing next. To see if repelling without back plating (back plating in a repelling setup only hurts the field rather than benefit it)

But even so traditional with but a 15mm spacing between rotors already packs a punch. A hard one at that!

Look how crazy.
15837-0
15838-1
1.76 VAC at 3.6 Hz if I interpret the readings correctly. Now I would like to know if this is impressive or not.

{1}
So here the coils are 200 winds very narrowly wound @ 0.4mm diam wires.
They are not stacked yet spaced in such a manner to roughly end up with a 3 phase shift between them.
The reasoning (but open to debate as per usual) behind this configuration is that the heat dissipation ability can be more easily achieved than with while stacking coils.

And also regarding stacking coils, I still fear that the magnetic fields induced will suffer from interference. This phenomena one can see with waves.
But then again I first need to see that it in order to believe it ;)

{1}

{2}
Also I am worried that once the coils start behaving like electromagnets (as is the intend after all to actually produce power) then the magnets on the rotors might become persuaded to let go of the back plating :( Not at all something one looks forward to when a PMA is in operation.
{2}

Attachments: I think a lot of wasted potential.png * I think a lot of wasted potential.png traditional at 300mm ID with non stacked coils at 200 winds 0.4mm diam..png * traditional at 300mm ID with non stacked coils at 200 winds 0.4mm diam..png

468
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 12, 2024, 07:04:05 AM »
Ok I have given up on trying to correlate wind speed to an RPM and thus frequency of field reversals at low wind speeds (<3m/s).

Safe to say there is no consistency to be found and that is probably all because of turbulence and general wind direction that is changing a lot and within the footprint of the turbine I can imagine it being in a constant .. well turbulence. I am repeating my self ;).
The amount of work I have to put into analyzing a correlation is too off putting. It is not helping me to just get going.

So I am hoping for the wind to pick up again soon so I can take a few more looks at around 5m/s to see what kind of RPM the turbine rotates then.

But I would not be surprised that also then readings will be all over the place.

So I guess then I should be focusing on what is the max RPM allowed. and make sure that the PMA does something worthwhile well below that.

I also do not know a better idea at the moment :(
469
Wind / Re: Classical US multibladed metal wind rotor....?
« Last post by Adriaan Kragten on February 12, 2024, 04:18:24 AM »
I think mostly these mills were designed to be hauled back to the farm with a horse drawn wagon and then assembled by hand with no additional lifting apparatus etc.  That is part of the reason for the angle iron tower.  It collapses nicely for shipping, and then is light enough to erect by hand with minimal tools. 


These type of windmills have a rotor which is much heavier than the 3-bladed rotor of an electricity generating wind turbine with the same rotor diameter. The rotor is heavy because of the many steel blades and the supporting structure. The head is heavy because of the cast iron reducing gear box and the crank mechanism. These type of windmills make use of a 4-legs angle iron tower with a wide base because the tower must be placed over a well with mostly a rather large diameter.

So these towers have a large base and therefore a high natural frequency. The maximum rotational speed of the rotor is low because of the low tip speed ratio and the used safety system. The rotational speed in rev. per second is therefore always lower than the natural frequency of the tower. For fast running rotors of electricity generating windmills, one often uses a slender tower with a low natural frequency and this frequency is passed by the rotor at already a low wind speed for which there is only a little vibrational energy in the rotor. So fast running rotors normally turn at a rotational speed much higher than the natural frequency of the tower. It is no good idea to use the wide base tower of a traditional water pumping windmill for a fast running rotor because then the rotational speed of the rotor in rev. per second can become the same as the natural frequency of the tower in Hz for high wind speeds and this will result in strong vibrations of the tower. The rotor will always have some mass imbalance or some aerodynamical imbalance and this imbalance starts the vibration of the tower if both frequencies are the same.
470
Wind / Re: Classical US multibladed metal wind rotor....?
« Last post by Mary B on February 11, 2024, 11:07:31 PM »
I think mostly these mills were designed to be hauled back to the farm with a horse drawn wagon and then assembled by hand with no additional lifting apparatus etc.  That is part of the reason for the angle iron tower.  It collapses nicely for shipping, and then is light enough to erect by hand with minimal tools. 

They really are a wonderful design.  I can't say enough good things about them. They still have a very practical value for us pumping water for cattle.  Probably more so the farther backwoods /less developed the area.  Almost anything that goes wrong can be easily repaired with nothing more than some brazing rod.  I estimate the ones we use to be close to 80 years old, and out in the weather their whole life.

Since my county added a no wind turbine in town ordinance  I have been looking at the small pond aerator versions of these, but instead of driving a water pump drive a small generator... hey it is yard art! Would let me sidestep the idiots who signed onto the dumb USA country org garbage
471
Hydro / Re: 5kw Poncelet Wheel Project
« Last post by Mary B on February 11, 2024, 11:01:03 PM »
It IS his! I remember him testing that system to lower it...
472
Heating / Re: Combined Heat and Power
« Last post by ChrisOlson on February 11, 2024, 10:51:38 PM »
No, when I'm working in the shop I can pull 50KW and max out a 200A service pretty easy when I got the plaz table and welders going.

Edit: we have grid power here at the lake house and shop. But I can blow the main breaker on the 200A service just with the shop. I do a lot of work on heavy equipment, working with 1" sheet steel most of the time. Plus Kristin has all-electric stuff in the house - range, water heating, electric baseboard heaters when genset is running, clothes dryer, etc.. Doesn't take much to pull 100KW if we turn everything on. The new CHP unit is designed as a supplement, especially for working in my shop, which I spend most of the winter doing.
473
Heating / Re: Combined Heat and Power
« Last post by SparWeb on February 11, 2024, 10:46:50 PM »
Quote
I'm building a new CHP unit with, that will be big enough to heat both my shop and the house.
That'll be big enough for you and dozen of your neighbours!

Quote
doesn't require use of DEF
Good thing.
474
Transportation / Re: EV Market, 20-Year Bet
« Last post by SparWeb on February 11, 2024, 10:37:41 PM »
Yes, I heard some funny stories about EV's not coping with last January's cold snap.
475
Coil winding / Re: How to determine the lmits of a coil / magnet configuration
« Last post by JW on February 11, 2024, 09:28:07 PM »
476
Logged in diaries / Re: VAWT backyard experiements
« Last post by JW on February 11, 2024, 08:10:39 PM »
No, your fine.

I was hopping that you had made recipes and cook etc. Check out my link.

https://www.fieldlines.com/index.php/topic,144905.msg986159.html#msg986159
477
Hydro / Re: 5kw Poncelet Wheel Project
« Last post by MattM on February 11, 2024, 03:33:23 PM »
Thw waterwheel in this video looks like yours.

https://www.youtube.com/watch?v=lCNcwsglZP8
478
Wind / Re: Classical US multibladed metal wind rotor....?
« Last post by bigrockcandymountain on February 11, 2024, 02:19:17 PM »
I think mostly these mills were designed to be hauled back to the farm with a horse drawn wagon and then assembled by hand with no additional lifting apparatus etc.  That is part of the reason for the angle iron tower.  It collapses nicely for shipping, and then is light enough to erect by hand with minimal tools. 

They really are a wonderful design.  I can't say enough good things about them. They still have a very practical value for us pumping water for cattle.  Probably more so the farther backwoods /less developed the area.  Almost anything that goes wrong can be easily repaired with nothing more than some brazing rod.  I estimate the ones we use to be close to 80 years old, and out in the weather their whole life. 
479
Heating / Re: Combined Heat and Power
« Last post by ChrisOlson on February 11, 2024, 12:42:44 PM »
I got a John Deere 6068T diesel that I'm building a new CHP unit with, that will be big enough to heat both my shop and the house.

These are from Deere’s industrial lineup of G-drive and marine engines. They are HPCR with electronic unit injectors. Rated for 50,000 hrs to overhaul on irrigation or generator duty. It is 180hp @ 1,800 rpm and holds 45 liters (11.9 gallons) of oil, making it possible to run 500 hrs between oil changes. Used drain oil from the engine can go into the fuel tank, diluted with fuel and be burned. It is suitable for driving a 125KW split-phase generator and considerably more fuel efficient than our Caterpillar DE50. The 6068T is a Tier II engine, doesn't require use of DEF, 106mm bore x 127mm stroke giving it 6.8L (415 cubic inches) of displacement. It is 17:1 compression ratio, turbocharged and designed for intercooling, so heat can be extracted from the intercooler as well as the cooling system and exhaust.

The cooling loop for the engine (heating loop for the house and shop) will go thru the intercooler, then thru the engine's cooling system, then thru the exhaust cooler. Exhaust temperature @ rated load is 1,000F. The cooling system will be high pressure (25 psi) so the final stage in the loop will be heated to 280F 50/50 glycol-water that goes to the heat exchangers. We need enough radiant heat from the engine to heat the generator room and fuel system when it's below -20F outside so the engine block and exhaust manifold under the turbocharger won't be insulated. The engine weighs 1,820 lbs wet, so it has decent thermal mass as well, for continued heating of the generator room/fuel system when it is shut down without having have to use auxiliary heating to heat the room in sub-zero temps.

I chose this engine because it is near the pinnacle of current technology in diesel engines for thermal efficiency. It has 42% brake thermal efficiency at full load (fuel energy converted to mechanical power), with 28% wasted in exhaust gas, 4% going to pumping losses in a four-stoke cycle engine, 26% of fuel energy dissipating to cooling media as heat rejections to the ambient, including 3% going to mechanical losses as heat. It can be run at partial loads to adjust electrical and heating output as needed, just as efficiently as it runs at full rated load. Modern electronically controlled diesels are a total different world from the mechanical injection diesels of yesteryear, as the electronically controlled units can adjust both fuel rate and timing on-the-fly to optimize cylinder and turbocharger boost pressure and minimize emissions at partial loads. Unlike Otto-cycle engines, diesels run at peak volumetric efficiency because they are un-throttled, so they are an inherent lean-burn design with air-fuel ratios as high as 200:1 at very light loads in modern electronically controlled engines. The best an old Lister thumper could manage was ~40:1 air-fuel ratio at idle and around 15:1 at full load - not much better than a Otto-cycle engine. These new diesels run so clean they don't even leave any black soot in the exhaust pipes anymore. This particular engine can't qualify for on-road use because of NOx emissions, as it doesn't use SCR and runs extremely high combustion temperatures because it doesn't have cooled-EGR. But for a CHP unit it is perfect.

Total cost of the project I estimate at around $105,000 - the engine itself was a $27,000 component. Unfortunately, none of our existing plumbing or heat exchangers will work because they are a low pressure system. So we have to start over from scratch on the heating/cooling loops. It won't be running for this winter, but hope to have it completed for initial testing by next fall, and in full operation for next winter.

Edit: another plus with this engine is that is classified as a heavy duty industrial engine. It is used in John Deere ag and constuction equipment as well as G-drive and marine applications. It has replaceable wet cylinder liners, four valves/cylinder, the inline-six configuration has perfect primary and secondary balance without use of balance shafts, and the water pump is gear-driven instead of belt. It is very similar in design to the big block Cat (3406E/C15), which I think John Deere copied it from. But like the big block Cats, which became the first 2 million miles to overhaul engine in heavy duty trucks, this engine is designed to last with minimal maintenance.

Attachments: iPhoto-Export - 1 (2).jpg * iPhoto-Export - 1 (2).jpg

480
Coil winding / Re: How to determine the lmits of a coil / magnet configuration
« Last post by MattM on February 11, 2024, 12:31:31 PM »
By using the basics of Faraday's law you can see the inputs and then make some assumptions.
481
Coil winding / Re: How to determine the lmits of a coil / magnet configuration
« Last post by brandnewb on February 11, 2024, 10:39:59 AM »
Ok now my insecure nature kicks in again.

Am I adviced to just leave as this place is not it? What ever that meant.

I rather just keep on plowing through and share what I find out along the way.

If nothing else it will be a great journey,

But I think we already see it coming yes? Something wonderful!
482
Coil winding / Re: How to determine the lmits of a coil / magnet configuration
« Last post by brandnewb on February 11, 2024, 10:13:30 AM »
yes of course not ;)

since it is still my believe that it is about the speed in the change of field then a sudden dip to 0 would only add to the the voltage.

We should not be trying to visualize the voltage graph in a direct relationship to the field.

Patience my young padawan. Patience. You will get there.

what I do not yet understand though is that I do not see this sudden dip to 0 that I was expecting in between opposing fields.

I am guessing that the electrons in the copper wires are able to also pick up on fields that are not ideally perpendicular.
483
Transportation / Re: EV Market, 20-Year Bet
« Last post by Mary B on February 11, 2024, 09:48:19 AM »
Until they come up with an extreme cold friendly battery NOPE! And a cabin heater that works at -25f... guy I know who has one put a small propane space heater inside the cab t keep from freezing and to thaw the windows inside... his trips are all in town with it so range isn't the issue, not freezing is! He has an F150 for road trips...
484
Wind / Re: Classical US multibladed metal wind rotor....?
« Last post by Mary B on February 11, 2024, 09:44:44 AM »
One thing about these windmills is their minimalist approach.

Even the tower has minimal material to get pushed around in the wind.

The 4 legged angle iron tower actually has more wind resistance than the tubular towers used by the big wind turbines! The tubular towers split the wind instead of catching it...
485
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 11, 2024, 08:27:04 AM »
Quote from: supernewbe
hmmm I must be overlooking something glaringly obvious yet for me not yet visible.

I will update this thread/edit. Im cooking some food to  :)

Anyway JW, Let me just state that sharing food is a good way to bury hatchets.
So please accept my invitation that should you ever come over to the wrong side of the pond and be near by. Then please be my guest. I will make sure the dining table is full of abundance.

ohh my now I have to start practicing else risk yet other way of reputational damage if my food is not of quality ;)

I really mean this all light heartily and with intend to just be cool and frivolous.

Perhaps if you would extend me the courtesy of editing my own logbook/dairy? It would feel less of an invasion of personal space that way. I am sure that you intended it that way this section yes?
486
Wind / Re: Classical US multibladed metal wind rotor....?
« Last post by topspeed on February 11, 2024, 02:25:45 AM »
One thing about these windmills is their minimalist approach.

Even the tower has minimal material to get pushed around in the wind.

I agree...metal is in good use. ;)
487
Transportation / Re: EV Market, 20-Year Bet
« Last post by SparWeb on February 11, 2024, 12:58:44 AM »
Am I getting an EV yet?  Sadly, no. 
The prices are coming down a bit, thankfully. 
488
Transportation / Re: EV Market, 20-Year Bet
« Last post by SparWeb on February 11, 2024, 12:42:45 AM »
It's been a while - I'll update this thread.

The statistics seem to be late.  In the USA there were approximately 10 million new vehicles sold and 1.2 million of them were EVs.  That makes about 10-12% of the new car market.  It's not clear to me if these two numbers are exactly the same meaning, because one might include commercial vehicles while the other doesn't, and the 2023 data from these sources don't seem to be complete yet.
https://en.wikipedia.org/wiki/List_of_countries_by_motor_vehicle_production
https://www.oica.net/category/production-statistics/2022-statistics/


It's funny that I am still seeing articles about the SAME issues as I saw 10 or more years ago.
People are still uncertain about buying EV's (range anxiety), auto-makers are still not marketing or tailoring them to their customers (one-size-fits-all), and the lack of charging stations, and limited raw material supply are all still concerns being discussed in the media.  Will that never change?

This may be a never-ending agony only in North America.  Europe is already well on its way to parity between EV and ICE sales, while in China the EV market dominates the auto market.  There, buyers are treated to varieties and options to suit their needs, in numerous sizes and configurations of vehicles.  For a country that manufactures 3x more automobiles than the USA, I'm starting to believe they will be soon producing more EV's than all the vehicles produced in the USA.

Here's a look at the challenges in the US auto industry in early 2024:
https://spectrum.ieee.org/auto-industry
https://spectrum.ieee.org/the-ev-transition-explained-2659602311
489
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 10, 2024, 10:14:47 PM »
hahahahhahh



brandnubell

I love how you take effort to change my avatar name.


hahahha

it is a novel twist. One I have not ever seen before in all my years.

hahahha


490
Logged in diaries / Re: VAWT backyard experiements
« Last post by JW on February 10, 2024, 01:49:04 PM »
Quote from: supernewbe
hmmm I must be overlooking something glaringly obvious yet for me not yet visible.

I will update this thread/edit. Im cooking some food to  :)
491
Logged in diaries / Re: VAWT backyard experiements
« Last post by JW on February 10, 2024, 12:59:56 PM »
Quote from: brandnubell
The device I was referring to is called a "governor." In elevator systems,

When it comes to Wristwatch, my grandfather was a repair outfit.

I was talking to him about the "regulator" he said NO its the escapement... 
492
Wind / Re: Classical US multibladed metal wind rotor....?
« Last post by MattM on February 10, 2024, 10:19:24 AM »
One thing about these windmills is their minimalist approach.

Even the tower has minimal material to get pushed around in the wind.
493
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 10, 2024, 09:47:33 AM »
no, lift only comes into play when the self destruct mechanism has been proven to be reliable and also that the whole structure can float on water.

Only then we will see how far lift can increase things.
494
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 10, 2024, 09:40:57 AM »
it takes around 1.05 KG to stop the blades rotating while the wind speed is at around 1.5m/s

Do I have reason to celebrate or indeed go lift type ;(

I really am not looking forward to going lift at this stage in time.
495
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 10, 2024, 09:06:43 AM »
hahah this makes me realize that sometimes one does not need to understand something fully in order to use the effects of it ;)

I mean I am still breathing yet know sooooo little on how it actually works. ;)
496
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 10, 2024, 08:58:51 AM »
but this makes me question the whole concept of back iron plating.

I mean let us take a mental image.

The idea of back plating is to reduce the resistance for the field to travel trough right? But to where? Yes of course abviously the other pole but in a dual rotor setup where is that pole?
Indeed not on the same disk. So would not then back plating only hurt the intended gain?

hmmm I must be overlooking something glaringly obvious yet for me not yet visible.
497
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 10, 2024, 08:41:43 AM »
ok so early test results suggest that a back iron plating does not benefit a repelling configuration.

So that means that unless I find counter evidence the coming days then traditional still reigns supreme in this dual rotor setup.

498
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 10, 2024, 07:59:19 AM »
Hey Bruce, I hear you like making things yes?

Let us get together and make this speed govenor ;)

15835-0

Hahahah!! This is one of those times AI went totally over board ;)

Attachments: hilarious over the top.png * hilarious over the top.png

499
Logged in diaries / Re: VAWT backyard experiements
« Last post by brandnewb on February 10, 2024, 02:39:45 AM »
 >:(
There is just no way around hard work!! endless measurements and mistakes.

15834-0

To arrive at an PMA that at least does something then there are no shortcuts to be made I am afraid. You see whether repelling or traditional i can defend both configurations with equal passion and data.

I guess the only real way forward to know for sure is to make use of the process I described in my public thread. I just do not see an alternative yet ;(

Attachments: there is no way around hard work.png * there is no way around hard work.png

500
Wind / Re: Classical US multibladed metal wind rotor....?
« Last post by topspeed on February 10, 2024, 02:19:12 AM »
What I got out of this,  is the one who suggested a nose cone (center)

It seems to be also more efficient than similar propeller types in same size.....30%. It can be recycled unlike the huge HAWTs.
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