Recent Posts

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1
Other / Re: Steam Engine!!!
« Last post by JW on Today at 06:04:39 PM »
I have had sometime to digest all this.

Quote
If the impeller is stalling at the high rpm

Well I tried the multistage turbine for HVLP paint spraying and Im getting better results with a RoadPro RPSC-807 10" 12V Super Wet/Dry Vacuum with 1 Gallon Canister.

what I did was reverse the motor plate and turned it into a blower. I wonder about optimizing the impeller to prevent stall. I think Im doing good with what I have, but I would love to use a custom impeller that would press on a 1/8th shaft. If anyone does 3D printing let me know, I will make a video of the performance im getting with the stock impeller. And can provide the basic impeller im using.
2
Other / Re: Honda 2200 generator
« Last post by skid on Today at 08:59:33 AM »
2200 watts / 120 volts = 18 amps. I'd change the breaker from 15 up to 20 amps. A lot of times high currents  are only there for a brief time such as start-up inrush current on electric motors. If you are continually running 20 amps then maybe get a bigger generator.
3
Heating / Re: Running 24 VDC Freezer off 48 VDC Battery Bank
« Last post by armadillo on September 20, 2017, 09:59:25 PM »
I made a buck converter with two irfz46 fets and it turned 50v at 5 amps into 24v at 10 amps iirc, running on a fixed 50% duty cycle, so thats 97% approximately.

You could probably find a pwm generator board on ebay for 3$ and the rest of the components could be found from scrap electronic crap. If you could find a 5v cellphone charger to supply 5v to the pwm board from a 48v bank you could wouldnt have to build a linear regulator to do it, saving a couple bucks
I'm not an electronics guy by any stretch of the imagination. You're way over my head.  Thanks for your reply.
4
Wind / The Use of Surplus Helicopter Blades in Wind Turbines
« Last post by vassile52 on September 20, 2017, 09:47:20 PM »

http://www.jstor.org/stable/43749328?seq=1#page_scan_tab_contents


Wu Yundong
Wind Engineering
Vol. 12, No. 1 (1988), pp. 48-58
Published by: Sage Publications, Ltd.
Stable URL: http://www.jstor.org/stable/43749328
5
Hydro / Re: 5kw Poncelet Wheel Project
« Last post by skid on September 20, 2017, 09:04:48 PM »
I was thinking I could sun tan on it in the summer ;D

I have a roll of burlap that I'll roll out on it tomorrow. I'll keep it wet for a week or so. It's cooled off here in the PNW so I'm not too worried about it drying too fast.
6
Storage / Re: battery salt
« Last post by thirteen on September 20, 2017, 08:43:49 PM »
thanks
7
Heating / Re: Running 24 VDC Freezer off 48 VDC Battery Bank
« Last post by joestue on September 20, 2017, 08:42:05 PM »
I made a buck converter with two irfz46 fets and it turned 50v at 5 amps into 24v at 10 amps iirc, running on a fixed 50% duty cycle, so thats 97% approximately.

You could probably find a pwm generator board on ebay for 3$ and the rest of the components could be found from scrap electronic crap. If you could find a 5v cellphone charger to supply 5v to the pwm board from a 48v bank you could wouldnt have to build a linear regulator to do it, saving a couple bucks
8
Hydro / Re: 5kw Poncelet Wheel Project
« Last post by Bruce S on September 20, 2017, 08:31:11 PM »
If the wheel doesn't work out , that could always be used as a ferry tie-up.
80000?! Wow! I've pushed a wheel barrow or 3 in my time, but not that much.
Is the weather gonna assist that the curing?
9
Hydro / Re: 5kw Poncelet Wheel Project
« Last post by skid on September 20, 2017, 06:58:34 PM »
Did I mention some concrete got poured today? 15.5 cubic meters of concrete went into the form which weighs over 80000 pounds. I could hardly sleep last night as I was worrying about the forms breaking loose and me spilling all that concrete into the river.

I beefed up the forms, especially on the river side. I wrapped 5 heavy duty ratchet straps around the forms as a safety measure, and used some 1x5 inch aluminum flat bar  to keep the form straight on the river side.

As we poured the concrete we (brother in law and me) tightened up on the ratchet straps as the concrete level matched the ratchet straps. This might have been a bit of over kill as I think tightening the straps caused the form to bow a little bit. Either that  or him going nuts on the vibrator :o

Gave the top a brush finish so it doesn't get slippery in winter or when it is raining. Filled the pipe with concrete too.
10
Hydro / Re: 5kw Poncelet Wheel Project
« Last post by skid on September 20, 2017, 06:44:22 PM »
Skid
I too have to say, that is some seriously awesome workmanship.
Those waters always that swift and clear?

I'd drop a line in those waters any time, might be too deep for brown trout but bound to be something nasty in there, pike, walleye,,,

AND thanks for letting us drift on this thread 

Steeleye, Arctic Char, Trout, Salmon are the main sport fish in that river. September is typically the lowest flows of the year as most of the snow in the mountains has melted

AND thanks for letting us drift on this thread 



Thanks for the detailed and constant updates and pictures.
Something to really be in awe of the engineering and effort you are putting into this. Really does push the boundary's of DIY whats for sure.
Do you think you might have it turning in the water by Christmas?

I sure hope so. Just got approval from the local utility for net metering. All I need now is the electrical inspection.
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