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Rahai vawt anyone? | 23 comments (23 topical, editorial)

Re: Rahai vawt anyone? (3.00 / 0) (#13)
by fungus (info@reenergy.co.uk) on Sat Mar 15th, 2008 at 06:13:21 PM MST
(User Info) http://www.reenergy.co.uk/

"I hope you don't mind" .. considering they're 700K each I'm assuming quite a few peopl e will.

'Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.'-Albert Einstein
Fungus - www.reenergy.co.uk

Re: Rahai vawt anyone? (3.00 / 0) (#14)
by TomW on Sat Mar 15th, 2008 at 08:03:46 PM MST
(User Info)

Fungal;

I killed the comment, 2 megs in one comment is a blatant size violation.

TomW

"Education consists mainly of what we have unlearned."--Mark Twain
[ Parent ]

Re: Rahai vawt anyone? (3.00 / 0) (#15)
by electrondady1 on Sun Mar 16th, 2008 at 07:49:48 AM MST
(User Info)

hello john,
your farm machine hub looks very strong.
it should be able to support a large vawt.
clean it up and paint it to look nice .
find a farm or auto parts place and get some new bearings for only a little money

i have seen the rahi profile before.
is it considered to be superior?

what is the total swept area of your device?.

remember automotive alternators are designed to turn at more than 1,000 rpm.
there are bettor ones to use .

don't give up when things get difficult.
good luck !

[ Parent ]

Re: Rahai vawt anyone? (3.00 / 0) (#17)
by john j on Sun Mar 16th, 2008 at 01:46:37 PM MST
(User Info)

Thanks Dady, In my motorcycle days, the saying was: If it doesnt run, chrome it (-; Paint will come later. Bearings in hub are mint condition, after what, 25 years?
I dont know how to calculate swept area, its 1.1 metres high and 1.1 metres in diameter. As I plan to run the car alt off the base of the rim, I guess Ill have a 15:1 increase in rpm. Should be OK, I hope. If things work as I hope, Ill come back to better alternator design.

Cheers, john j
[ Parent ]

Re: Rahai vawt anyone? (3.00 / 0) (#20)
by feral air on Sun Mar 16th, 2008 at 02:48:39 PM MST
(User Info)

Sorry, I didn't notice the size...my bad. We just recently got a satellite connection after having dialup for forever...I know how bad it can suck at dialup speeds. I'll be more careful in the future. take it easy

[ Parent ]

Re: Rahai vawt anyone? (3.00 / 0) (#16)
by john j on Sun Mar 16th, 2008 at 01:37:51 PM MST
(User Info)

"considering they are 700K each" and "human stupidity" could you be a little more clear? Think Im missing the point.....
Cheers, john j
[ Parent ]

Re: Rahai vawt anyone? (3.00 / 0) (#18)
by TomW on Sun Mar 16th, 2008 at 01:49:03 PM MST
(User Info)

jj;

Well, there are size limits on photos. Any one of those broke that rule and 3 at once fractured it.

Clear now?

The stupidity thing is his .sig line not necessarily a comment on this post.

Not sure why folks don't "get" .sig lines. They are apopended to all comments from the individual.

You are welcome.

T

[ Parent ]

Re: Rahai vawt anyone? (3.00 / 0) (#19)
by john j on Sun Mar 16th, 2008 at 01:52:32 PM MST
(User Info)

Thanks Tom, Ill try and reduce
Cheers, john j
[ Parent ]

test rig turning, pics (3.00 / 0) (#22)
by john j on Fri Apr 4th, 2008 at 02:53:42 AM MST
(User Info)

Just got the stoneage vawt up. There will be more sets of wings to come. Just wanted to see how it reacts. It starts turning with very little wind. I tried to measure resistance in the very heavy bearing. If I measure correctly, turning of the hub and bearing takes 29 volts and 0.05 amps. Cost so far: about 100 US$
Cheers, john j
[ Parent ]

Re: test rig turning, pics (3.00 / 0) (#23)
by ghurd on Fri Apr 4th, 2008 at 07:43:19 AM MST
(User Info)

Probably work a lot better if the top is covered.
Just for a quick test, maybe slap a piece of 3/8" plywood on top with tarp straps?
G-

[ Parent ]

Re: test rig turning, pics (3.00 / 0) (#24)
by john j on Sat Apr 5th, 2008 at 05:21:33 AM MST
(User Info)

Yes I think youre right. Only its hard to know any difference, as I dont have an alternator yet. And even then, how would you measure output? Thanks anyway.
Cheers, john j
[ Parent ]

Rahai vawt anyone? | 23 comments (23 topical, 0 editorial)

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