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Re: Prop out of one piece?

Wed, 04/16/2014 - 15:54
I made a test prop from paint stirrer sticks and a square hub, about 20 inches. It is terribly out of balance. The blades are flat and square, but seems to catch plenty of air. I need to use some brass tubing for bearings.  I like the coils the guy mad...

Re: voltage to fully charge batteries

Wed, 04/16/2014 - 15:16
yes 52 volts or more but the 48 volt stator from the Dan's should be able to put that out.

voltage to fully charge batteries

Wed, 04/16/2014 - 14:35
I built a 10 foot Dan and Dan style turbine and would it for 48 volts. My question is will it fully charge a 48 volt battery setup or will I need to wire my batteries 24 volt and use a classic? Auto,s use 14 volts to charge a 12 volt battery, do I need...

Prop out of one piece?

Wed, 04/16/2014 - 13:33
Hi all,

for a fun project, I'm looking for a small propeller. Something like 40-70cm (15-25").
DIY propellers require a lot of work, and balancing isn't that easy too in my experience For that reason, I was thinking about a pre-cast propeller, some...

Re: generator and splitter

Wed, 04/16/2014 - 10:47
With this type of tree you use all the leaves and the stump for heat. Looks pretty nice. I wonder how many day old it is. Just a chuckle 13

Re: generator and splitter

Wed, 04/16/2014 - 08:18
There's still quite a few old circular firewood saws around too that attach to a tractor.  We had one for a Farmall.  The table slid back and forth on a stationary blade like what you're describing.

I still can't stack as well as this fellow:

Re: neg to pos

Tue, 04/15/2014 - 23:17
I've been going for awhile from here. I hooked up my reversed battery. It is running fine. I get 13.8 v out of it and it has been sitting for a long time. I will have my charger up here next week and will try to discharge it and recharge it correctly. ...

Re: generator and splitter

Tue, 04/15/2014 - 21:18
reminds me of my homestead days with my dad...he built a sawmill from a old 8hp motor..and a 20"? circular sawblade..with a long belt going down to the engine. my dad would grab one end of a log and i would grab the other --then feed it into the blade....

Re: 60 cells (30V) PV modules for 24V off grid?

Tue, 04/15/2014 - 21:16
Quote from: lifer on April 06, 2014, 04:51:36 AMI've been playing with Arduino (MEGA) for two days and I'm pretty disappointed about its capabilities. I just need something that could be remotely and dynamically programmed ...

Re: generator and splitter

Tue, 04/15/2014 - 20:14
Thanks.

This splitter was originally a vertical, 3-point hitch mounted type.  I think it is this company (though much older model):
http://www.americancls.com/Prod...

Re: Hugh Piggott blades, Fiberglass, testing and failures.

Tue, 04/15/2014 - 19:26
clockr,

I'm not experienced at all in this type of blade design process, so I can't add anything meaningful.  I did enjoy the photo-journal of your build and in particular the blade mold and fabrication on Nav*> (that other site ).  It's impressive w...

Re: 3ph conversion Magnet questions.

Tue, 04/15/2014 - 17:46
I have heard these arguments before.  I have a motor conversion.  To satisfy myself I'll rewind it to fill every slot.  What I feel is to use neodymium magnets is like paying 10$ dollars for a meal that only costs 1$.  I don't know whether to use 16. 1...

Re: Hugh Piggott blades, Fiberglass, testing and failures.

Tue, 04/15/2014 - 16:40
Have you ever considered using Kevlar fabric? Its a little more expensive but you can use the same epoxy resin you would use for fiberglass fabric. The other alternative would be carbon fiber, which is stronger and lighter than fiberglass and Kevlar, b...

Re: 3ph conversion Magnet questions.

Tue, 04/15/2014 - 16:09
How about curved magnets? Machine a rotor to fit http://www.magnet4less.com/product_info.php?cPath=1_15&products_id=2

Re: 3ph conversion Magnet questions.

Tue, 04/15/2014 - 15:07
Everything is a compromise and with wind power everything seems to work backwards. You need the highest flux to get low cut in with minimum number of turns but this comea at the price of high iron loss in low winds.

If you want the best possible low wi...

Re: generator and splitter

Tue, 04/15/2014 - 14:27
Kite, you make me jealous! Look at all that wood. Nice shed too.

What splitter head do you use? Makes me think about making an electric powered version.

Jonathan

Re: 3ph conversion Magnet questions.

Tue, 04/15/2014 - 13:48
Quote from: Smithson on Today at 12:50:42 PMI don't understand why when the subject of motor conversion comes up neodymium magnets  are the choice.  What is wrong with ceramic magnets grade 8? 

the underlyi...

Re: 3ph conversion Magnet questions.

Tue, 04/15/2014 - 12:50
I don't understand why when the subject of motor conversion comes up neodymium magnets  are the choice.  What is wrong with ceramic magnets grade 8?  Neodymium magnets saturate the iron and cause severe cogging.  Even with skewing.  On top of that depe...

Re: 3ph conversion Magnet questions.

Tue, 04/15/2014 - 12:49
Also,
Not convinced Lee Valley sells the best magnets for this.  Theirs tend to be thin (1/8" thick) and small (1/2" diam). 
I can get any size of brick I can imagine at KJ Magnetics, for slightly greater cost, but then I'm not constrained to a small ...