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Polls / Re: Why did you get involved in alternative energy?
« Last post by bergmanj on Today at 07:36:20 AM »
Finnsawyer:

I've not been here for 10 years: I'm interested: Where can I see your work?

Thanks,   JLB
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Wind / Re: Active Pitchcontrol
« Last post by XeonPony on Today at 04:56:21 AM »
Any system I build that requires torque transmission for control I use splined or keyed shaft, being the key runs same length as the shortest member, failing those two usually a couple grub screws or roll pin, just some sort of positive locking system.

As time goes vibration and water ingression can cause enough slippage for bad things to happen.
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Wind / Re: Active Pitchcontrol
« Last post by mbouwer on Today at 03:21:24 AM »
You are right. Safety first.
Can we get in touch with forum members who can implement strength calculations?

Attachments: centrifugaal kracht.jpg * centrifugaal kracht.jpg ( - downloaded times.)

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Polls / Re: Why did you get involved in alternative energy?
« Last post by finnsawyer on January 17, 2018, 10:34:00 PM »
     Re: Thinking outside the box.  I became interested in wind power during the energy crisis of the 1970's after I lost my position at Michigan Tech.  Being an engineer, I wanted to know how a windmill worked (all of the horizontal axis types).  Eventually, I found this site.  Ten years ago I posted my theory for their operation in a post entitled "The Betz Limit - Again".  It was promptly ignored.  So much for thinking outside the box.  Better luck next time.  8)     
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Hydro / Re: Hey all
« Last post by mab on January 17, 2018, 03:07:12 PM »
Well, I can't argue with that  ::)
 ;D
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Other / Re: motor as a generator question
« Last post by hiker on January 17, 2018, 02:54:01 PM »
A drill would stop instantly....simple set up..? Should easly power up a string of LEDs
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Other / Re: motor as a generator question
« Last post by toozie21 on January 17, 2018, 08:37:39 AM »
Wow, very sorry I dropped off there, I am back now!!!!  ;D

Thanks for all the help.  Reading here and elsewhere and thinking about it on long commutes, I think the easy way is the right way to go.

I am thinking of using the generator to be a tip-off to either a micro, or potentially, the LM3914.  My head was originally about power the LEDs directly, but I am thinking that that is too hard based on SparWeb's nice write up.

One thing I really want to do is make sure that  I use something like a freewheel from a bike so that when a kid stops turning the crank really hard, it doesn't keep whipping around and snapping some kids wrist or something.  Besides the freewheel, I am not sure what the other options are.
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Wind / Re: Active Pitchcontrol
« Last post by XeonPony on January 17, 2018, 07:40:55 AM »
I'd be uncomfortable personally relying on pure friction to transmit torque to my blade, I'd use some sort of locking pin into the blade root my self.

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Hydro / Re: Hey all
« Last post by electrondady1 on January 17, 2018, 06:55:41 AM »
there you go .it's wise to please your sweety
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