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Date: Fri, 20 Jan 2006 13:50:21 -0500
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] flywheel weight?
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Russell Duffy wrote:

> Anyone want to take a swag at how well this would work? 

I'll take a shot.  I can WAG with the best of them.  Not so good at 
getting answers right, but I can WAG all day.

10lbs.  That is about the weight of a rotor.  But you'll be spinning it 
3 times as fast, so it'll have 8 times the momentum (momentum is 
velocity squared, right?).  The object is to keep the shaft from 
speeding up and slowing down, and I think increasing the momentum 8 
times would accomplish that well.

other ideas:  Have the disc water/laser cut.  And you don't need 4130, 
so have the cutter use whatever steel they have on hand.  Have a brake 
shop turn the disc and balance it, or you might just be able to get a 
brake rotor that would bolt right into place with little or no 
modification.  The heavy duty Matco rotors I just bought seem to be 
around those dimensions if memory serves.

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