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Date: Fri, 20 Jan 2006 11:52:56 -0700
From: Dale Rogers <dale.r@cox.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] flywheel weight?
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Russell Duffy wrote:

> Greetings,
>  
> Yes, I'm trying to avoid spending too much time on this, but I'm 
> tempted to try adding more significant flywheel weight to the single 
> rotor, to see it it will behave better.  I realized this isn't an 
> ideal solution to an already heavy engine, but it might still be worth 
> trying. 
>  
> My question is how much weight should I add to make sure this will get 
> rid of the torque reversal issues? 
>  
> I understand that weight added farther out from the center has more 
> effect than weight close to the center.  Ideally, I would plan to make 
> a ring, with about an 11" OD (or as large as I can without interfering 
> with the starter ring), and about 7" ID.  This would bolt to the 
> redrive side of the dampener plate, using the existing 7/16" bolts.   
> I made an estimate of the weight of steel, by measuring the volume of 
> a 4130 plate, and weighing it.  The result was 4.5 oz per cu in.  My 
> best estimate is that I can get close to 10 lbs, using a half inch 
> thick piece of steel.  Unfortunately, this will be quite time 
> consuming, and tough to fabricate, balance, etc. 
>  
> The other option is to try to add more weight than I did before at the 
> 4 bolt locations.  This is a much easier plan to implement, but I'm 
> afraid I'll be lucky to get 5 lbs added using this method. 
>  
> Anyone want to take a swag at how well this would work? 
>  
> Thanks,
> Rusty (resistance is futile)

Rusty,

   How about one of the aluminum flywheels often
sold to racers?

Dale R.