REFLECTOR: CS Prop, was Re: Rudder Flutter Fix (and CS props)

[Scott Derrick]

Chuck,

I think you've covered the bases.. 

There are no (in my mind) reasonably priced veteran CS props available 
for pushers in the +200HP category.

Its a drag to be sure.  You'd pay MT/Hoffman $15, 000 for a $5,000 
comparable tractor prop.

It's all supply and demand, and right now the demand for pushers is 
low..  Probably less than 5% of the experimental market.

Scott


Chuck Harbert wrote:
> Thanks guys for the info on speeds over Vne and the rudder flutter 
> experiences. It sounds like you want the rudder to be air loaded at all 
> times, so it can't start vibrating at high speeds. As Tim said "As long as 
> held rudder  pressure there was no
> flutter". I guess if you get rudder flutter, apply force on the rudder pedal 
> to stop it.
>
> I don't remember checking rudder toe-in (Alan's wings), but I will tomorrow.
>
> Chuck H
>
> p.s. I guess nobody is going to help me find a CS prop???
>
> I wrote:
>
> I've been trying to find a good, reliable, and reasonably priced (electric)
> CS prop and here's what I'm seeing:
>
> Aerocomposite-looks good, but spendy like MT/Hoffman $13K
>
> Vesta-new, but untested in pusher V's-Good price $6K (2 blade)-7K(3 blade)
>
> MT has had problems, but some people love thiers and others don't.
>
> MPS-under development, but price is $6K for 2 blade.
>
> I'd appreciate any additional info anybody has on these or other CS props
> that will work on a 200 hp IO360 Std RG. Thx.
>
> Chuck H
>
>
>
>
> --------------------
> This is interesting to hear, the manual on page 2-28 just under the figure
> 2-25, states to make the same measurement and to shoot for 1/2" to 1". I
> remembered this because I just installed my winglets last week. I set mine
> at 1". I'm glad I didn't try for the 1/2".
>
>
>
> Andy
>
>
>
> Are we mixing models here, or is it the same for all?
>
>
>
> Al
>
> ----- Original Message ----- 
>
>
>
> Duane suggested this:   Measure the distance from the middle of the leading
> edge on the winglet just above the wing to the other leading edge winglet.
> Then  measure from the trailing edge of one rudder to the other trailing
> edge of the opposite rudder. The distance between the trailing edge of the
> rudders needs to be at least one inch and not more than two inches greater
> that the winglet leading edge measurement.  Mine was less than a half inch.
> So because My ball is centered when I fly I need to shim out each rudder
> equally un till I get at least one inch greater than the leading edge
> measurement.  Both the top and the bottom of the rudder need support stops
> when moving the rudder out.    An interesting observation on my way home
> from Oshkosh. On a shallow decent I was doing about 205kts indicated and
> once again I felt the slighest flutter  in the left rudder When I looked out
> I could see the rudder fluttering  but only the top half of the rudder was
> doing it.  I had shimmed out the bottom but not the top and so I observed
> only the top vibrating.  Dwane had showed me at Oshkosh how the factory on
> their new demonstrator had been shimmed out on the top and bottom.  I am
> making these modifications and will report my findings when I have them. It
> may be a while before I test fly as I am still a little freaked out about
> going so fast. Every little bump I feel I think something is going baaaad.
> Pat I would appreciate knowing your measurements. You certainly can go fast
> without flutter.  Thanks for making the trip to compete.  I enjoyed meeting
> you and talking.    Tim Rhodenbaugh
>  
>
>
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