Subject: Extended PSRU
From: ACRE
Date: 7/14/2003, 7:36 PM


 > > > > >Unless you are willing to accept a smaller diameter prop or go with
 much longer gear then this will cause real issues with
 > > > >rotation at takeoff and prop strikes on landings
 > > > >...Chrissi
 > > >
 > > > Yes we know that. Longer fixed gear is not that big of a modification.
 > > > Would also improve prop efficiency on tractors.

 > > I was under the impression this discussion was applied to Pushers,
 extending fixed gear in a pusher is not an option, the bow is
 > > a custom item made up in molds.
 > > ...Chrissi
 >
 > Make a new mold or have the gear bent up out of aluminum plate.
 > There is an outfit that will do that for you. Since the modulas of
 > elasticity is higher it will make a better gear anyway. Not only
 > that it won't melt from brake heat as the stock fiberglass gear
 > is won't to do.
 >
 > Paul Lamar

Vance W Jaqua wrote:

 This is where a reduction drive with offset from the engine centerline
 provides a benefit, Each inch of offset buys you two inches of prop
 diameter. - (Gee! would this make an EZ in side profile look like
 the famous BD5?)    :)   - Vance


Good idea. Get one of Ken's tried and true 3:1 cog belt reduction
units and have
Ken lengthen the output shaft by about a foot. Ken could use
something like this four
inch output shaft without the planetary to stiffen the output shaft
in torsion.

That will make one hell of a pusher PSRU. Could help with the
prop-in-wing-wake
problem.

Paul Lamar


   I make many ratios and offsets and can make custom offsets if
needed, check out my web page for all the specs.

  Ken Welter
  http://homepage.mac.com/rotarycoot/

Maybe you weenie canard pilots have never flown a Coot :) Talk about pitch
change! Right Ken? 

Paul Lamar

 
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