Subject: Extended PSRU
From: ACRE
Date: 7/14/2003, 8:59 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

   Yes I have made an automatic trim with an air cylinder that
operates off the air pump from the landing gear, when full throttle
is applied the nose comes up to 200 fpm climb instead of going into a
nose dive.

  Ken


There you go you canard people.... the best of both worlds.
Way to go Ken.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.