Doug;  We have the Ivo Magnum 72" three blade elect. w/constant speed module on RV6A 13B light weight rotors, turbo housings, Bruce Turrentein eng., have not flown yet but are makeing great power, so far up to 5900 RPM static w/low pitch, tied to PU truck, am still learning about EC2 & EM2 tuneing but very close to the good feeling of not being earthbound.  David R. Cook Lansing MI.
----- Original Message -----
From: DLOMHEIM@aol.com
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, October 4, 2010 11:57:59 PM
Subject: [FlyRotary] Sam Hodges Prop area comparison

Ed Wrote:

 

"When He put my 74x88 Performance Prop on he got as high as 6100 rpm one time but each time got at least 6000 rpm...".

 

Sam's prop actually measured 76 inches long (if I remember right) which is quite a bit longer than I would want to run on a nose gear equipped RV.  A 76" prop leaves very little clearance off the ground and will undoubtedly result in a considerable amount of blade tip erosion over time.  

 

If my IVO prop doesn't really work out I think I will give the CATO 3 blade version a try since there are quite a few RVers flying it and it will get the tips off the ground a bit more...at a cost of a couple knots of top end of course!

 

Doug Lomheim

RV-9A, FWF / Canopy

OK City