Guys, IVO did significantly increase the twist near the hub on the deep
pitch blades. The info Paul was refering to was on the low pitch version,
and is out of date. The IVO blade attachment system works fine, if
maintained, and not run on high torque reversing 4 cylinder engines. I went
200 mph during a short test (2 hrs on plane), but I was at only 5,000 rpm
and at 2,500'. I believe I could have gone faster, but the plane was
running out of elevator authority (wanted to climb). Cooling was okay, once
I got enough radiators. I've personally talked with a Lancair IV guy who
said that he's gone 235 mph with his IVO.

I'm not saying that an IVO is as good as an M/T or Hoffman, but for a
fourth the price, I'll give up 5% in performance. I certainly is better
overall than a fixed pitch for t/o and cruise. If you have the money, it's
your choice.
Chuck Harbert

We shall see if it is out of date when someone goes over 200 MPH
with an IVO prop (sans cuffs or large spinners) in any race where the 
speed can be independently verified.  

Lying seems to be endemic these last eight years. 

I am still waiting.

Paul Lamar
 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org