On 6/2/04 7:29 AM, "Steve Brooks" <steve@tsisp.com> wrote:

Rusty,
I had started with the stock Cozy cowling, and modified it for the rotary.  I left the original opening at the rear wide open to start with.  I figured that if cooling was good, I could start closing it off.  You can see the aft opening in the attached photo.  It is probably 2-3 times the sum of all 3 scoops.

Steve

Steve, one possibility is that the Ivo prop’s root section is creating back pressure in flight. Years ago some canard flyers did testing in flight and found there was reverse flow around the hub area. Ivo prop’s first 1/3section from the hub has very little pitch, and the faster you go, it acts more like flat disk.
Bulent