----- Original Message ----- From: "Bulent Aliev" <atlasyts@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Thursday, June 15, 2006 10:14 PM
Subject: [FlyRotary] Life without a turbo....

After working for a week on all the details I did tonight my first  run in NA mode.
Prop is  3 blade IVO Magnum 68" electric set for take off (fine pitch)
OAT 90F
Right off the box without any tuning made 4900 static (2260 prop)
I'm pleased, since the prop was ordered for my turbo setup. My turbo/ muffler does a very good job. The noise was very close to the one I  had with the turbo. I basically gutted the turbo and left only the  empty hot section on. Makes very compact and sturdy muffler, with  exhaust pointed exactly where I want it without modifications.
John Slade tells me this static RPM is sufficient for flight. I  wander what other people think? I can trim the prop also and get a  bit higher RPM. John is running 64" (same prop) with his turbo  application.
Buly
Buly

Buly, I have no experience with an IVO, but I do want to remind you that maximum static rpm does not NECESSARILY mean you are getting adequate thrust.  I recall one individual who concluded that maximum engine rpm = max thrust.  He reduce the pitch until he had maximum rpm, unfortunately the thrust was just enough to get him airborne, but not enough to accelerate to a safe speed.  He never gained altitude and  impacted a  cactus with fatal results.

If your prop is set up similar to John's then you have a comparison and assuming your bird is similar in weight, etc, then is probably Ok to fly. I'd do a few taxi test and if your acceleration feels strong then you are probably  generating good thrust.

Any other "prop" guys want to advise Buly.


Ed