----- Original Message -----

From: Haywire

To: Rotary motors in aircraft

Sent: Monday, August 04, 2003 4:36 AM

Subject: [FlyRotary] Tachs other stuff

Hi Rusty & All;

  SNIP

 

.

    What should I expect for a static RPM with a 76" 3 blade prop set at approx. mid range (60"). I can get 5000 RPM with about 2-3psi boost. This is not quite full throttle, but I don't really want to boost much at this altitude as I'm running the 9.4:1 rotors. Also the plane starts dragging at this, so I don't really want to push it any harder. Reading the archives I find Ed reports a static of 5200-5400 RPM, but that's a 2 blade ( ? X ? ). Tommy reported 4350 RPM with a 3 blade ( ? X 60) @30"MAP.

S. Todd Bartrim
Turbo 13B RV-9Endurance
C-FSTB
http://www3.telus.net/haywire/RV-9/C-FSTB.htm

   "Whatever you vividly imagine, Ardently desire, Sincerely believe in, Enthusiastically act upon, Must inevitably come to pass".

Todd, my prop is a 68x72 two blade if that helps.  Tracy Crook has the same prop and gets static rpm in the same range as I do 5200-5400 rpm

 

Ed Anderson