Andrew,
It will be interesting to see what results
you get. If you can’t get the 7K rpm, at least this will give you a
method to determine what HP you are actually producing. The various dyno
sheets I have seen suggest that the HP of the rotary is pretty linear with rpm,
with torque pretty flat from around 4K on out.
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Andrew Martin
Sent: Saturday, September 25, 2010
7:38 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: simple
dyno
Kely, Bill, George
I have the RD1-c gearbox so bar rpm will be 2456 if and only if I can
get there with my non-tuned intake & exhaust.
1350mm x 90mm is 53.15”x3.542”
72" and 75” is way too long, according to the spreadsheet
I’d be lucky to get 1300 prop rpm. the biggest I would attempt with the
Renesis is 1500x100mm or 59.055”x3.937”, I apologise for the
earlier confusion, I’m Australian and work best with metrics.
the calculation is over my head also, I just copied it from the
spreadsheet. it lost formatting in the copy paste, the 3 & 5 are power of.
X section = width.
Longer, thicker bars would only be useful if you wanted to plot hp at
lower rpm or could produce more Hp than I’m expecting. I just need a load
on the engine to run it, thought I may as well have something that gives a
result, whether it is accurate or not is immaterial, if changes to the engine
result in higher rpm= progress, lower rpm = regression.