Over my head!
A 75 inch log that is 5 inches square
swinging at 7000 rpm??? If 191 HP can do that I will be surprised, but would
not want to be close enough to witness it! [:<O
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Andrew Martin
Sent: Saturday, September 25, 2010
11:56 AM
To: Rotary
motors in aircraft
Subject: [FlyRotary] simple dyno
Whilst researching propellers, I came across this gem of info from www.jcpropellerdesign.com
Gustave Eiffel (1832-1923) came up with a simple solution for measuring HP
without complex apparatus, By using a balanced
wood bar instead of a propeller with a square cross section of
1/15th of the length of the bar, you can measure the rpm and calculate the
HP available.
Power in HP = 0.0532 (diameter/450)5
(RPM/1000)3
As I need a load on the
engine when I run it I’m going to give this a go, 1350 x 90mm at 7000 rpm will
give me 191hp, that’ll do if I can get it.
--
Regards
Andrew Martin
Renesis RD1c