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Date: Sat, 25 Sep 2010 23:56:16 +0800
Message-ID: <AANLkTimvrOgw9vQ8A4RsmHiRGq-ryvKu8b759k2r5dgS@mail.gmail.com>
Subject: simple dyno
From: Andrew Martin <andrew@martinag.com.au>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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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 =3D 0.0532 (diameter/450)5 (RPM/1000)3

As I need a load on the engine when I run it I=92m going to give this a go,
1350 x 90mm at 7000 rpm will give me 191hp, that=92ll do if I can get it.
--=20
Regards

Andrew Martin
Renesis RD1c
West Australia

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Whilst researching propellers, I came across this gem of info from <a href=
=3D"http://www.jcpropellerdesign.com" target=3D"_blank">www.jcpropellerdesi=
gn.com</a><div><br clear=3D"all">Gustave Eiffel (1832-1923) came up with a =
simple solution for measuring HP without complex apparatus, By using a <i>b=
alanced </i>wood bar instead of a propeller with a square cross section of =
1/15th=A0of the length of the bar, you can measure the rpm and calculate th=
e HP available.</div>

<div>Power in HP =3D 0.0532 (diameter/450)<span class=3D"Apple-style-span" =
style=3D"font-size: x-small;">5</span> (RPM/1000)<span class=3D"Apple-style=
-span" style=3D"font-size: x-small;">3</span></div><div><span class=3D"Appl=
e-style-span" style=3D"font-size: x-small;"><br>
</span></div><div><span class=3D"Apple-style-span" style=3D"font-size: x-sm=
all;"><span class=3D"Apple-style-span" style=3D"font-size: small;">As I nee=
d a load on the engine when I run it I=92m going to give this a go, 1350 x =
90mm at 7000 rpm will give me 191hp, that=92ll do if I can get it.</span><b=
r>
</span>-- <br>Regards<br><br>Andrew Martin<br>Renesis RD1c

</div><div>West Australia</div>

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