Date: Mon, 14 Jan 2002 09:52:09 -0500
From: James Frantz <LFrantz@compuserve.com>
Subject: What to do with all that HP information.
Sender: James Frantz <LFrantz@compuserve.com>
To: "INTERNET:lancair.list@olsusa.com" <lancair.list@olsusa.com>
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>>
Have you been wondering how the HP discussion helps us build, fly or
maintain our aircraft better?  The following is my contribution.

1.  Tie the tail  of your new aircraft to a hitch.
2.  Measure the shortest distance between each main wheel and the center =
of
rotation of the prop . =

3.  Put a scale under each main wheel and note the weight normal to the
center of rotation.  =

4.  Start the engine and Firewall the throttle. =

5.  Measure the weight on each wheel again.
6.  Try not to let that beauty get away all by its self.  =


With all the previous discussions of the relationship between torque and
HP, we can now easily compute something useful like torque (from reading
the scales), HP (if you noted how fast the prop was rotating) and
propulsion efficiency (if you knew the rated HP of the engine at the prop=
).

Over time a re-test would determine if the engine and prop are still up t=
o
par.  Perhaps a bit of a stretch but we actually did this once here in in=

Minnesota  when fishing season was closed and there wasn't anything else
better to do.

Jim Frantz =

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Please send your photos and drawings to marvkaye@olsusa.com.
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