Bill,
I believe a std. transmission flywheel, or a torque converter full of
fluid will have significantly more mass than the psru adapter.  I ran my
20b w/o a prop for about 9 hrs total, but was very careful not to
over-rev it.  Throttle response is fantastic.  ;-)

Mark S.  -----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of bbradburry@allvantage.com
Sent: Tuesday, October 25, 2005 7:44 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Its a start!

Snip!
Running without a prop is a bit risky - overrev can happen suddenly.
Snip!

I don't understand how this is true...The engine has everything attached
that it has when it is installed in a car.  It should run fine with just
the
flywheel...adding the PSRU would be similar to turning the clutch and
front
half of the tranny...????

Please explain.

Bill Bradburry


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