Ken, this may not apply to you but I have a Whirlwind constant speed
prop with a Jihostra hydraulic prop governor. If my engine oil is not
fully warmed up, the prop governor will not hold a constant pitch.
Rather, it will change pitch back and forth causing an RPM surge up and
down. If the oil is at normal operating temperatures, no problem. It's
a long shot, but this may apply to you. Good luck sorting this out.
Garry Stout
914 Tri, Tampa Florida
----- Original Message -----
From: kbcarpenter@comcast.net
To: europa-list@matronics.com
Sent: Sunday, May 06, 2007 11:04 AM
Subject: Re: Europa-List: surging engine on take-off
The fuel pressure was constant around 24 with both pumps on. The
hoses look attached and in good shape. The throttle lines are as they
have been for four years and 430 hours. I do not have a stop for the
100 percent power but have a manifold guage which I did not look at.
It puzzles me that the ground run-up did not reproduce the surg.
ken
-------------- Original message --------------
From: Gilles Thesee <Gilles.Thesee@ac-grenoble.fr>
>
> ken carpenter a =E9crit :
> > Yesterday taking off, the engine surged as the turbo kicked in
it went
> > up to 5700 RPM then dropped back into the 4800 range. I tried
several
> > runs but aborted the take-off as it continues to surge. Checked
the
> > prop governor and it checked out as functioning correctly.; Took
the
> > cowl off and the turbo arm seems to cycle correctly when the
master
> > turned on and the throttle cycled. Tied the plane down and ran
it up
> > to 5700 rpm. It did not surge at all.
> > Any idea? I have not tried to fly it again yet.
>
> Ken,
>
> Of course ======
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