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1. 12:00 AM - Re: RV-List: Tail lifting during full power static test (JOHN STARN)
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| Subject: | Re: RV-List: Tail lifting during full power static test |
60# in the baggage compartment (tied down of course) vs 230# at a much
longer moment. BUT your right the rope (we use a chain) could break, the
tie down could fail BUT not even our Rocket is going to lift an
additional 230# because at the first "forward" motion the power would be
at an idle.
Chuck Wentworth's TBM could but that's another story.
We "normally" have a third person standing in full view of the test
pilot and the "ballast". As the power slowly comes up, the third person
is watching the "ballast" ( who moves his head up & down YES to continue
or side to side NO to stop) & the tail wheel, anything happens & the
test pilot gets the slash, cut throat signal. Nothing is absolute,
(except death & taxes) 100% fool proof but we believe that our method is
well within the acceptable area of risk. BUT your mileage may vary.
You would be surprised how many helping, knowledgeable people gather
when we do a test runup. KABONG. Do Not Archive
----- Original Message -----
From: JhnstnIII@aol.com
To: rv-list@matronics.com
Sent: Thursday, August 17, 2006 8:27 PM
Subject: Re: RV-List: Tail lifting during full power static test
"Did you're engine supplier not run your engine in the test
stand before delivering it to you ? It should be marked in the
log book, I think. I.E. do you really need to run it for a
whole hour ? Aerosport ran my engine for a total of 45 mins
before it was delivered - so apart from a short short "shake
down" run and some taxi tests - its next run will be the wild
blue yonder."
It was run at the factory, but now it is installed in a new airplane
with new fuel lines, engine mount, exhaust system, etc. I would not
have felt comfortable signing the form without running it in its current
installation and knowing it would go to full power in takeoff/climb
attitude.
Re the question of how to tie down the tail securely, all I can say is
I used an airport tie down that looked solidly anchored with a rope in
good condition. I tied it around the tail spring with three loops and
two half hitches. I also added about 60 pounds to the baggage
compartment.
I would not want anyone hanging on the fuselage as some have
mentioned. That sounds like asking for trouble.
LeRoy Johnston in Ohio.
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