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jhstarn(at)verizon.net
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 Posted: Wed Aug 16, 2006 7:43 pm Post subject: RV-List: Tail lifting during full power static test |
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Don't look now BUT Gummibear & I (and others) have been YELLING "Tie it down" & have someone (without glasses) hold the tail down for at least the past five years. Maybe we need to have re-runs of very important safety issues every 3 to 6 months. While on the subject: Do Not stomp on the brakes of ANY RV- conventional geared airplane at slow speed (walking/taxi speed). They WILL, not might, they WILL put their nose on the tarmac quicker than you can react. KABONG Do Not Archive it's already in there several times.
[quote] Subject: RV-List: Tail lifting during full power static test
Listers--We are close to flying our RV-6. On the airworthiness certificate application it requires the builder to state that "the powerplant installation has undergone at least one hour of ground operation at various speeds from idle to full power. . . ." Yesterday during the first full power static test holding brakes and with the stick full aft the tail came up on me. Because I was approaching full power gradually (being nervous about just this sort of possibility) I was able to quickly close the throttle before the prop hit the ground.
LeRoy Johnston in Ohio.
[b]
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jhstarn(at)verizon.net
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| Posted: Thu Aug 17, 2006 10:01 am Post subject: RV-List: Tail lifting during full power static test |
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During the first runup tests & subsequent "conditional inspection" ground run ups we anchor it down & I drape my 230# self over the tail of HRII N561FS so that Tom is not setting in a pogo stick. IF you don't remove your eyeglasses, not to worry, the prop blast with do it for you. As for end of the runway runups we DO NOT cycle the prop as part of pre-flight. N561FS has more than enough umph to get rolling & take off even if the prop is in cruise. Tom kinda likes the extra kick in the pants during the take off roll (Kinda like the AB on an F-4) when he cycles up the prop during the roll.
Runup the engine, cycle the prop with brakes locked = Varooom, big bite of air, ding, ding, thud....followed by a long silence...KABONG Do Not Archive.
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jhstarn(at)verizon.net
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| Posted: Thu Aug 17, 2006 11:00 pm Post subject: RV-List: Tail lifting during full power static test |
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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
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