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Old 05-23-2006 | 05:35 AM
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Silver182
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From: Littleton, CO
Default RE: PCM Lockout question

ORIGINAL: icepilot

Raf,
I was flying my Simjet 300 powered SpiderJets F-16 during an extremely cold jet meeting here in Norway this winter. I was setting up for a landing because I was freezing my nails off, at the same time a friend of mine landed his Merlin powered Eurofighter and taxied by me. With the noise from his turbine, I was unaware of the fact that I had a flameout on finals, and proceeded like I had a running turbine with 25-30% power.

The plane just came to a complete stop in the air approx. 50 feet up, and fell straight to the ground with the wheels out. The "landing" caused the wheels, legs, retracts and formers to brake off, and the flex in this moment caused the plane to bounce maybe 15 feet up again. The amazing thing was that there was very little structural damage to the plane, and all internal components were completely unharmed.

I had almost 1 litre of fuel left, and the weight during the crash would have been about 13 kg. We are talking about a serious impact here, but the fact that it pancaked on the runway and the wheels, legs and retract formers broke away propably saved it!

Afterwards, I was thinking about my failsafe settings and wondering whether to set it to turbine idle, wheels out and full up elevator to try and reduce speed and hope for a loop or two and a pancake crash instead of the rather optimistic slight elevator, slight turn hoping that the plane would land itself if control is lost. After all, if you loose control and the plane goes up in a tight loop. it would be much easier to regain control than if you snaproll it.

Here are a couple of pictures - a flyby and falling out of the sky! Notice the elevators going down!! Heard of the bent stick??!!
Figuring out the best fail-safe setup to save your airplane, or save people on the ground are two totally different things. The fail-safe setup I am talking about is the ultimate one HOW DO WE NOT HIT SOMEONE ON THE GROUND! Any combination of Hold...slight up elev., etc., etc. is a fail-safe to try and save the airplane!

The snap-roll setting is one designed to get the airplane out of the air ASAP when a total R/F link failure occurs... and that's the one that can never be predicted. Icepilot go take a look at the video of the airshow crash a few day ago.. RCU sticky thread "Safety Matters" you'll then better understand why in my opinion at this time we only have one choice for the safest fail-safe setup.... the snap-roll. A parachute fail-safe is only a dream.... one that might be safer for airplane & people at the same time.
Lee H. DeMary
AMA 36099