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Start valve air leak
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mark.bitterlich(at)navy.m
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PostPosted: Tue Jan 22, 2019 10:41 am    Post subject: Start valve air leak Reply with quote

Starting these engines with no one in the cockpit does indeed work. I've got a wrecked YAK-50 in my hangar that proves it can be done. Guy left the air valve open and it leaked all the air out. He then hand propped it with no one in the cockpit, it started, rolled over chocks, and away it went. At speed. About the time it was ready to fly, a big hangar got in the way. I got it from the salvage yard. One wing tore right off.

A Sukhoi was accidentally started the same way. Pulling the prop through with one P lead disconnected. Prop hit the guy. He survived.

Turning the air valve off? I've started my 50 with the air valve closed more than once. Residual air will do it, if it is primed correctly. There's another fellow on this list that did that too. In my case, I did not realize it until I took off and saw that the gear did not come up and lock. They UNLOCKED, but just hung there dangling. Dumb move huh? Yep, it was. I got lucky.

All that being said, I did use that lever once to start the 50 that I fly. Rigged up a pulley and some parachute cord and yanked the cord from the cockpit to open the starter valve (which had a burnt out solenoid) while hitting the start button to energizer the starter coil while I was in the cockpit. Easy to do in a 50, but in a 52, somewhat harder.

Mark
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cjpilot710(at)aol.com
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PostPosted: Tue Jan 22, 2019 7:45 pm    Post subject: Start valve air leak Reply with quote

Been there done just like Mark. Will had one thing. If you have an alternator (instead of a generator). With a battery, you MAY be able to get the engine started without the starter coil BUT once started because of the dead battery you'll get no juice to excite your alternator. So no electrics. Jim "Pappy" Goolsby


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