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HomeAircraftHelicopterThunder TigerOther › Engine Mixture. Is it too lean?
07-15-2002 04:43 PM  16 years agoPost 1
Peter G


Runcorn, Cheshire, UK

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Flying a Raptor 50 with OS50 SX 10% coolpower, SAB 600 Main Blades. The only way I can get the heli to perform OK, is to have the main needle valve set at ONLY 3/4 turns out.
The book says to start at 2 turns out, that means mine is wound in a further11/4 tuns.
It doesnt appear to over heat until around 10 mins of fliying. But these settings are the only way I can get it to fly.
Does anyone else have this problem.
P.S I am using the muffler supplied with the 50 kit.
Peter G

07-15-2002 05:38 PM  16 years agoPost 2


Salladasburg, PA

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I talked with a guy about that yesterday....he installed 2 pieces of lexan, one on each side of the shroud, that extended farther down over the head. He was having problems with overheating and that seemed to correct the problem from what he told me. I havent flown the 50....this is just second hand info. He also ran 30% fuel with a CMP. The needle settings in the manual are only starting points for when the engine is new. They will end up being turned in quite a bit once the engine is broken in.

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07-15-2002 08:38 PM  16 years agoPost 3


Long Island NY

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I have a Raptor 50 with Os50 and the orginal 2 turns out is only for the first tank or two. I think I'm about a 1 1/4 turn out running 30%. Broken in these have tons of power in the raptor with incrediable verticle climb rates. I can fly all day in 90 deg heat and not over heat so I would guess you need a little more tuning if you are over heating after a tank of fuel.


07-15-2002 08:53 PM  16 years agoPost 4


Port Orchard, Washington

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Too rich on the bottom?
Check to make sure you are not running too rich on the bottom and causing the top end to be too lean.

Jason Stiffey
Fly Fast....Live Slow...

07-15-2002 10:08 PM  16 years agoPost 5

rrKey Veteran

Spring Hill, TN

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One thing I found on my Raptor 50. The needle was not screwing all the way in so it was actually more turns out then I thought on the initial break in adjustment. The motor just wasn't acting right. It appeared to be about 1 to 3/4 turns out before it would run properly which meant that after break-in, the needle would probably be about 3/4 turns out which isn't correct. I pulled the needle and lubed up the rubber o-ring, then it seated properly all the way in. Two turns out again and it ran correctly.

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