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HelicopterBeginners Corner › engine bogging
11-29-2007 09:56 AM  10 years agoPost 1
mustang92

rrNovice

sterling, virginia

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i went by the manufacturers standard instruction of 1 1/2 turns out from full in with the mixture needle. i flew the helicopter for a little while and then once i started trying to get it off the ground, as soon as any load was put on it the engine would slowly bog down and die. i tried richening it up little by little but it helped nothing, thinking it was too lean and maybe was getting too hot. i don't have any idea what to do with it? also what is the optimum nitro percentage to run in a raptor 30 size? does the higher the percentage the hotter it burns or what? THANKS!!!

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11-29-2007 10:18 AM  10 years agoPost 2
RappyTappy

rrProfessor

North Denver, Colorado

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Need a lot more info than that. What engine manuf. OS or TT or what, what muffler, new or used engine, what % are you using(15 to 30% is fine with full synthetic oil), was there sufficient smoke when you were flying before it lost power? I'm taking a guess is maybe it was lean and overheated causing the problem you are having. If that was the case you may have damaged the ring, piston or liner which would cause a loss of compression and no power, adjusting the carb in that case would not provide any help.

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11-29-2007 11:36 AM  10 years agoPost 3
mustang92

rrNovice

sterling, virginia

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It is an A.S.P. engine, and i bought the helicopter about 2 months ago (used) and i believe it is the factory engine with the thunder tiger raptor 30, but not sure?! it has an after market exhaust on it but i'm not sure of the manufacturer. I am using 25% nitro. and no there has never been sufficient smoke coming from it. i was wondering about that since the first time i ever ran it. so the first few times i flew it i turned the needle 2 1/2 to 3 turns out and still not much smoke. the engine has always been hard to get to full throttle. when you turn it up slowly or quickly it boggs out and dies most of the time but will sometimes make it up in throttle quickly. is that normal? if not, is it a sign of to lean or too rich? and at this point do you think i need to just go ahead and invest in a new engine? if so what is the one that you would most highly reccomend? thanks for all of your help!

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11-29-2007 12:00 PM  10 years agoPost 4
airdodger

rrElite Veteran

Johnston USA

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Os 37 is a good choice.

Chris

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11-29-2007 12:05 PM  10 years agoPost 5
Way2slow

rrVeteran

Jeffersonville Ga

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I just went through the same thing with my OS 50 Hyper and I was running too much pitch curve for my throttle curve at the 75% range. I increased my throttle curve and backed my pitch curve down a little and it comes up smoothly now.

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11-29-2007 01:23 PM  10 years agoPost 6
jbiter

rrKey Veteran

Sebring, FL

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Os 37 is a good choice.
A gentleman at our club once asked me how come helicopter pilots always use OS or YS engines in their helis. My answer was that we needed them to run reliably and would not tolerate a finicky engine.

The OS37 or even a good used 32 is a good option. Sell the ASP to one of your plank friends

Jeff

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11-29-2007 07:08 PM  10 years agoPost 7
RappyTappy

rrProfessor

North Denver, Colorado

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Before ditching the motor, make sure all the basics are ok. Make sure all fuel lines are ok(change em if they're old), the tank doesn't have any leaks(Raptor tanks can be prone to this as the nubs on the fuel tank rub on the frame).

A leak in the fuel system will produce the same symptoms of lean runs and make mixture adjustment near non-functional. Also, as mentioned before, make sure your pitch is approx 5 to 6 degrees at half stick hover and about 50% throttle and they both simultaneously go smoothly to the set positions without speeding up or slowing down any along the way.

If all is set as above and looks correct and it still is not running reliably, getting hot when it is running even with a rich needle setting, then the engine has more than likely seen its day.

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12-01-2007 09:02 PM  10 years agoPost 8
A. Gordon

rrApprentice

Farnham,Va.-USA

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Another thing to check is the O-ring on the high speed needle along with the above mentioned. If the the needle feels loose with side to side play the O-ring could be the culpret. It will cause it to run inconsistantlty. Just a thought.

All for the spectators!!

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12-01-2007 09:54 PM  10 years agoPost 9
RappyTappy

rrProfessor

North Denver, Colorado

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Yep, that would be classified as a leak in the fuel system as well.

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