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HelicopterGasser Model RC HelicoptersEngines › Motor bogging down and looses power at liftoff
06-22-2014 02:26 PM  3 years agoPost 1
mustang67ford

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Central Pennsylvania

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On my raptor 90 with a G240RC, my motor is about to die once i lift off. I have about 1.25 gallons of coleman fuel thru it. My needle settings are at about 1 3/16 low and 1 5/16 high. My throttle curve is 0/20/28/35/100. I hover at about 3/4 stick. The motor sounds great on the ground, but as soon as i lift off, the rpm's really drop and you can hear the rpms drop to the point it feels like it will stall. I am also no using a governor. I checked my temps and the motor head between the fins was probably about 150 degrees. Not sure what to do. I also am not using a governor.

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06-22-2014 03:48 PM  3 years agoPost 2
jackp332

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Claremont, Nh USA

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don't mean to ask a dumb question but has anything changed in your setup whatsoever? I remember just a few days ago you were commenting on how good it was running. it does not sound like it is going lean as 150 degrees is not that warm at all.. have you removed the plug and inspected it if so how does it look?

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06-22-2014 03:57 PM  3 years agoPost 3
mustang67ford

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Central Pennsylvania

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Yea, it had been good but i noticed it starting to loose power last week and really noticed it today. I pulled the plug and it looks good. Only change is i went to a softer damper.

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06-22-2014 04:45 PM  3 years agoPost 4
Chris Bergen

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cassopolis, MI USA

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Has the outside temperature changed recently?

Chris D. Bergen

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06-22-2014 04:52 PM  3 years agoPost 5
mustang67ford

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Central Pennsylvania

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Not a big temp change, but a little cooler this morning. Took my throttle curve up to 45% for the 4th point and it was much better.

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06-22-2014 04:52 PM  3 years agoPost 6
4 stroke flyer

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Dowagiac,MI

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try leaning your low needle just a little and see if that makes any difference. when mine runs rich it will do the same thing.

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06-22-2014 05:34 PM  3 years agoPost 7
USA_1_INK

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Moses Lake, Wa.

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I had the same trouble with my 290RC in my Goblin 700 . I try'd everything . I Talked to Carey Shurely about the problem . He suggested to change the carb and see if it goes away . I replaced the carb from one of my other 290's , and the trouble went away . Must have been something in one of the needles or something . I run coleman fuel as well with Amsoil Saber at 32 to 1 .
Something you might try .
Karl

Whiplash Gasser -Raptor X50F - Raptor 90se

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06-22-2014 06:01 PM  3 years agoPost 8
rhodesengr

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Pleasanton, CA USA

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do you have an aluminum aftermarket carb insulator? Engine dying on power can be sign of an air leak. I had something similar. I replaced the stock carb insulator with one of the after market ones. The Hanson and Toxic engines all come with one already.

Try the air leak test. Get a can of Dust Off (Freon), run the engine without blades and spray the Freon around the carb base. If the engine dies, you have an air leak. Just be careful not to spray so much that it goes in the main intake as that will also kill the engine and give you a false positive.

You can also try to tighten the carb mounting screws.

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06-22-2014 06:42 PM  3 years agoPost 9
mustang67ford

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Central Pennsylvania

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Thanks for the posts. Could it be that my throttle curve was just too low? My curve is now at 0/20/28/45/100 and it seemed better. Wouldn't the problem still be present even with a higher throttle setting? I don't have an aftermarket carb gasket.

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06-22-2014 11:10 PM  3 years agoPost 10
OuttaControl

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Springfield, Missouri -United states

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engine
My G260 in my Radikal was doing exactly the same thing. The fuel line came off the barb in the tank. Ran great after I fixed it. Just a thought.

Mine fall down, went BOOM!!

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06-22-2014 11:14 PM  3 years agoPost 11
raptornoob

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shrewsbury. ma. u.s.a.

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same poblem
got my predator back up from a bad crash,,,,the 231 runs and then dies or loses power..so i ordered a new carb and new spark plugs, the plug i pulled was all black, so i will se when it all comes in and i change them

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06-22-2014 11:32 PM  3 years agoPost 12
tyfast27

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Dubois, Wyoming

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Maybe you should try to fly it without the gov active just to eliminate it as the culprit. Just thinking out loud here....Did you run your throttle on the bench without the Heli running just to make sure its functioning properly? Sounds like its simply not getting fuel since its not even slightly hot.

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06-23-2014 03:45 AM  3 years agoPost 13
turboomni

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East of the Equator

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Maybe you should try to fly it without the gov active just to eliminate it as the culprit.
He said he wasn't using a gov at the moment. When did you stop using a gov or were you never using a gov? Is your temp of 150 normal or above or below normal when it was running well? And was it with a gov or not?

Setup is everything, All my heli's can fly far better than I can pilot them

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06-23-2014 05:29 PM  3 years agoPost 14
mustang67ford

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Central Pennsylvania

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never used a governor and never took a temp reading before.

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06-23-2014 05:41 PM  3 years agoPost 15
rhodesengr

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Pleasanton, CA USA

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did you test for air leaks yet?

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06-23-2014 05:59 PM  3 years agoPost 16
geomecc

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Long Island ,NY

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try this adjust your throttle curve so it's between 30 and 40 around half to 3/4 stick see if it makes a difference. then adjust ur carb so it's 1-1/4L and 1-3/8 to 1-1/2 H.and try again if it's still giving the same issue and you don't have an air leak on the carb side your muffler is plugged.

R I P Roman Jr. Team SKOOKUM SRW EFC

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06-24-2014 05:04 AM  3 years agoPost 17
mustang67ford

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Central Pennsylvania

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Thanks for the info. I didn't get a chance to check for air leaks yet. I did increase my throttle curve some as noted inmy previous post and it acted better. It seemed to do a lot better a couple weeks ago and i first noticed the loss of power when popping the heli up wih full collective. I noticed it loosing more and more power then this past weekend is when it really got bogged down just at liftoff. I have a hard time believeing it is a carb problem as it is a new motor. I will be getting some duster spray to do the air leak test though. I am assuming it be done at idle instead of remocing the blades and running the motor up? I will also adjust the needles some, but going to 1 1/4 and 1 3/8 would mean more loss of power as both would be richened up.

Also, here are 2 pics of my plug. Only a few tanks on this plug; plobably less than 1/4 gallon.

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06-24-2014 06:10 AM  3 years agoPost 18
rhodesengr

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Pleasanton, CA USA

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Idle or not you should certainly take take the blades off. I always take the blades off when doing any sort of bench engine testing. If I am standing next to it and running it, the blades come off, no exceptions. I hope you will do the same.

I did not need to run the engine up to detect the air leak. It was obvious even at idle. A small spray of freon on the carb insulator and the engine died.

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06-24-2014 06:06 PM  3 years agoPost 19
Markus

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Montreal

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How do the engine wizards out there judge the color of this plug,
reason I'm asking, I checked the plug of my hanson231 and it has the exact same color....

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06-24-2014 07:54 PM  3 years agoPost 20
Doug Darby

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Dallas, Texas

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plug
Hard to read from these photos.. use macro or zoom in on the ceramic under the electrode. In bright sun light helps..

doug

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HelicopterGasser Model RC HelicoptersEngines › Motor bogging down and looses power at liftoff
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