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Engine flame out on take off

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Old 02-23-2015, 08:30 AM
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Bigells
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Default Engine flame out on take off

Flame out on takeoff:
I have a Jet Central Cheetah mounted in a Comp ARF Euro sport. I have twin tanks feeding the engine through a header tank. At my last flying session the engine flamed out on the takeoff roll. I attempted two take offs and in both cases the results were the same.
During the startup sequence, the engine would start up and stabilize at idle rpm fine. I would then run the engine up to full power, I would do it twice, once slowly and then a slam execration. Both time while the plane/engine was stationary the engine worked fine. I would taxi it out, line up and advance the throttle to full power. The power would come up, the model would begin to accelerate and then I would hear a high wine as the engine shut down with white smoke coming out the back. There was no fire, just smoke. I cooled the engine down and recycled the power system for each attempt.
What was different about this situation from the rest of the time I had flown, was I had emptied the fuel tanks except the header tank. I wanted to get a better feel for how much fuel I was using for each flight. I emptied the tanks and filled them up and timed the procedure. So the next time I filled them and timed the fill, I could see how much fuel I put back. That is the only thing that is different as far as I can tell.
When the airplane is stationary the engine works fine, as it accelerates the engines shut down. Is this problem because I emptied the tanks and I have some sort of air trap which shifts position or really the fuel does and inhibits the flow and shuts the engine down. Have the clunks in the take been jammed forward and loose the pick up as the plane accelerates, I donít know. Any suggestion would help. I will check the clunks in the tank first.
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Old 02-23-2015, 10:20 AM
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Originally Posted by Bigels View Post
Flame out on takeoff:
I have a Jet Central Cheetah mounted in a Comp ARF Euro sport. I have twin tanks feeding the engine through a header tank. At my last flying session the engine flamed out on the takeoff roll. I attempted two take offs and in both cases the results were the same.
During the startup sequence, the engine would start up and stabilize at idle rpm fine. I would then run the engine up to full power, I would do it twice, once slowly and then a slam execration. Both time while the plane/engine was stationary the engine worked fine. I would taxi it out, line up and advance the throttle to full power. The power would come up, the model would begin to accelerate and then I would hear a high wine as the engine shut down with white smoke coming out the back. There was no fire, just smoke. I cooled the engine down and recycled the power system for each attempt.
What was different about this situation from the rest of the time I had flown, was I had emptied the fuel tanks except the header tank. I wanted to get a better feel for how much fuel I was using for each flight. I emptied the tanks and filled them up and timed the procedure. So the next time I filled them and timed the fill, I could see how much fuel I put back. That is the only thing that is different as far as I can tell.
When the airplane is stationary the engine works fine, as it accelerates the engines shut down. Is this problem because I emptied the tanks and I have some sort of air trap which shifts position or really the fuel does and inhibits the flow and shuts the engine down. Have the clunks in the take been jammed forward and loose the pick up as the plane accelerates, I donít know. Any suggestion would help. I will check the clunks in the tank first.
Steven,
I'll get in touch with Jose and ask him to give you a call. Jose is the Jet Central rep now and he can talk you through the issue. Hope all is well with you.
Paul
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Old 02-23-2015, 12:46 PM
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Bigells
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Paul...thank you very much. I hope things are going well at you new position.
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Old 02-23-2015, 01:11 PM
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You're welcome Steven. Yes, things are good here, just learning the new city. I talked to Jose and he will be responding to you concerning the Cheetah.
Take care,
Paul
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Old 02-23-2015, 03:08 PM
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rcjets12
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Originally Posted by Bigels View Post
Flame out on takeoff:
I have a Jet Central Cheetah mounted in a Comp ARF Euro sport. I have twin tanks feeding the engine through a header tank. At my last flying session the engine flamed out on the takeoff roll. I attempted two take offs and in both cases the results were the same.
During the startup sequence, the engine would start up and stabilize at idle rpm fine. I would then run the engine up to full power, I would do it twice, once slowly and then a slam execration. Both time while the plane/engine was stationary the engine worked fine. I would taxi it out, line up and advance the throttle to full power. The power would come up, the model would begin to accelerate and then I would hear a high wine as the engine shut down with white smoke coming out the back. There was no fire, just smoke. I cooled the engine down and recycled the power system for each attempt.
What was different about this situation from the rest of the time I had flown, was I had emptied the fuel tanks except the header tank. I wanted to get a better feel for how much fuel I was using for each flight. I emptied the tanks and filled them up and timed the procedure. So the next time I filled them and timed the fill, I could see how much fuel I put back. That is the only thing that is different as far as I can tell.
When the airplane is stationary the engine works fine, as it accelerates the engines shut down. Is this problem because I emptied the tanks and I have some sort of air trap which shifts position or really the fuel does and inhibits the flow and shuts the engine down. Have the clunks in the take been jammed forward and loose the pick up as the plane accelerates, I don’t know. Any suggestion would help. I will check the clunks in the tank first.
Hi Steve,

It sure sounds like you are getting an air bubble in your fuel lines. Any time you empty all your tanks including your UAT you should prime both lines and make sure you are not getting any air bubbles in any of your lines. Also once you do that then you want to start the engine and bring up to full throttle and make sure you don't have any air going through your fuel lines.

If if you have any further questions please feel to give me a call.
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Old 02-23-2015, 09:19 PM
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I was going to suggest check your clunks since it sounds like your getting air. Is the UAT full and is there any air in the line feeding the engine?
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