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HomeRC & Power✈️Aircraft🚁HelicopterEngines Plugs Mufflers Fuel › anyone know what would cause this?
07-27-2012 01:43 AM  8 years ago
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Dan Minick

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anyone know what would cause this?
hey there guys. tonight i was flying my N5C around, i came out of a big loop and the engine flamed out! luckily iv been getting better with my autos lately the rest of the heli escaped unharmed but the pipe is a goner. im running a 55hz with a hatori pipe, 30% rotor rage. i cant really see any reason for this to happen other than age. second question, whats the best pipe, in your opinion, for my 55hz? iv been happy with this setup but if there is something better i may as well consider it. Thanks Dan

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07-27-2012 02:57 AM  8 years ago
dkshema

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Cedar Rapids, IA

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A long lever arm that is unsupported and subjected to heat and repeated vibration. Would suggest metal fatigue.-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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07-27-2012 03:11 AM  8 years ago
dchekas

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Farmington, CT

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Hatori I believe has a 2 year warranty.

Contact them, and I'm sure they'll send you a replacement.
Team Align, Team Futaba, Team Byron Fuels, Team Thunder Power
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07-27-2012 03:18 AM  8 years ago
balsapro

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Gallatin,TN

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Would suggest metal fatigue.
I concur... had a muscle pipe do that to me once
Build the Best, Fly the Best, Crash the Best
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07-27-2012 03:26 AM  8 years ago
GREYEAGLE

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Flat Land's

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DK has it exactley right : Usually -
It start's at the weld, with a inclusion in the two dissimilar materials " The Tube and the Machined Flange" even if the alloy's are pretty close.

Some time's their maybe a third alloy component - dependent on the welding process used to combine the two .

From the inclusion - It begins as a micro propagating crack which will run dependent on the fatigue.

Here's a pic of one of mine although not a weld failure you can plainly see the crack.

greyeagle
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07-27-2012 03:53 AM  8 years ago
baby uh1

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St. James, Mo.

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So, do you think that the pipe broke and caused the flame out or that it broke on the landing? It would make sense that it broke in flight and caused the engine to quit.
I hear that the TT pipe is good on the 55.
Anything is possible if you don't know what you are talking about!
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07-27-2012 04:15 AM  8 years ago
Dan Minick

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Columbus, WI

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I believe this is what caused the flame out. Though I cannot prove it I guess. I can't imagine this happened on landing and my gear didn't even break
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07-27-2012 12:11 PM  8 years ago
bart2546

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Canal Winchester, OH - USA

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I would agree with everyones responsea above and also the 55 has GREAT tuning, sound, and ability with the Funtech B320 pipe. I switched to that from an Outrage 55 pipe and it was 180 degree difference.Regards, Brandon Bartolomucci; Team Synergy; Team Scorpion; & Team Bavarian Demon; AMA# L939231
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07-27-2012 03:56 PM  8 years ago
dkshema

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Cedar Rapids, IA

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Since you were running an engine and depending upon muffler exhaust pressure back into the tank to improve your overall engine performance, the needles are set with respect to having a pressurized tank.

If you should suddenly lose your muffler (or have a good sized hole open up unexpectedly), that pressure goes away and you begin running at ambient pressure.

The net result is that your engine will go lean. If you fail to throttle back to get the mixture richer, and find a place to land, the motor will most likely and quickly, die lean.

I've had this happen in planks, when flying an OS engine with the two-piece muffler, whose halves are held together by a long bolt running through the center from front to back. The bolt breaks, the rear end of the muffler falls off and usually results in a flame out, unless I can manage to throttle down before the motor quits.

Had you been using a YS motor, or one of the OS engines with the demand regulator, you would have continued to be able to fly, but things would have been noticeably louder all of a sudden!
-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz
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