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HomeAircraftHelicopterGasser Model RC HelicoptersEngines › Muffler problem
08-21-2017 10:54 AM  15 months agoPost 1
Gazza

rrApprentice

Australia

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Hy all

Purchased 2 RJX mufflers for my Spectra G's , 1 flybared with a 231 Zenoah TRM engine the other Flybarless with 26 Zenoah Hanson engine , just wondering what do you Gasser guys do to stop the Muffler falling off in flight , when I fitted them I used lock washers under the bolts and did them tight then left them overnight , went flying next day got up into a hover and within 2 minutes off they come one was on the ground before I could land ...
Any suggestions are much appreciated ...

Cheers

Gary...

Melbourne Victoria

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08-21-2017 01:10 PM  15 months agoPost 2
Pistol Pete

rrProfessor

Seffner, FL

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Re-tighen when hot.

~~Enjoying the hobby one flight at a time~~

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08-21-2017 01:30 PM  15 months agoPost 3
Carey Shurley

rrElite Veteran

Orlando, FL - USA

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Pete is right,

Install the header/muffler bolts with a high temp RTV and let it dry

get the engine hot, carefully remove the muffler (its hot) and tighten the header bolts good and tight. Then reinstall the muffler. Check the muffler bolts occasionally when you are flying

if it still falls off, you've got a vibration issue either in the helicopter, in the tuning or in the engine.

Proprietor - Gas Powered Helicopters

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08-21-2017 02:21 PM  15 months agoPost 4
Eury

rrProfessor

Dover NH

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Nord lock washers are magical for things like this. Still tighten when hot, but even without doing that Nord Locks keep things tight.

Nick Crego

Citizen #0168

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08-21-2017 10:52 PM  15 months agoPost 5
fastflyer20

rrKey Veteran

N. Tonawanda, NY

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I had the same issue. I tried the other suggestions mentioned. Then I stumbled on this: clean surfaces well (scotch brite and wipe with solvent), apply a thin coat of Permatex ultra black, tighten up bolts on bench, let it set for a few hours and fly. The black sticks better to the metal than copper. Have not had one come loose in years.

Tom
CAUTION - my posts are based on my experiences, yours may be different.

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08-22-2017 08:47 AM  15 months agoPost 6
Gazza

rrApprentice

Australia

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Thank you for all replies will do as suggested , it happened to 2 models with the same muffler ...
Am eager to get the problem solved so I can fly ...

Cheers

Gary...

Melbourne Victoria

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