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Old 08-09-2006, 07:37 AM   #1
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Muffler Troubles

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I have a FuntanaS 40 with a saito 82. The muffler on the saito is constantly coming loose. With out exaduration it must come loose at least 50% of flights and i'm wondering if anyone has had the same problem or has heard of how to stop mufflers from loosening. I would like to find out if there is a paste, high temperature locktite, or anything else i can put on the threads to stop this problem.

Also what prop should i be using for 3D? Right now im spinning a 15 x 4 wide.
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Old 08-09-2006, 07:56 AM   #2
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Hi Steve,

The compound you need is Loctite 620 retaining compound, looks like green snot. It's a high temp, gap filling thread locker.

Saitos are HORRIBLE for loosing their mufflers. I have a 56 and I'm on my 3rd muffler. You're going to have to look closely at the threads on the pipe (nice strong steel) make sure the threads are nice and pointed (like so ^) if not replace the pipe. Look also at the muffler itself (some cheap crappy light metal) I've had a muffler actually stretch out and the opening for the pipe to go into, go oval. The threads again, should be nice and pointed, if not replace it.
If the threads are good put a couple of drops of the 620 on the threads and tighten that muffler and the backing nut on good and tight. Don't go bananas, you might strip it out, but definitely go tighter than just snug.

Chris Rebidoux
Gravity works. I've tested it......often!!!
Building: Jerry Bates 1/4 Chipmunk
Vancouver Vanguard 1/6 Fairey Firefly
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Old 08-09-2006, 08:07 AM   #3
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Thanks i will definately try that i have a new muffler i got sent from horizon so ill go get some locktite and see how it works
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Old 08-09-2006, 08:54 AM   #4
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what i use is teflon plumbers tape ,it wont be effected buy the heat and acts the same way a plastic thread lock nut would

if it comes loose it wont spin out and go missing

theres no place,like cloud base!
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Old 08-09-2006, 08:57 AM   #5
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I use red loctite and snug averything real tight. I've got lots of saitos. They all will loosen without loctite.
John Kovats

aka Johnny Versatile

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Hespeler Model Aviators Inc.
Cambridge Float Flyers

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Old 08-09-2006, 10:32 AM   #6
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I'm willing to bet that the old hose-clamp style of keeping a muffler on won't work
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Old 08-10-2006, 08:17 AM   #7
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Your 15x4 might be a bit big try a 14x4 and see how much rpm on the ground compared to the 15.

I have found it helps to tighten muffler when its hot.
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