RCU Forums - View Single Post - Inside cowl muffler
View Single Post
Old 01-19-2007, 10:09 AM
  #10  
da Rock
Senior Member
 
Join Date: Oct 2005
Location: Near Pfafftown NC
Posts: 11,517
Likes: 0
Received 2 Likes on 2 Posts
Default RE: Inside cowl muffler

I've got the same deal with my H9 Thunderbolt. I plan to use an OS91FX and it's muffler is basically a 61FX muffler that's got a 1.5" extension in the middle of it. It's looonggg.

I'm going to have to put a hole in the firewall AND the next bulkhead AND make room in the belly pan that's glued to the wing.

I plan to protect the inside of the fuselage with a tube that runs from the firewall hole to the bulkhead hole. I figure to use cardboard tube, like from inside a roll of toiletpaper. It's light and a coat of finishing resin will make it fuelproof. The diameter isn't quite enough, but that's easily taken care of.

The muffler will have to be sealed from the inside of the fuselage for sure. They always leak.

I'm not worried about the heat. Given at least 1/4" clearance all around the muffler and the air flowing through ought to be enough. And I'll probably have a layer of glass cloth around the toiletpaper tube.