I have a nice little 1.5 ounce muffler that came with some extra pieces with a used TT .25 that I bought. I'm pretty sure it's not a TT muffler though. Now I use it on my OS fp35, and would like to have another one for my fp40, which has the same size exhaust.

Here is a picture, and the muffler I'm talking about is the one mounted on the engine. The bottom one is an OS muffler and weighs 2.5 ounces.

Rusty

I don't know what that muffler is, but the muffler that came on the Tower 40 was considerably lighter than the OS, and fits just fine.

Appears to be an OS 762 with the stinger cut off, and all of the cooling fins removed, after a leisurely trip across the buffing wheel.

I think you got it, Andrew, the top one in this picture. The weight is right too, about 50 grams. Thanks.


I also read in the "Frozen Engines" thread about a muffler that came from Randy Smith. I could look into one of those too. Here it is:

I still have many of my ultra lite tube mufflers for the  OS  25 FP and  LA, but none of the 40 ones, I do have some that fit the OS 40 46 SF SX  and many of the  SF clones

Randy

  
  Hello Rusty
             I had one of those in my OS.35FP lost it in tall grass. The guy I bought the engine from had cut the tail pipe to increase the outlet size. When I bought a PA.40 Merlin I noticed the ultralite mufflers and bought 2 from Randy, The only thing I didn`t like is that the outlet is straight back and you need to use a dubro exhaust deflector. Thats why I used an aluminum airconditioning connector and made a deflector that you see on the picture to keep most of the oil from the plane. I`m using it on a scratchbuilt P-51B With an OS.40FP. In the first picture of the plane you see the outlet is straight back before Modified it.the second shows the muffler with the aluminum exhaust deflector.

                                                                                                                  Juan

  Looks like an early O S Jet Stream, from back in the sixties to me..

It is about the right size of the OS Jet Stream mufflers.  However, the Jet Stream mufflers were two piece affairs, split on the vertical center line, held together with three small bolts.  An extension to adapt to the exhaust stack was also a separate piece.  Also, there was no angular offset as shown in the photo and it would be very difficult to actually offset the Jet Stream s the extension/adapter would not match up with either the muffler or the exhaust stack.

Keith

Its an OS 762 like everybody said.  I used to grind and polish mine down like that when I used those.  Willis Swindell and John Tate taught me to grind out the tailpipe to open up the muffler as well. 

Yes, OS #762. I believe I have a couple of those in the shop, NIP, if anybody wants to buy them. ....

Sure, Steve I'll buy one or two from you as soon as I get paid. I'll PM you for the price when the time comes. Thanks.

Rusty