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Engine basics => Engine set up tips => Topic started by: RknRusty on November 10, 2013, 09:13:07 PM
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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
(http://i166.photobucket.com/albums/u116/rknrusty/Airplanes/mufflers_zps615180aa.jpg) (http://s166.photobucket.com/user/rknrusty/media/Airplanes/mufflers_zps615180aa.jpg.html)
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Beats me. There's a hint of Merco about it, but the splits in the wrong direction.
Could it be a nice home made job?
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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.
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Looks like an early O S Jet Stream, from back in the sixties to me..
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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.
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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.
(http://www.clstunt.com/htdocs/dc/user_files/23928.jpg)
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:
(http://stunthanger.com/smf/index.php?action=dlattach;topic=33042.0;attach=136726;image)
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I think you got it, Andrew, the top one in this picture. The weight is right too, about 50 grams. Thanks.
(http://www.clstunt.com/htdocs/dc/user_files/23928.jpg)
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:
(http://stunthanger.com/smf/index.php?action=dlattach;topic=33042.0;attach=136726;image)
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
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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
Ah well, too bad. But now that the mystery is solved I can probably pick up a 762 on eBay.
Someone pointed you out to me in the crowd at Huntersville. I meant to walk over and introduce myself, but got diverted elsewhere. Sorry I missed you.
Thanks for the reply,
Rusty
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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
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Juan, it looks nice and sleek on your plane. Perfect for planes that can't stand anymore nose weight.
Rusty
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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
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Kieth, that's what Gil thought too, but I'm pretty sure Andrew pegged it as an OS 762 with the fins ground off. I searched for one on eBay when I read that and had no luck finding one. I might post a classified when I get some hobby money to spend.
Rusty
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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.
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Yes, OS #762. I believe I have a couple of those in the shop, NIP, if anybody wants to buy them. The tailpipe is silly small. Can't say I've ever seen anybody use one, except Pete Peterson. His look a lot like yours, with no tailpipe, no fins, as light as possible, big hole where the tailpipe was. Very shiny! But he used them on Fox .35 Stunts and still uses them on DS .40's.
The Foxes all "blowed up", from 11,000+ launch rpm on his VERY competitive "Jamison's Favorite" aka "Special". The DS .40 runs exactly the same, same prop, 10.5 x 4.5 APC. It's muy noisy, with either engine! Except that the Foxes don't make noise anymore because the cranks all broke, including the Zoot one. Pete swore off Foxes. We're all to old to start a Fox .35 Hurling event. H^^ Steve
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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
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When using FOX 35s it is best to use wood props, the APC props and most all other nylon etc molded ones are too heavy for the motor, and Really Hi RPMs are not good when running FOX 35s
Randy