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HelicopterEngines Plugs Mufflers Fuel › OS 37 Muffler Options?
10-25-2004 04:01 AM  13 years agoPost 1
wheelnet1

rrApprentice

Flower Mound Tx

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I’m flying a Caliber 30 w/OS 37 and the FT canopy. I’m still using the stock muffler which worked fine on the OS32 but on the 37…. Not so much. Anyway I’m looking to replace the stock muffler something optimized for the 37. I’ve narrowed it down to the Hatori 415, the Toki-H40 muffler and maybe the MP2Q. The Zimmerman and SAB-6RS won’t fit under the FT canopy. Any observations or recommendations would be appreciated as always. Thanks.


http://www.skylinemodels.co.uk/acat...d_Mufflers.html

http://www.modelrec.com/products/rc...gory=Two Stroke

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T-Rex 700LE Align 91H-R, T-Rex 600 Nitro Pro-O.S.50 Hyper

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10-25-2004 03:19 PM  13 years agoPost 2
janked

rrApprentice

Spokane, WA

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Try the Hatori SAB-6RS Muff. Raptor/Sceadu OS.37 from Heliproz. It's a bit pricy, but it works great with my 37. It was specifically designed for the OS 37 and higher nitro fuels. I was told the 415 was designed to accomodate the lower nitro fuels that are more common in many places around the world.

David

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10-25-2004 09:35 PM  13 years agoPost 3
rckrzy1

rrElite Veteran

Hurst Texas

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I've been shocked. My TT39 stock muffler is working great. Still very rich as I only have 6 tanks but pulling 550's at 11 degrees with NO loss
of 1650 headspeed. The climbout is great. Temps under head at 140-150F.



Wildcat Fuels

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10-25-2004 09:47 PM  13 years agoPost 4
Wally

rrVeteran

San Diego, CA

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I've been running the .50-sized Mavrikk from Heliproz.

The Big Wally

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10-25-2004 10:49 PM  13 years agoPost 5
rob10000

rrKey Veteran

Western​Massachusettes

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isn't the spacing on the .37's muffler mounting holes the same as on the .32 at 35mm? How are you getting the 50's muffler to fit @37mm?

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10-26-2004 01:19 AM  13 years agoPost 6
TMoore

rrMaster

Cookeville, TN

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isn't the spacing on the .37's muffler mounting holes the same as on the .32 at 35mm? How are you getting the 50's muffler to fit @37mm
The spacing is the same but what you do is drill out one tapped hole and use a bolt and nut on it. Here is the rub. The TT 50 muffler isn't as long as the KSJ 30 Competition muffler but the TT 50 muffler fits better as you only have to drill out one hole to make it work. The KSJ will foul the throttle arm so you have to be careful to work that out, the KSJ doesn't fit too well in the FT canopy and in my case I had to machine a tapered spacer to angle the muffler away from the Caliber tank and still clear the throttle arm. The KSJ has more volume than the TT by probably 7-10%, maybe. Volume is what makes the 37 cook.

We have a Toki muffler coming here to test and make sure it will fit properly without a spacer and still go under the FT Canopy. Like I said, the 37 thrives on volume to help extract the exhaust gases. In my case the KSJ added 100 rpm to the head speed and makes the Caliber sound like a 50 or 60 size machine. The little machine really has some nads with the KSJ muffler.

Terry

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