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Tuning a mouse can muffler

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Tuning a mouse can muffler

Old 03-07-2010, 01:27 PM
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Default Tuning a mouse can muffler

I have some past experiance long long ago tuning a traditional type tuned pipe for max RPM and performance but I have never used a mouse can type muffler untill now.

I will be running OS.25 fx and Webra Speed 25 on mouse cans for Open B combat.

It appears that the one mouse can that I currently own can be adjusted for length much like a slide trombone you might say.

Can you guys give some guidance on a good starting length, what props to use for the OS .25fx and the Webra .25 speed and what RPM's should I be trying to obtain for these engines on the groudn with reccomended props.

I have been told I will have to launch the Webra on the rich side and let it "come on " the pipe/muffler" as the plane unloads in flight. Agree, disagree. I have also been told to switch to a remotely mounted needle valve with a fairly fine thread so I can get good neelde settings.

Old 03-07-2010, 01:44 PM
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Default RE: Tuning a mouse can muffler

What you heard was true!
As for the Combat Kan with an OS.25fx
MA 9x4 prop start by sliding the can until it touches the end of the pipe.
Back it off 1/8" start there and tach it. With 15% nitro use should be in the 18k range on the tach
If you can hold the plane in a cradle at wide open throttle you can tune the can with a rag by turning it in or out and check it with a tach.
Webra 25 some pilots trim the props a little to get them on the pipe with higher rpm. Again you may have to put in the cradle and tune the pipe.
Hope this helps

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