Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Pitts Muffler for speed?

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Old 08-26-2007, 02:42 PM
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Isaac F
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Default Pitts Muffler for speed?

Heys guys, I have a Tucano with a Webra 50GT Speed. What Pitts muffler you recomend me that does not affect the engine perfomance?

Also, I am flying it wiith a APC 11 x 6 (Tach it at 12,300RPM with 10% nitro) and this thing fly SLOWWWWW[&o] What Size prop you recomend me in order that this thing go more faster?

THX,

Isaac

Here are some pics that I took with my Celular Phone

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Old 08-26-2007, 11:25 PM
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Flyboy Dave
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Default RE: Pitts Muffler for speed?

Isaac.... there is no such thing as a Pitts muffler for speed IMO. Spend the money
on a proper muffler, or a performance muffler.

FBD.
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Old 08-27-2007, 12:07 AM
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combatpigg
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Default RE: Pitts Muffler for speed?

You might see the most speed from running it with open exhaust and crankcase pressure. No muffler to slow the plane down. A Webra .50 can turn a 9x8 pretty good.
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Old 08-27-2007, 12:21 AM
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Razor-RCU
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Default RE: Pitts Muffler for speed?

Yeah Dave hit it.... use a 9x8 and you should be good- Maybe 10x7 if you wanna...

The Webra-50 is a DAMNED-FINE engine!

Beautiful bird by the way!!
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Old 08-27-2007, 09:00 AM
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bob27s
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Default RE: Pitts Muffler for speed?

only thing close to a speed PITTS muffler would be the Turbo-Jett muffler.....

gives about 2/3 of the boost the jett-stream, but also increase torque quite a bit.

I run one on my old (and I do mean old) SJ-46 engine --- in a P-51 mustang. Turns a 10x6 might well. But I fly this combination with a 12x4 prop ---- intentionally.... to help slow the plane down (surface/structure issues). Runs around 14,000 peak... launches around 13,500 if I read my tach correctly yesterday.

The webra 50 should respond very well to the turbo-jett. Trick is, its not your typical pitts muffler.. so actaully fitting it in a tight-fitting cowl can be tricky. As you can see here though, this is a VQ-51 ---- .40 size.... and I managed the install with just a few vent and cooling holes.

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Old 08-27-2007, 12:26 PM
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Isaac F
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Default RE: Pitts Muffler for speed?

I going to try it with a 10x7 APC prop to see what happend.

Whats the max RPM I can get safe from the webra 50GT Speed?

THC,

Isaac
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Old 08-27-2007, 01:02 PM
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Default RE: Pitts Muffler for speed?

With the tuned muffler, Id suggset propping it for the 15K rpm range
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