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

pusher muffler - a few photos

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Old 09-12-2007, 09:26 AM
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bob27s
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Default pusher muffler - a few photos

Several folks have asked for something like this since the Bobcat came out.....

So few metal shavings and a little R&D later..... volia !

Shown here mounted on an OS55AX. (best prop on that combo is an 11x6 or a clipped 11x7P)
11x6 turns 14,700+ ground peak - tendency toward the + side.
Idea is to prop it for "over" 14,500 ground peak. A stock 11x7 is too much. Need more data on the 11x7P.
On a .46 or .50 you would want it turning a 10x7 or 10x6P - likely well over 15K rpm.

Muffler is the 46 size... and like its counter part is good for all of the .46-.55 size engines.
I belive Dub intends to have this available for the 60LX as well for pusher use. And eventually the 90 size will be available too.

I have to double check, but the pusher version should be $15 more than the standard jett-stream.

Bob
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Old 09-12-2007, 10:55 AM
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Kmot
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Default RE: pusher muffler - a few photos

Kewl.

So, is there some inner pipe that takes the gases to the rear of the muffler first?
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Old 09-12-2007, 11:39 AM
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bob27s
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Default RE: pusher muffler - a few photos

No..... that was the beauty of this

the performance was pretty much the same compairing both pusher and conventional configurations.
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Old 09-12-2007, 02:43 PM
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rmenke
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Default RE: pusher muffler - a few photos


Its all in the wrist, quit watching for things up his sleave!!. EnJOY
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Old 09-12-2007, 05:54 PM
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Flyboy Dave
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Default RE: pusher muffler - a few photos

....is the normal outlet plugged ?
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Old 09-12-2007, 07:45 PM
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Default RE: pusher muffler - a few photos

yes, it is plugged
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Old 09-13-2007, 10:21 AM
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Default RE: pusher muffler - a few photos

Yeah, in general, it doesn't matter where the gasses exit the pipe or muffler. It's the pressure waves travelling through the gasses that influence performance... not the gasses themselves. Take a look at the old "pusher pipes" for DF engines: same thing.

What took Dub so long...?
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