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

Seagull Harmon Rocket / TT .61 Pro

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Old 01-26-2009, 10:10 AM
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Flyboy76
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Default Seagull Harmon Rocket / TT .61 Pro

Hello all, first off, i know that this would be a severe stretch to put in this category but i have some ?????? What kind of difference can i expect between a pitts style muffler and a tuned pipe for this combination?? I know that there are many different choices of engines which would have worked better for speed but the wife got me this setup for xmas and i wouldn't dare hurt her feelings by not using it. She's actually checked in on me a couple times while i was working on it to see how it was going.

Thanks in advance

Geoff
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Old 01-26-2009, 10:20 AM
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Default RE: Seagull Harmon Rocket / TT .61 Pro

My one experience with a Pitts-style muffler was a Pro .46 on an Edge 540. I had run the engine on another plane with the stock muffler and it was strong. Same thing with the Pitts - ran great!
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Old 01-26-2009, 10:44 AM
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Default RE: Seagull Harmon Rocket / TT .61 Pro

Ya i've had a pitts style on a couple of TT Pro .46's and they ran flawless, i'm just wondering if i will experience much speed gain with a tuned pipe over the pitts.
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Old 01-26-2009, 11:30 AM
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Default RE: Seagull Harmon Rocket / TT .61 Pro

....the tuned pipe will give a good boost over the stock muffler, and an
even better boost over a Pitts muffler, any day of the week.

The tuned piped gives a racing look as well, and a better sound.

FBD.
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Old 01-26-2009, 12:08 PM
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Default RE: Seagull Harmon Rocket / TT .61 Pro

Thanks Dave..... how the heck did you get that muffler on with the cowl in place???

Geoff
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Old 01-26-2009, 01:12 PM
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Default RE: Seagull Harmon Rocket / TT .61 Pro

....there is just enough room to get a long t-handle allen wrench up past the header
to get the allen bolts in. The header flange is shaped like a triangle, held on with 3
bolts, that's why the cowl cut-out is shaped like it is in pic #2.

When I bolt the header on, the cowl is not screwed on, so I can get enough wiggle
room to help bolt on the header. Then the cowl is screwed into place with several
screws. I dislike Pitts mufflers, I will not use one. I got one with a used engine onece

....I gave it away. They do not help anything, they cause too many problems. []

FBD.
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Old 01-26-2009, 02:24 PM
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Default RE: Seagull Harmon Rocket / TT .61 Pro

aaahhh! gotcha after looking at the engine it makes sense. I would not be able to do it that way as my engine has a standard mount where the allen bolts come from the other side into the the muffler.

Geoff[&o]
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Old 01-26-2009, 02:25 PM
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Default RE: Seagull Harmon Rocket / TT .61 Pro

By the way, how does that setup fly on yours??

geoff
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Old 01-29-2009, 09:04 PM
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Default RE: Seagull Harmon Rocket / TT .61 Pro

....I have not as yet completed that plane.
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