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

HELP Shrike and a TT 46 with a pipe

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Old 02-11-2006, 07:13 PM
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skyflyer47
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Default HELP Shrike and a TT 46 with a pipe

hey guys I'm a new speed freak i'm building a shrike 40 with a thunder tiger 46. Need to know props balence things like that. Also got a friend building one with OS 46. Any info would be great. thanks
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Old 02-11-2006, 10:40 PM
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Default RE: HELP Shrike and a TT 46 with a pipe

Heres mine. Its about 5 years old. TT 46 pro and a Performance Specialties Ultra Thrust Muffler. I get about a 120mph with this thing. They come out very nose heavy. I put the battery as far back as possible. I run a 9/8 apc. When landing, I make appraoches at a shallow angle because it runs out of elevator real easy.

My elevator deflects darn near 90 degrees up. You don't need it when your flying but you will use it all on landing to keep it from dropping like a brick.
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Old 02-12-2006, 04:38 PM
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Default RE: HELP Shrike and a TT 46 with a pipe

Thanks, I just got started building mine I think I'll mount the elevator servo way in the back to help with the balence. It's allready to late to move the firewall back.
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Old 02-12-2006, 07:17 PM
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Default RE: HELP Shrike and a TT 46 with a pipe

yeah i ran a tt 46 and a long tuned pipe with a 9*8 prop and saw 17,500 on the ground... i never cut the header all the way to peak rpm either.... great engine for the money
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Old 02-12-2006, 08:36 PM
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Default RE: HELP Shrike and a TT 46 with a pipe

Which size tuned pipe did you use 7.5 or 8.5? Do you actually have to cut the header or just the joiner pipe? How do you know when your done? thanks for the info, skyflyer
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Old 02-12-2006, 09:53 PM
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Default RE: HELP Shrike and a TT 46 with a pipe

da, can't remember the brand, what do you mean by 7.5 or 8.5? you do have to cut the header.. they reccomend you get 2 and keep cutting a little at a time till you see peak rpm, then cut the 2nd one to the perfect length.... i just cut till i was satisfied.... or too lazy too keep cutting I don't know how to upload pics so if you want pics email me erikpmort@gmail.com
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Old 02-17-2006, 06:08 PM
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Default RE: HELP Shrike and a TT 46 with a pipe

7.5 or 8.5 is the size in cc for Macs muffler.
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Old 02-17-2006, 10:12 PM
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Default RE: HELP Shrike and a TT 46 with a pipe

Here's mine. OS .46 SF ABC-P, Mac's header, cut to 3.375" (like Mac's suggests on their website), and the Mac's 7.5cc Quiet Pipe. Runs an APC 9x7 at 16,500-16,800 rpm on the ground, picks up a good bit more in the air. I would estimate the speed at 125-130 mph, about the same as a Q500 with the same engine and pipe. I moved the firewall on mine back to 1" forward of where the wing leading edges meet the fuselage, after reading about all the balance problems other folks were having, and needing to add weight. My battery pack is at the very back of the radio compartment, and it balances per the plan CG location with no additional weight. One other tip, I rotated the engine and mount counterclockwise, about 10 degrees, as seen from behind, to get the pipe to clear the wing and fuselage, and run parallel to the centerline for least drag. Also you need the LONG Mac's header #2591 to space the pipe far enough away from wing and fuse, the standard won't work well on this plane. I'm very happy with my setup.
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Old 02-17-2006, 10:16 PM
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Default RE: HELP Shrike and a TT 46 with a pipe

Oh, one other comment, in spite of moving the firewall back, I still had no trouble fitting in a 10 oz. Sullivan slant tank, the OS pump and a Great Planes fuel filler in the tank compartment. I did change the hatch setup a little, making a separate front and rear hatch.
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Old 02-19-2006, 01:30 PM
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Default RE: HELP Shrike and a TT 46 with a pipe

Hey thanks for all the good info, unfortunately my firewall is allready in the regular spot. I plan on moving everything movable as far back as I can hopefully I won't need to add much weight.
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Old 02-19-2006, 02:43 PM
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Default RE: HELP Shrike and a TT 46 with a pipe


ORIGINAL: skyflyer47

Hey thanks for all the good info, unfortunately my firewall is allready in the regular spot. I plan on moving everything movable as far back as I can hopefully I won't need to add much weight.
I extended the hatch back a couple of inches so I could put the battery at the very rear of the plane. I was able to get mine to balance without adding weight or moving the firewall back. Do whatever you have to do to make it balance and it will fly faster and land better.
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