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

My DD after 8 hrs.

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Old 08-05-2002, 11:09 PM
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soarrich
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Default My DD after 8 hrs.

My hats off to anyone that can build this thing in 2 1/2 hr., I've spent that long just look'n at the plans.

My Picco has a rear carb which complicates the mounting. What I found easiest to do was put 1/2" of AC ply under the mounting lugs. The engine JUST goes below the mounting plate by maybe 1/8". I may fill the bottom of the mount in with balsa so it won't catch on landings.

I only have a 8 oz. tank on hand, it seems to fit OK, so I'll use it. Where do you pickup pressure from a pipe, by the engine , or at the fat part of the pipe?
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Old 08-05-2002, 11:11 PM
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Default My DD after 8 hrs.

Another picture.
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Old 08-05-2002, 11:13 PM
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Default My DD after 8 hrs.

Sorry I goofed.
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Old 08-06-2002, 12:00 AM
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ChuckAuger
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Default Pipe tap..

Put your pipe tap about 1/4" in front of the fattest part of the pipe. And I can't really see, but you're not raising your thrust line 1/2" are you??
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Old 08-06-2002, 01:20 AM
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Default Re: Pipe tap..

Originally posted by ChuckAuger
you're not raising your thrust line 1/2" are you??
Yes, I know that will pull the nose down somewhat. Do you that that it will be unacceptable?
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Old 08-06-2002, 01:22 AM
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Default My DD after 8 hrs.

Mount picture.
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Old 08-06-2002, 01:33 AM
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Mount
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Old 08-06-2002, 01:37 AM
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Default Yeah...

I would mount the engine on the ply plate, put the beams under the ply plate extending back past the firewall, and cut the firewall out to make room for the carb. It looks like you have to butcher the firewall pretty bad, but I've had abot 4 less than perfect launches and mine is holding together..
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Old 08-06-2002, 01:43 AM
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Default My DD after 8 hrs.

OK, better now than after it's all covered.
Thanks
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