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

APC 7x9 at 22000rpm, any one useing it?

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Old 05-26-2003, 04:32 PM
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Henke Torphammar
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Default APC 7x9 at 22000rpm, any one useing it?

Hi

was thinking of a new fast delta to take over after my retierd Storm.

it had 550watts in, 28000rpm on a 4,7x4,7

the new plane will have 1300watts in, almost 22000rpm on a APC 7x9. the plane will look almost the same, but a bit more sweep and a smaller fin.

you think 200mph is possible?? (in a dive)

those magnums going 200mph, which prop and which rpm?


Thanks

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Old 05-26-2003, 07:35 PM
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Cactus.
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Default APC 7x9 at 22000rpm, any one useing it?

i know this isnt the size you'll have, but you dont have much span, the torque will be a problem.
Magnums get 185ish on the flat, 21k ( ground ) 8x8 APC's
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Old 05-26-2003, 07:51 PM
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Henke Torphammar
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Default APC 7x9 at 22000rpm, any one useing it?

Hi

thanks for the info in the magnum! I guess I might reach my goal if I can keep the drag down!

the tourqe will probably make the plane get out of trim with open throttle.... My microJet rolls slowly at full throttle, if timmed out at low power, but it is not a big problem, easy to hold it level.
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Old 06-05-2003, 04:26 AM
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Default APC 7x9 at 22000rpm, any one useing it?

My microJet rolls slowly at full throttle, if timmed out at low power, but it is not a big problem, easy to hold it level.


Do you think you need more torque in your servos? Sounds like they may be laying down some. May need higher torque servos with the higher speeds for your beast.
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Old 06-05-2003, 03:50 PM
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Default APC 7x9 at 22000rpm, any one useing it?

nah, i have feathers in mine, goes like stink, noooo problems, its just a small wing spanVS torque, my dust is the same, even my Cougar come to think of it
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Old 06-05-2003, 04:26 PM
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Henke Torphammar
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Default APC 7x9 at 22000rpm, any one useing it?

hm, strange did my post disapear?

I was saying that the microJet is a smaller foamie meant for speed 400 use, upgraded mine with a brushless motor, about 70mph. no problem with weak servos at that speed, but my BIG one will have servos that can handle the force needed.

BTW, got the 7x9 prop here now
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Old 06-05-2003, 10:45 PM
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Default APC 7x9 at 22000rpm, any one useing it?

the plane in the picture looks like correx (coroplast).
the exposed edges of the correx are very draggy and so are all the exposed linkages at the back end, seal your hinge gaps and the wing edges and you will be going a bit faster with it.
also with such a long fuselage and low aspect ratio wing you are creating a LOT of drag when you are at any angle of attack greater than 0 degrees, and being a flat plate airfoil you are relying on the angle of attack to keep the model flying.
if you were to design a new model with a larger wingspan and shorter fuselage with a thin symmetrical wing section it would be a lot faster.
hope this helps, nice plane by the way
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Old 06-06-2003, 01:48 PM
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Default APC 7x9 at 22000rpm, any one useing it?

Hi

its made from 4mm balsa sheets, 2mm for the fuse.

I know there are faster airframes, but this one is cheap and easy to build.

was looking at a F3D plane, but they are made for turning not for levet topspeed... dunno if that is what I want...

the delta is good enough to try out the new motor and prop :-)
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Old 06-06-2003, 01:55 PM
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Default APC 7x9 at 22000rpm, any one useing it?

the delta is good enough to try out the new motor and prop :-)
i wasnt dissing it!
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Old 06-06-2003, 05:31 PM
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Default APC 7x9 at 22000rpm, any one useing it?

LOL I know
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Old 06-07-2003, 05:55 PM
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Default Re: APC 7x9 at 22000rpm, any one useing it?

Originally posted by torpis
Hi


those magnums going 200mph, which prop and which rpm?


Thanks


... 8x8 APC... probably unwinding to something like 23000 or 24000 in the air...
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Old 06-07-2003, 07:48 PM
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Henke Torphammar
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Default APC 7x9 at 22000rpm, any one useing it?

Hi

yeah, 24k = almost 200mph(calculated pitch speed). was thinking as I get 22k on the ground 9" pitch I might actually reach my target as the prop unloads in the air....
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