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

Scratch Built Speed Plane

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Old 11-19-2002, 12:39 AM
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PAINLESS
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Default Scratch Built Speed Plane

This is my attempt at a Speed plane, I have been working on it for about a month. Sharp eyed viewers will notice the absence of ailerons. It is not quite finished yet, it also still needs the radio and linkages installed.

It has;
TT 40 pro with a tuned pipe and 8x8 prop, engine has been modified and turns 18.5k on the ground, 15% fuel.

Wing span 40" area about 360 sq in.
Est wt 4 - 4.5 lbs
Balsa sheet foam wing, s6063 airfoil.

Should have it ready in a week or so. I feel confident it will be the fastest plane I have ever flown and the fastest in my club.
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Old 11-19-2002, 01:45 AM
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BruceDana
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Default Scratch Built Speed Plane

If you kept it light, based upon your ground RPM measurment, prop pitch, and apparent clean airframe you should see at least 140 MPH.

If you have a way to get a true reading (by RADAR or calibrated speed trap) post the speed for the rest of us.

Based on what I've learned so far, the delta's may not be the best choice for speed. The pylon type planes seem to be holding the edge.

Good luck
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Old 11-19-2002, 05:17 PM
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Flyboy Dave
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Default Why, no ailerons....???

....I think you might need them !!!
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Old 11-19-2002, 06:09 PM
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Cactus.
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Default Scratch Built Speed Plane

trust us, you need them, i built a SMALL plane with a big engine. you need them if only for take off, but no good crashing that soon. tailerons just don't work against that typea torque.

ahhhh you've not added them yet, i see cut outs... however. you'll want to dump those wheely type drag buckets you want to land on if you want to go fast.
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Old 11-19-2002, 07:44 PM
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Default Scratch Built Speed Plane

I don't know why but I always do the ailerons last when I build a plane.

I am using slim pylon racing wheels for now, didn't want the expense and weight of retracts on a .40 size plane. I don't have any grass to fly off of.

If this design works out I may build a slightly larger one with retracts and of course a much larger engine.

Still waiting on some servos.
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Old 01-11-2003, 08:16 AM
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Default Hummmm

Looks like scatcat with a zlin 30 wing very nice, really don't think you should fly while on grass anyway. (couldn't resist)keep the wheels just remove the straps holding the gear on and they will fall off on take off, HeHeHe!!!! Ilove them skinny wheels
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Old 01-11-2003, 08:47 AM
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Default Scratch Built Speed Plane

Thought about a simple engine cowl?

Should give you a few miles per hour more and looks cleaner. Not that it doesn't look fine as it is though
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Old 01-11-2003, 05:36 PM
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Default Scratch Built Speed Plane

The fuse is built similar to a Scat Cat but is longer.

The engine mount is a Foremost brand and completely cowls the bottom of the engine and a little of the sides.

I have flown the plane since that photo was taken. I was running a 9x6 prop and getting 18500 rpm on the ground with 15% fuel, but was blowing a plug every run. The thing is the fastest plane I have ever flown and the fastest in my club. I have not radared it but the general concensus amoung those who have seen it is between 130 and 140 mph. I switched to a 9x6.5 prop and quit blowing plugs, I don't understand that, it slowed down a little too.
At those speeds I can only fly straight and level for 4 or 5 seconds before having to turn around.
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