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

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Old 10-10-2002, 12:56 AM
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wojtek
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Ok don't laugh .. I think the Spectrum is one os the best flying ARFs out there ... yea its built like crap (gear mounts break, fuselage snaps in 1/2, etc ... ) , but it flies great ... i got mine up to 90mph on a os 46fx with pipe .... i clipped the tail fin durring an inverted pass and the plane is gone .. so im on to another one .. this time im reinforcing the whole plane (and recovering the wings) .... I have a OS 90fx with a tuned pipe going in it ...


my question is ... what is the best prop to use .. i need to get the smalest diameter possible (under 12) to clear the ground on the nose .. will a 12x12 be ok ? or is this still too loght for this engine ? how about 3 blade deals ? what should i use ??



thanx ..


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Old 10-10-2002, 02:18 AM
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I have put two 90's in 40 sized planes. Both disappointing outcomes. By the time you beef the plane up, put the bigger engine/prop/spinner/pipe/tank, add tail weight...your going to be up about a pound. The fly-ability and performance aren't going to be what you expect. Takes more to get up, hotter landings, snaps like crazy and a hard landing will break something...especially with retracts. I ended up taking the 90's back out. I have found lighter/smaller with higher revving engines to work better for me. This is just my limited experience.But you have to decide what you are looking for...speed...vertical...maneuverability. I didn't see much speed increase with the larger engine either. Airframe/airfoil was more of a limiting factor.
But to answer you question the 12x12 prop will work on the engine and is a reasonable place to start. Field testing will be the only way to tell.
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Old 10-10-2002, 08:04 PM
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TRY USING 12x14 APC PROP
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Old 10-10-2002, 08:06 PM
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12x 14 !! wow, did not know they had one !!


thanx !


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Old 10-10-2002, 08:10 PM
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YEAH GO TO APCPROP.COM
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Old 10-10-2002, 08:21 PM
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may need to cut the tips down to get the rpms up into the range you need. Just be sure to rebalance.
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Old 10-20-2002, 08:15 PM
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HEY LET ME KNOW HOW THAT 11x14 prop performs.
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