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

Can you use an apc 9x10 on a .46?

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Old 08-07-2002, 03:02 AM
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rsieminski
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Default Can you use an apc 9x10 on a .46?

The plane weighs almost 6 lbs, and I want as much speed as I can get. Can I, should I run this prop, or is there a better one?
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Old 08-07-2002, 10:43 AM
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MMallory
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Default Can you use an apc 9x10 on a .46?

For a 6 lb. plane you might want to step up to a .60 sized engine. The only way to tell an engine will turn a prop is to run the recommended prop and check the rpm, then run the questionable prop to see if there is a significant drop in rpm. Most .46's would run closer to an 8x10 (if you want a 10 pitch). Personally I would try a 9x9 first.

Mark
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Old 08-07-2002, 03:54 PM
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Default Can you use an apc 9x10 on a .46?

I run one on a K&B .48 with a tuned pipe. Hauls my DD around much quicker than the 9x8. Without a tuned pipe though, the 9x8 may work better. Also, the dust is ~2.5 lbs and very low drag. A 10x7 may prove to be the fastest depending on your planes design.
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Old 08-07-2002, 08:22 PM
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Default Can you use an apc 9x10 on a .46?

I don't necessarly need a 10 inch pitch, just more speed. Right now it'll spin an 11x5 at 15.5-6k. If it runs wot much less than 14.5K, midrange seems to richen up. I'll see what it does with a 10X7. I don't want to have less than 1:1 thrust:weight ratio.
What brand of prop does everyone prefer, APC or MA? I find the MA spin up faster and spin higher rpm, without visible difference in flight performance.

RSands,
Any idea what rpm it runs with that prop?
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Old 08-07-2002, 08:28 PM
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Cyclic Hardover
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Default Can you use an apc 9x10 on a .46?

Well I am running a 9/7apc on a 4lb Shrike turning 17k at 130mph on a simple TT46pro!. Your asking for way to much out of a .46 size engine on a 6lb plane. What kind of plane is it?
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Old 08-08-2002, 02:03 AM
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Default Can you use an apc 9x10 on a .46?

I've not tached my motor, but APC's blow the MA's away in terms of performance/efficiency.
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Old 08-08-2002, 02:19 AM
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Default ?

What kind of plane, and what kind of engine...?
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Old 08-10-2002, 04:01 AM
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rsieminski
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Default Can you use an apc 9x10 on a .46?

It's a piped Tower .46bb, on a spad. It'll turn an 11x5 at 15.6K+. On 15%N, 20%O (80/20). It seems very strong for a .46.
The plane is just too draggy. I cut the span down to 42" from 48", and streamlined it a bit. I tried a 10x8 today, but didn't tach it. It seemed to be faster visually though. Acceleration really suffered though. I weighed it yesterday on an accurate scale....gulp 6.6Lbs! I shaved a little more than 6 oz with the wing shortening.
I also tried an 11x7, acceleration was better but not as fast as the 10x8.
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Old 08-10-2002, 04:56 AM
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JohnVH
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Default Can you use an apc 9x10 on a .46?

Ive got a 9x7 or 8 on a DD with a OS.46, It sounds awesome in a full throttle dive!
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Old 08-10-2002, 06:42 AM
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Default A 9-10 prop on a .46 ?

Nope....9-8...tops...( 9-7 )better... ( if ya want all the revs out of it) 10-6 is good too, but even a 10-7 will reduce the revs...
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