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

Diamond Dust and OS46?

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Old 09-06-2005, 01:14 PM
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Ken Bryant
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Default Diamond Dust and OS46?

I am looking at getting a Diamond Dust and I was thinking of using my OS 46 in it.
What kind of speeds would I most likly be able to achive with this combo?

I know it won't be blistering fast but I figure it would get me started and I can work up from here.
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Old 09-06-2005, 05:51 PM
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Default RE: Diamond Dust and OS46?

That is same set up I had on my first DD and it was pretty fast. Much faster than other planes at field. Not super sonic but looking at it you would say fast.

I messed around with props and found a REV-UP 9x7 3/4 at my LHS. I think it was last one. But that one seemed to work the best.

Later bolt on a HOT engine and go from fast to extremely fast. Apples and oranges from a standard engine to a Hot engine. Sounds better too.
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Old 09-06-2005, 07:01 PM
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Mike Connor
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Default RE: Diamond Dust and OS46?

My first dust had a 46FX with an UltraThrust turning a APC 9x7 about 16,500 static. Breaking 100 mph should not be a problem.
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Old 10-02-2005, 10:26 PM
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Default RE: Diamond Dust and OS46?

Can someone tell me why when I put a prop like a 9-7 on my 46fx w/Mac's tuned pipe it runs terrible at peak. With a 10-6 a bit better. With the smaller prop I have to pretty much turn my high speed all the way out to get it to run decent and not sputter in a dive.??? using powermaster 10% and getting revs like 16,000 on the ground. This in on a sonic 500, not the fastest or most aerodynamic plane. re plumbed fuel tank and added LOTS of foam. Even tried this on a bench test. With needle valve 2-2 1/2 turns out the engine will quit if carb is opened over 3/4 throttle.
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Old 10-03-2005, 08:44 AM
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Default RE: Diamond Dust and OS46?

I think there are instructions on Mac's web site on tuning the pipe. Your pipe may be the wrong length for a 9x7.
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Old 10-03-2005, 01:25 PM
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Default RE: Diamond Dust and OS46?

would it be over revving on a 9-7? seems like it can't get enough fuel
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Old 10-03-2005, 02:18 PM
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Default RE: Diamond Dust and OS46?

It is not overrevving if it is an FX version, they are very happy around 16,500 rpm. An APC 8.8" x 8.75 pylon prop would work well on that plane and engine.

If you have the newer AX version you are overrevving, they seem to develop best speed around 14,500. An APC 10x7 works very well on the AX.
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