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

prop for DD and Sport Jett .50?

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Old 06-06-2007, 02:14 PM
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Zman39
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Default prop for DD and Sport Jett .50?

I just threw a jett 50 on my Diamond Dust, was hoping to get an idea on what prop to use for most potential speed, assuming it holds together .

Thanks

Z
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Old 06-06-2007, 05:06 PM
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Razor-RCU
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Default RE: prop for DD and Sport Jett .50?

Bob will probably try to copy this info. but here goes:

If its a standard Sport Jett .50, the 9x7 is a good place to start, then move to a 9x8.
Good speed, good launch, good balance of performance.

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Old 06-06-2007, 08:53 PM
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Mike Connor
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Default RE: prop for DD and Sport Jett .50?

I have well over 100 flights on two DD's with a Jett 50 and I always ended up back with a APC 9x8 for all around performance. To me it was a good balance of thrust and speed. Experiment a little to see what fits your style of flying.
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Old 06-06-2007, 09:23 PM
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Default RE: prop for DD and Sport Jett .50?

What engine are you running? If it's the standard side exhaust version, prop it so it stays within Jett's recommended rpm range... like Mike said...

If it's the RE version, and you have it piped, you can set it up for a little more rpm and can probably make better use of the Q500 props: they tend to work better above average "sport" rpm levels.
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Old 06-07-2007, 10:41 AM
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Default RE: prop for DD and Sport Jett .50?

..yeah... what they said

If its a standard Sport Jett .50, the 9x7 is a good place to start, then move to a 9x8.
Good speed, good launch, good balance of performance.
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Old 06-07-2007, 11:03 AM
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Zman39
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Default RE: prop for DD and Sport Jett .50?

Thanks all,

It is a sport jett and I will give those props a try.
Any idea on what speed range I will be in roughly?


Z
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Old 06-07-2007, 11:21 AM
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Mike Connor
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Default RE: prop for DD and Sport Jett .50?


ORIGINAL: Zman39


Any idea on what speed range I will be in roughly?


Z
With the SS muffler I was turning a 9x8 around 18,000 and covered the tank for less drag. My unvarified speed timing over distance using a video camera was 150+mph. My method left a small margin for error because of parallax.
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Old 06-07-2007, 06:19 PM
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Default RE: prop for DD and Sport Jett .50?

I knew Bob would copy me
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