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

What Prop For Speed?

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Old 09-20-2006, 03:38 PM
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hilleyja
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Default What Prop For Speed?

I have a Lanier Shrike 40 ARF with a Webra Speed 40 and am currently running an APC 10x6 prop.

What is my best speed prop? According to the manufacture they recommend either a 10x6 or 11x4 for this engine. Can I get more speed if I drop to a 9x6? Is the 11x4 better than the 10x6?
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Old 09-20-2006, 03:49 PM
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bob27s
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Default RE: What Prop For Speed?

For speed, you want smaller diameter and more pitch.

11x4 = slower flight speed. Lots of static and take off thrust/airflow (best for trainer or scale plane). Disk area also helps slowing down for landing

10x6 = all around general performance - good mix of initial take off thrust, speed, vertical

9x7 = speed, at expense of inital static thrust - but not generally a problem for your aircraft

Mfgs recommendations are just that - recommendations.

The webra speed .40 loves to turn up. Allow it to.

The 10x6 you have is a good start. Move to an APC 9x6 or 9x7 - maybe try a 9x8 too after you get some time on the combination.
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Old 09-20-2006, 06:26 PM
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Default RE: What Prop For Speed?

9x7 As Bob mentioned or a 9.5x6 - An 8x8 would be fun
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Old 09-20-2006, 08:26 PM
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carwood444
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Default RE: What Prop For Speed?

You are going to have to buy a few prop's and experiment a little. 8x8 0r 8x9. Maybe 9x8. I am pretty sure you will be in the 9 inch range.
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Old 09-24-2006, 02:27 PM
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Default RE: What Prop For Speed?

Hi!
9x7, 9x6.5, 9x6 APC. Probably the 9x7 will be best!

Regards!
Jan K
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Old 09-24-2006, 04:54 PM
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Default RE: What Prop For Speed?

I really think the 9x8 will be a tad too much but remember half the fun is buyin' and tryin'!

Sounds like a great combo.
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Old 09-24-2006, 06:46 PM
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Default RE: What Prop For Speed?

I run a 9x7apc but I have an 8x9apc I'd like to try on mine sometime
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