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Prop Conversion?

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Old 05-23-2003, 05:54 PM
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outflying3d
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Default Prop Conversion?

Does anyione have a chart to convert a 2 blade (apc 13 x 8) to a three blade (perferably apc) prop?

Any help would be great!
Thanks,
Curt
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Old 05-23-2003, 06:38 PM
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tailskid
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Default Prop Conversion?

I don't know of any chart, but the general rule is to drop back one inch in diameter and add one to the pitch......

Jerry
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Old 05-24-2003, 02:30 AM
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DBCherry
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Default Prop Conversion?

Tailskid,
Doesn't that rule apply when changing sizes between two bladed props?

I'd always heard that to convert from 2 to 3 blades you only drop an inch in diameter. (ie. 2 blade 13 X 8 = 3 blade 12 X 8.)
Dennis-
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Old 05-24-2003, 07:59 AM
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Steve Lewin
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Default Prop Conversion?

The real rule for equivalent power is to reduce the prop diameter by 10% and leave pitch alone.

By a bit of good luck 10% = 1 inch for the most common 10/11" props.

Generally you can't do it very accurately because there is only a limited range of 3-blade props available. In this case 11.5 x 8 would be about ideal, if you could find one.

Steve
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Old 05-24-2003, 11:29 AM
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Jemo
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Default Prop Conversion?

Here's a guide

http://www.zingerpropeller.com/_2_blade_.htm
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