outflying3d

My Feedback: (11)

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

tailskid

My Feedback: (34)

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

DBCherry

My Feedback: (4)

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-

Steve Lewin

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

Jemo

My Feedback: (5)

Here's a guide

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