Re: Prop Efficiency

From: John Kagan <john_kagan_at_hotmail.com>
Date: Tue, 29 Aug 2006 02:56:19 -0000

--- In Indoor_Construction_at_yahoogroups.com, "markdrela" <drela@...>
wrote:
> If you give me the prop geometry in the following format,
> root to tip, I can easily run it with the appropriate airfoil
numbers.

That is very generous, thank you! I measured up one of my better
props. This is low pitch, which should correlate to about .1in/oz of
torque and about 50rpm. High pitch is about 5 degrees higher,
around .3in/oz, and 45rpm.

Radius (in) Chord(in) Angle(deg)
1.5 0.50 54
2 1.13 51
2.5 1.56 49
3 1.88 47
3.5 2.09 45
4 2.25 43
4.5 2.38 41
5 2.44 38
5.5 2.47 35
6 2.44 33
6.5 2.38 31
7 2.25 28
7.5 2.09 26
8 1.91 24
8.5 1.69 22
9 1.41 21
9.5 0.94 19
Received on Mon Aug 28 2006 - 19:56:47 CEST