Mailing List flyrotary@lancaironline.net Message #7180
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] Re: long comments after 2 hours on rev-2
Date: Sat, 10 Apr 2004 19:43:01 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
When you measured the prop angle what proceedure did you use?
 
 
The angle is measured at the tip, which is per Warp Drive's instructions, using a protractor that they provide with the prop.  You first use the prop hub angle as a zero point, then measure the flat, rear side of the blade.  
 
FWIW, on the Warp, this angle is not a good indication of the overall pitch of the blade, so it really can't be compared with any other prop, or used for any sort of calculation.  For example, 13 degrees at the tip of a 68 inch prop comes out to 48 inches of pitch.  When I enter my TAS and rpm numbers into a couple of prop programs, they agree that my 13 degree setting is actually a 58 inch of effective pitch.  15 degrees seems to work out to 63 inches of effective pitch. 
 
Sorry to hear about the continuing coil problems.
 
Rusty (I don't want to go)
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