Re: pitch block trivia

From: Mark <f1diddler_at_yahoo.com>
Date: Thu, 03 Jul 2008 16:52:54 -0000

--- In Indoor_Construction_at_yahoogroups.com, "John Barker"
<john.barker783_at_...> wrote:
>
> It seems to me that if wanting to form a 28" pitch propeller on a
26" pitch
> block that the blank would need to be moved inwards, not outwards,
to use
> the higher forming angles.

I don't see that. Going inward (closer to hub, shaft) on my pitch
blocks amounts to a faster rate of angular change per inch of
diameter, and I associate that with lower nominal pitch. Crudely
said, higher pitch props have "less twist" over the whole blade.

<<. Note that this is the change of angle from end to end of the
blade, the blade must still be set on the spar to get the correct
pitch. However it does indicate the blades formed on less than
perfect moulds (or evenbottles!) can perform as well as they do.>>

We can agree there, and the very reason I titled this "trivia"
although triggered in actual building.
Mark F1diddler

(Gotta check out until after Kibbie Dome Anuual.)
Received on Thu Jul 03 2008 - 09:52:58 CEST