--- In Indoor_Construction_at_yahoogroups.com, LeRoy C Cordes
<lcordes_at_...> wrote:
<< A MiniStick
> plan I have calls for an 11" pitch, would that be the 11 on the
Bradley
> gauge ?
>
Technically, YES, but with some practical caveats. A given angle at
a certain pitch will occur at the same radius on a prop regardless of
the overall prop diameter. But for "pitch setting purposes" this
assumes the blade is formed at close to helical pitch (rate of
twist.) If that's not certain, then it's best to pick a compromise
radius at which to set pitch, and that becomes the "nominal pitch."
70% of radius seems a good compromise for ministick. If you want a
11" pitch, set blade at 34 degrees at 2 5/8" radius. This should
yield 11.1" pitch. Now, how this comports with a "Bradley pitch
gauge" I can't say. If gauge was designed for larger props, it's
possible that the wiggle at the shaft holder could wreck an accurate
pitch setting for a ministick prop. You just have to watch how much
things move around on the gauge, at all times. If your gauge works
off of 45 degree angle, as some do, then set 45* at 1.75". Should
yield 11.0" pitch also.
Mark F1diddler
Received on Sun Feb 17 2008 - 14:38:06 CET
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:45 CET