Thanks Mark, as usual you've enlightened me and converted what I
considered a difficult question to an easy understanding. Now I can go
down to the basement and set the pitch on that prop and get it ready to
test on Friday.
LeRoy Cordes
AMA 16974
Chicago, IL
In God We Trust
On Sun, 17 Feb 2008 22:38:03 -0000 "Mark" <f1diddler_at_yahoo.com> writes:
> --- 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
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
LeRoy Cordes
AMA 16974
Chicago, IL
In God We Trust
Received on Tue Feb 19 2008 - 06:58:52 CET
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