>
>      > The pitch of my old wood propeller which I am retiring is given
> in
>      > inches, while my new Warp Drive uses degrees to set pitch. No
>      > reference
>      > to inches.
>      > What is the relationship between the two methods of
> measurement?
>      > Can you direct me to reference material (for the layman)?
>      > Yvon
>      >
>      > Good question.
>      >
>      > --
>      > Paul Lamar ...No rotor no motor.
>      >
>
>     I suggest you call Warp drive with your engine/airspeed/aircraft
>     imfo. I was advised to set my prop
>     to about 12 degrees...It is now set to 11.5 degrees ! Adjust
>     the prop in VERY small increments...
>     ,5 degrees or less.If you learn how to correlate degrees
>     to pitch please let me know : ))
>     Charles in south Mississippi
>
> In order to figure out pitch in inches, you need to know the diameter
> of
> the prop. Think of it like this- the prop is turning through a medium
> where there is no slippage. One revolution of the prop pulls (or
> pushes)
> the airplane how far forward (in inches)?
>
> Get out your trigonometry textbook.
>
> Not  trying to be  a smartass, but I'd have to dust mine off to give
> you
> an answer, if I knew your prop diameter, but I'm at work and don't
> have
> it here.
>
> Brian Trubee

Thank you all people. I will keep you informed of my progress in
installation and testing.
Yvon.

Hi Yvon,

There is more to a prop than just pitch. Twist is also important.
Here are three examples. You need to add a few degrees
to these numbers to generate thrust.
Note that even at 100 MPH design speed a prop
needs  55 degrees twist. Unfortunately the Warp Drive blade has
very little twist. As speed increases the twist angle also
increases slightly. The IVO prop is also defective
in this regard with very little angle of attack near the hub.

RPM = 2700  MPH = 100
    Radius  Tang FPS Tang MPH    Angle
       3.00     71       48.2     64.3
       6.00    141       96.3     46.1
       9.00    212      144.5     34.7
      12.00    283      192.7     27.4
      15.00    353      240.9     22.5
      18.00    424      289.0     19.1
      21.00    495      337.2     16.5
      24.00    565      385.4     14.5
      27.00    636      433.5     13.0
      30.00    707      481.7     11.7
      33.00    777      529.9     10.7
      36.00    848      578.0      9.8

RPM = 2700  MPH = 150
    Radius  Tang FPS Tang MPH    Angle
       3.00     71       48.2     72.2
       6.00    141       96.3     57.3
       9.00    212      144.5     46.1
      12.00    283      192.7     37.9
      15.00    353      240.9     31.9
      18.00    424      289.0     27.4
      21.00    495      337.2     24.0
      24.00    565      385.4     21.3
      27.00    636      433.5     19.1
      30.00    707      481.7     17.3
      33.00    777      529.9     15.8
      36.00    848      578.0     14.5

RPM = 2700  MPH = 200
    Radius  Tang FPS Tang MPH    Angle
       3.00     71       48.2     76.5
       6.00    141       96.3     64.3
       9.00    212      144.5     54.1
      12.00    283      192.7     46.1
      15.00    353      240.9     39.7
      18.00    424      289.0     34.7
      21.00    495      337.2     30.7
      24.00    565      385.4     27.4
      27.00    636      433.5     24.8
      30.00    707      481.7     22.5
      33.00    777      529.9     20.7
      36.00    848      578.0     19.1


I got kind curios about what happens to the twist if you slow
the RPM to 2100 at 150 MPH for cruise. The optimum
twist changes by almost one degree. Note the
zero thrust angle of attack only changes
by about 2 degrees. See the attached jpg.

Fixed pitch props are very point design
devices. You need to tell the prop guy
what you want to do. Tell him the prop RPM,
the HP at that RPM and the cruise speed you
you wish and probably the drag of the airplane
at that cruise speed. One blade design certainly
does not fit all requirements.

-----------------
ops pasted in the wrong chart.
Here is the corrected jpg. Twist changed only slightly.

Why didn't you guys catch that? :)

Paul Lamar ...No rotor no motor.