For those who may use this formula, this formula will only work on a right triangle.  Please correct me if I am wrong.
Joe
 
 

    ----- Original Message -----
    *From:* Ed Anderson <mailto:eanderson@carolina.rr.com>
    *To:* Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
    *Sent:* Saturday, January 12, 2008 8:30 AM
    *Subject:* [FlyRotary] Re: Angles

    Hi George,
         Several folks have responded to your question concerning angles,
    for what it is worth I also got 5.729 degrees.
         There are a couple of formulas you can use.  One common approach
    is to use
    ArcSin, but unless you have a convenient ArcSin function available
    that can be problematic.
         So instead I like to use this one for y/r (y being the vertical
    length of your angle and r the horizontal length)   Degrees = y/r
    * 180/pi   = 3/30*180/3.1456 =  5.729 deg.  This way you don't
    need a table/function of ArcSin.
         Ed