Posted for "JHWebb" <airmale@windstream.net>:

 In a past life I had the finances of a fairly large comporation to
 experiment and we were told by suposely knowledgeable aeronautiaclc expert
 to angle the vertical fins for the rotating slipstream and P factor. It
 turns out that this makes the airplane more difficult to fly. Requires a lot
 of rudder trim changes. After much expermantation we discovered that straigt
 ahead worked best. Then you don't have to trim for any speed change as well
 as power changes. If the vertical surface has 0 deflection you only have to
 trim for power changes and at higher speeds this requirement is almost zero.
 
   Sumerizing the best configuration is no defection, plus it produces lower
 drag overall.
 
 Jack Webb
 L360, LIV
 BSAE
 
"""
  BTW - Our fin is perfectly aligned with the direction of flight, but
  maybe a different alignment is better due to the asymmetry of the
  airflow from the prop.  Does anyone have any experience with this?
"""