Trimming Question

[Bob Pastorello]

MessageDecrease wing incidence, which will eliminate your need for "holding" slight down elevator.  You may ultimately have to trim it to REQUIRE just a small amount of down elevator, particularly if the CG is where you want it.
    Power off dive pitch moment is usually mainly influenced by wing incidence.

Bob Pastorello, Oklahoma
NSRCA 199, AMA 46373
rcaerobob at cox.net
www.rcaerobats.net


  ----- Original Message ----- 
  From: Peter Pennisi 
  To: discussion at nsrca.org 
  Sent: Sunday, August 17, 2003 5:33 PM
  Subject: Trimming Question


  I would like some suggestions to overcome a trimming problem I have with my current F3A model.

  Problem:

  The model pulls to canopy on vertical dives as well as vertical climbs

  Currently I have an electronic mix to overcome this problem but this is starting to get in the way on some manoeuvres.

  Setup:

  Model trimmed for hands off level flight.

    a.. CG is about correct. Any more further back model becomes nervous in wind and harder to snap - difficult to control exit. 
    b.. Model fly's with "NO" elevator trim. 
    c.. Model feel's about right inverted. A small amount of down elevator required to maintain level. 
    d.. 1-2 degrees of down thrust.
  Can this be overcome by changing wing incidence or will screw up something else.
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