[NSRCA-discussion] Trimming Question

[Mike Hester]

I usually carry a bit more down travel than up. That's normal. Twice the amount of throw....hmm that doesn't sound right does it?

I'd have to be with the plane to see if you really have a problem or if the set up is just kinda whacky. How much expo are you running both ways? 

Also take a measurement of the stab incidence, or as well as you can. It should be around zero. Also look at the alignment of the elevator to the stab itself and make sure you're not carrying any large amount of trim, because that can make things wierd. 

I have had more than a few people tell me it trims out better with a hair of positive incidence in the stab, in fact I carried some for a while. It's hard to guess if you don't have an exact reference to go from.

-Mike

  ----- Original Message ----- 
  From: Rick Rosinski 
  To: nsrca-discussion at lists.nsrca.org 
  Sent: Wednesday, July 04, 2007 11:26 AM
  Subject: [NSRCA-discussion] Trimming Question


  I have a trimming question for you guys. A couple of days ago I was checking the amount of control throws on my first Black Magic V2 so that when I set up my backup plane I'd have a ballpark setting to start with. The ailerons and rudder were about what I expected, but the elevator was 5 degrees of up throw and 10 degrees of down throw. The wing incidence is set per the plans and the CG is at the leading edge of the wing tube with the wings off. The airplane has the same feel when I add up or down elevator. Inverted flight requires a little down elevator. Basically the airplane feels just right. 

  I'm wondering what you guys think I should do to correct the differential in up and down elevator throw? I was thinking that I may have a little too much positive incidence in the stab. Any suggestions? 

  Rick 



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