Differential question

[ronlock]

I agree with Larry on cutting the wing to remove most of the dihedral.

Whether you take dihedral out or not, use aileron differential,
more up aileron than down.   There isn't a specific correct
amount of how much more up.  You can experiment with that.
The "flatter" the bottom of the wing, the more diff you will want.
Fully symetrical wings need very little dif.

Ron Lockhart
  ----- Original Message ----- 
  From: Larry Diamond 
  To: discussion at nsrca.org 
  Sent: Thursday, September 26, 2002 9:59 PM
  Subject: Re: Differential question


  Emory,

  This may be a bit more than your willing to do...However....

  If you are gutsy enough, cut the wing in half..."straight" down the center and make a new center rib, ? Epoxy and glass the center 3 to 4 inches to prevent the wing from collapsing when pulling loops. When putting the wing back together, remove as much dihedral as you dare (leave say about 3/8 inch or so).

  I did this to a Great Planes Trainer 40 and flew it for 8 years with a .46 engine. Great performer for funfly events with respectable rolls and would perform Sportsman maneuvers with ease. The Trainer 40 did have symmetrical wings though. I would venture to say that you would have an easier time with rolls as well as reduce roll coupling from rudder inputs if you reduce the dihedral.

  Good luck...

  Larry
    ----- Original Message ----- 
    From: Emory Schroeter 
    To: PatternList ; Pattern NSRCA 
    Sent: Thursday, September 26, 2002 11:49 AM
    Subject: Differential question


    Hey,

    This doesn't exactly fit as a pattern question, but... I am doing a little kit bashing. My dad gave me a little .25 sized trainer and I am recovering it and making new ailerons, elevators and a rudder to turn it into a fun-fly type plane. The airplane has a fair amount of dihedral (about 4 inches when one half of the wing is flat). I know it will never roll like a pattern plane, but what kind of differential do I need to give it so that the rolls will somewhat straight? Do I need more up or down and about what ratio? Just looking for some ideas.

    Thanks, Emory Schroeter.
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