Differential question

[Larry Diamond]

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.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.f3a.us/pipermail/nsrca-discussion/attachments/20020926/8d6d3c5c/attachment.html