help with chosing airfoil section's for wing and tail. 2 meter

[John Ferrell]

I am not familiar with that airplane.
Building a foam wing strong,stiff and precise is easy compared to doing the same with a built up wing.

All pattern birds I am aware of use symmetrical airfoils as thick as they need to be to be strong. dihedral is important. Leading edge sweep is more important than trailing edge sweep. Most designers like the tips to be 50% of the root but this may be influenced by the difficulty in cutting foam at greater than a 2:1 ratio. 

The only quality issues that I can think of that condemn a foam wing core are weight poorly formed beads. If you can build a built up wing, you can fix everything else!

Each maneuver flown should be considered when tinkering with wing parameters. There are a lot of nice planes that are tough to snap or spin. 

I must have an airplane that helps my weaknesses!

John Ferrell    
http://DixieNC.US

  ----- Original Message ----- 
  From: DrMarkMD at aol.com 
  To: discussion at nsrca.org 
  Sent: Tuesday, November 15, 2005 8:18 AM
  Subject: help with chosing airfoil section's for wing and tail. 2 meter


  I was not happy with the cores I got from the kit I purchased so decided to try to build a hollow composite wing for my Ricochet electric power and weighing in at 10.75 lb..   Since I will be able to now pick the sections. I would like to learn from you guys rather than trial and error.  Would you guys mind sharing your choices and thoughts. 

  Mark Lamos
  Baltimore 
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