Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

sig kobra

Reply

Old 11-11-2004, 03:53 PM
  #1  
bill2796
Junior Member
Thread Starter
 
Join Date: Dec 2003
Location: mississauga, ON, CANADA
Posts: 23
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default sig kobra

hi all i built a kobra with the f16 tail it flies great my question is with rudder input it rolls the oposite way is this due to the slanted rudder line or something else? thanks.
bill2796 is offline  
Reply With Quote
Old 11-11-2004, 04:49 PM
  #2  
bob27s
My Feedback: (19)
 
bob27s's Avatar
 
Join Date: Apr 2002
Location: Cleveland, OH
Posts: 5,576
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: sig kobra

Hi......

Rolling the opposite direction. This is cause by too little dihedral in the wing. Really has little to do with the rudder and fin planform.

Too much dihedral, and the plane rolls in the direction of rudder throw. (such as with a trainer)

Well balanced dihedral......the rudder does little more than yaw the airplane around the CG (good aerobatic plane)

Too little, and the plane rolls opposite the direction of rudder throw.

On older pattern aircraft, folks would on occation actually saw the wing in half and re-set the dihedral if there was a bad roll couple.

I would not consider doing that on the Kobra. Generally not worth the work and weight.
bob27s is offline  
Reply With Quote
Old 11-12-2004, 08:31 AM
  #3  
bill2796
Junior Member
Thread Starter
 
Join Date: Dec 2003
Location: mississauga, ON, CANADA
Posts: 23
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: sig kobra

thanks i didn't think it was rudder and funny thing is i put in the amount of dihedral the plans call for oh well i just correct it with aileron during knife edge and such just annoying
bill2796 is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service