Q-40 Racing Discuss AMA 422 and any other variants of Quarter 40 racing

F5D wings (Dihedral or no Dihedral)

Reply

Old 05-05-2008, 04:05 PM
  #1  
oddy
Thread Starter
 
Join Date: May 2003
Location: Mexico city, MEXICO
Posts: 353
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default F5D wings (Dihedral or no Dihedral)

Hello everyone.

Could anyone tell me if F5D pylon racer wings use some dihedral.

I understand they do have dihedral in the bottom part of the wing but flat in the bottom.

Please any help will be highly appreciated
Attached Thumbnails Click image for larger version

Name:	Sq46853.gif
Views:	30
Size:	28.1 KB
ID:	943545  
oddy is offline  
Reply With Quote
Old 05-08-2008, 06:44 PM
  #2  
ptxman
My Feedback: (2)
 
Join Date: Jul 2002
Location: Calgary, AB, CANADA
Posts: 395
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: F5D wings (Dihedral or no Dihedral)

Most commercial F5D models have a minimal amount of dihedral. Im guessing maybe 1 degree. I could measure some of my models (Avionik D2005 etc) if you need something more accurate. Im really not sure why they even bother, the wing sction C/L is so close to thrust datum relative to other kinds of models & the fuselages are so skinny (< 2" at their tallest part). If anything, a 'top wing' model should probably have negative dihedral (anhedral) for minimal roll coupling, but its kind of a pain to mold & build. Q500's (top wing racers) are typically straight = zero dihedral & they work fine. I would say for 300 kph racing, dihedral doesnt even enter the picture, there is negligible side slipping & roll couple. It might help a bit on landings & just be 'neutral' for racing, maybe thats the thought. The model you are showing is quite dated BTW.
ptxman 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