control surfaces deflection

[inedesca]

Is there a rule for control surface deflection calculation?

I think there should be a recommended deflection for a new design.

Something like this maybe:

take the lynx xf for example: recommended deflections about 10-12 mm ailerons and 10-15 mm elevator.

ailerons are 40 mm chord
wing is 200 mm chord

elevator is 40 mm chord
stab is 100 mm chord

so in terms of percentage we have

ailerons deflection = 10/40 to 12/40 = 25-30% of aileron chord
or
ailerons deflection = 10/200 to 12/200 = 5-6% wing chord

elevator deflection = 10/40 to 15/40 = 25-30% elevator chord
or
elevator deflection = 10/100 to 15/100 = 10-15% stab chord

could this rule apply to a new design?

I have never seen any discussion on the subject.

How you do it?

[harveyweewax]

There was a discussion on this subject earlier this year in the builders workshop. Here is the thread.

http://www.rcgroups.com/forums/showthread.php?t=647089

I don't believe there are any hard or fast rules. Like most things in aircraft design it's going to depend upon the mission or task the plane is designed for and/or the designers taste.

Regards,

Sven