Re: [Paparazzi-devel] My new toy is ALIVE

[Chris]

Hi Reto yes i will post in the wiki as soon as possible (for sure 
tomorrow at work).
About the flutter problem, i use a Kontronik Tango 45-06 with a 13X8 
Graupner and 8S lipo which gives me a pitch speed of 108km/h and that 
gives me a final speed below the X8's fluttering speed of ~100km/h
Either use flat or round carbon spars spanwise (i use flat) where the 
X8's spars end for starters
or better take a carbon or glass cloth and reinforce from the leading 
edges to about 15-20cm minimum
in to the wing which is very easy to do (use a little spray adhesive on 
the wing, apply cloth and after 10 minutes apply resin or the lighter 
water based 2 component floor varnish)
In other words create a "U" reinforcement at the leading edges.
I intend to cover the wings with fiberglass cloth also.
Here is a post i found interesting:

Causes (and potential fixes) of flutter in foam planes:
1. aileron/elevon flutter (if the stock push rods and horns are used, 
there is gap and the gap lets the elevon to move and now only what is 
needed to induce the resonant frequency of the elevon and brrrr bang). 
Fix: use better pushrods and horns, with better tolerances, it is good 
if there is no play when you try to move it with your hand.
2. wing twisting (happens because it is not stiff enough) (make the wing 
more stiff, e.g. by covering it with glass fiber) The stiffness of the 
leading edge (first 50%) of the wing is most critical component in 
avoidance of wing twisting that may lead to flutter.
Chris