I got into a link at some post about what not to do
http://members.cox.net/moormanrc1/RC181DoNotRules.htm
http://members.cox.net/moormanrc1/RCUCatalog.htm
he says not to round the Trailing Edge of any control surface if its done it will flutter and who tells you to do this haven't flown his airplanes fast enough or overpower them.
"# Do not round off the trailing edges of any control surface.
This promotes flutter. Check any book on aerodynamics. If someone tells you it's OK to round off trailing edges, he is absolutely wrong. He just hasn't flown his planes fast enough. DO NOT ROUND OFF. Don't even sand it slightly round. Sharp corners reduce the tendency to flutter. Be wary of kits where the control surfaces have rounded trailing edges. If you over power this airplane and get the speed up too high, it will flutter. "
As I look at the instructions of Goldberg chipmunk the elevator and the rudder TE's are rounded, in sig 4*60 all control surfaces TE's are rounded including ailerons.
then about Cool Power except for break in my engines most happy with green cool power.
# Do not use all-synthetic fuel in ABC/ABN engines.
ABC and ABN engines need some castor oil in the fuel. Morgan Fuels, one of the leading fuel manufacturers, makes green Cool Power, all-synthetic fuel. They also make pink Omega, a castor-synthetic blend. Quoting from their advertisement under Cool Power Total Synthetic fuel, "For general use in Glo engines with rings. (For A.B.C. and A.B.N. engines, we recommend Omega)." Since they go to the trouble to make two different fuels, why go against their recommendations.
who is wrong?