[samste]

You should actually get slightly more lift with out dihedral. because the lift force works perpindicular to the wing and if both wings are flat then the lift force vector is verticle rather than canted off at the dihedral angle, ie inward on each side. You might find that you get less effeciency with the flat wing because you have to give here more aileron inputs to keep her level, due to less positive stability in roll and that may cost you in the form of added drag.

You should'nt get as much yaw roll coupeling either. I found models with high aspect ratio wings yaw a little bit in the opposite direction to an aileron input. To counter this, if it happens, you might want to mix a little rudder in with ailerons to make her roll nice and axialy but see how she goes with out it first, you can allways set up a mix so you can turn it on & off with a switch.

Looks like a nice model and it should be even better with the improvements you've made to it !!

I gave Fournier A Maiden Today between Jobs as i was near Pemac in some gusty wind.
Took Off very easily off the ground and was up very high in the sky in a few seconds, so the power setup is Perfect.
Gave it a 1/2 dozen clicks of elevator up as i always tend to give more down elevator before a maiden and that was it.
Flew quite well.
But as mentioned by Gorden, Kev B and John H it needed some Differential mix.(Thanks Guys for the Tip on Differential)
Second Flight added in 30% Differential Mix to Ailerons and some expo and was up for a nice 10 min no problems and flew nice, even gave it a Knife Edge, some Rolls, Flat Spins, Inverted and Lots and Lots of Full Throttle


Steve