My friend is selling his u-can-do 3D 46 size but i sold all my small engines i swicht to gasonile the smalest i have is a 61 evolution and i was wondering what do u guys think this plane with a 61? im looking for 3D so ofcure i will need to move the batterie back but just in general what do you guys think>? check this video out the guy is flying with a 61 super tiger wich is heavier than the evolution ! thank you http://www.youtube.com/watch?v=-wXDutTX_RQ

Thay should work out fine, a 40 size engine will be to small for real 3-D anyway. I am going to use a .91 fs in mine when I get to assemble it.

.91 for a 56 wingspan plane i beilive is an over kill!

It will rock as long as the 61 is used for power and not speed.

haha thank you awsome! and what happen if i renforced the plane for speed with the 61? where can i renforced the wings and how?

you would need some good servos and 4-40 ball linkages to eliminate possible flutter....

Flutter is the issue. You can use good servos ,seal your hinge line, but the best thing you can do is only use full throttle on vertical up lines and not in level flight or down lines

go it thank you

A long 4 pitch prop will keep you safe in power dives.

Yep, low pitch helps. Maybe a an APC 14x4

14x4 is the way to go thank you guys