Wow...digging up an old thread....

I should think the plane would fly just fine with the .70...not a power house or a 3D monster, but it should fly fine...
I have run a Magnum .91 and a Saito 1.00 in mine... and it flies (well....Duh, but you know what I mean).......

about the only time I need full throttle is when I am pulling out of a spastic hover (well gimme a break I'm still learning)
or when I need an endless upline......

but for basic flying around, the .70 would be fine....
the plane floats very well.... takes off quickly....

Worst case..fly it with the .70, enjoy it, but if you feel it isn't enough...put a bigger engine on later......