RE: Matt Chapman cap 580 .40 size
That's WAY overkill on power, guy. A .46 will fly it; a .61 is perfect, as is the .91 four stroke I'm using. But a .91 two-stroke... well, all I can say is, hang on.
It won't nose over during taxiing IF you balance it properly. Mine is just a tad nose heavy, and it is very well-behaved during ground handling, on less-than-smooth grass.