Well panzer.. you got the MAmmoth size explained for us
[&:]
Besides the size of the wing, there are also weight restrictions. In the USA you can't fly anything over 50 lbs without FAA aproval and special permit. I think across the channel you can go up to 100 lbs without a permit, but you have to register your license or something to that effect, because over that weight they are treated as full size airplanes with the regulatons.
Down here in Honduras.. there are no regulations.. but no mammoths either