I'm not sure of the scale...I would guess roughly 1/3.

These guys build their big planes from a high density foam, so their is really very little ply/balsa in the plane.

I was told, but can't verify because I wasn't at the field when these pics were taken, that the corsair has a 250 cc inline twin cylendar gas engine. When I see Bob (the builder of the corsair) at the field tomorrow I'll ask him what size motor he has in it.