For a year or so I've been thinking about a twin RC model. I've only built one twin, many years ago. It was a CL P-38 that I designed, powered by two cox .010's. It flew surprisingly well. I have no other experience with twins.
I've ridden in a number of PBY's (its a beautiful plane), and that seems to be a good, logical first twin.
It's a large, slow, high wing, with engines very close together, it wasn't too far from a powered glider. I think it cruised at about 100kt. and landed at 80kt.
I have four engines that I like, two are PAW .19 "diesels", and two "pre China" ST-.34's. and I'm wondering about the size of the plane if I try to build light, and fly in a scale manner.
Pulling some numbers from the ether via Mr. Lennon I'm guessing at the following;

Power..........................2 @ .19 diesel @ 6.5 oz. ea.
Props ..........................10X4 (recommended)
Weight ....................... 6.25 lb. = 100 oz.
Wing loading ................0.14 oz./sq. in. =20 oz./sq. ft
Wing area.....................720 sq. in. (5 sq. ft.)
Lift. coeff. ...................1.00

Construction:
Built up fuselage and tail; wing built up partially sheeted or sheeted foam,

Haven't looked at airfoils yet but I should be able to find one that will give a lift
coefficient of 1 at 20-25 mph.

I'll appreciate any comments and suggestions.

Thanks