108 inch C130, wow, big project!
I have been interested in multi engine models & built 3 with IC engines which was successful
but messy & hard work.
The coming of practical electric power really was a godsend, everything instantly became easier,
cleaner, more reliable & fuss free. That was 20 years ago, electric power has become 10 times
better since then!
This is the model I would like to say I'm flying at the moment but I stuck it in a tree at an unfamiliar
field & damaged it quite a bit getting it down. Fortunately, the most complex part, the wings, escaped
1/ It, like yours, has a modified flat bottom wing which works fine. The span is 110 inch & is in one piece,
if you can store & transport a one piece wing it will be lighter & more convenient to use. Mine also has
I beam spars with hardwood top & bottom plates & balsa webbing. The spars are tapered along their
length to reduce weight. The centre join uses plywood joiners but a triangular box is built in the middle
to allow for the wing sweep. My batteries, flight & radio, are in the fuselage, necessary because the motors
hang off the trailing edge of the wing.
2/ Power plants - For glow engines you probably need less power than you think, the amount of propeller
area is the key. To give you an idea I still have a 100 inch B-29 which used a pair of OS 40's & a pair of
OS 20's. These were basic engines (FP series) & not very powerful but heaps of power for a model weighing
15 pounds + fuel. The B-36 uses 6 geared 400 brushed motors, about the equivalent of single 25! It presently
weighs about 10 pounds with batteries, a change to lipo's saved a pound & gave more power.
Have a serious think about electric power, lighter, simpler, cleaner, more reliable, cheaper, no fuel proofer required
over paint, no mufflers to try to hide, no needle valves sticking out, no fuel filler tubes or filters, no fuel tanks, no
throttle linkages, much much less maintenance & the model will be as easy to operate as your toaster. No fuel bills
either although no one will claim the batteries last forever.
A big advantage is no vibration or stresses when using an electric starter. Everything can be lighter & simpler.
It's really a no brainer these days to use electric power for models like this. Good luck!