RE: How many squares would you say...
Ray,
Unless you are building it with profile nacelles, those 3 1/2 props will need
to function as ducted fans to get any thrust!
There WAS a "paper" version of the XF5F with more streamlined nacelles
and a spinner, but it would be a "scale" model of a plane that was never built.
(I drew up a 42" span XF5F for two Cox .09's when I was a teen, never built
it though.....ah, another someday project... Inspired by an old '40's issue of MAN
I had back then with a Skyrocket on the cover and a nice 3-view inside.)
Get the CG in the right place, it should fly! You will win the smallet XF5F award
for sure it it does.
If I can find my 3-view that shows the streamlined SKYROCKET, I can post it if you are
curious.
Dave