Greetings all!

I'm currently buildind a Sig Somethin' Extra and I'd like some advice from anyone who's built one or who can give me an engineer's point of view...

1. The plug in wings are quite sturdy (sheeted D-box) but with the double ply sandwich root rib they seem a little heavy. Is this doubling of heavy ply in the root overkill, and would it hurt if I made some (strategic) lightening holes in one or both? The only reason I can think of that these root ribs should be solid (no holes) is for good adhesion in the (max. surface area) in the build...Am I missing something here?

2. Should the firewall (bulkhead) be set back a little to accomodate a longer saito 56 4-stroke?

3. Can two servos be put down the tail for rudder & elevator if the plane is building nose heavy? (I'm doing built-up tail feathers and ailerons instead of the stock slabs of balsa, so it should build out a little nose heavy)

Any advice on these questions will be greatly appreciated...thanks in advance

inverted flyer [sm=drowning.gif]