Juan Jimenez wrote:
Lou wrote:

What will this do to the loading of the aircraft?


Fuel weighs more than air and wood. At full fuel your wing loading will
increase, with all that that entails.

True, fuel is heavier than air or wood however there's a lot more to
this than weight of fuel. Assume you've got a fuel load of 120 pounds.
If that fuel was in the fuselage that weight is supported by the
wing attachment bolts. If that fuel was IN the wings, then the wing
attachment bolts are not supporting that extra 120 pounds in the
fuselage. This is the reason most larger aircraft are designed to carry
most of their fuel in the wing structure. Less stress on the wing
attachment bolts. The WING LOADING is the same assuming the weight of
the fuel remains the same. Wing Loading is simply the weight of the
aircraft divided by the area of the wing.



Does this effect the useful load and how? Does it raise my useful load or
lower it or niether?


Neither. Your aircraft has a gross weight, does it not? Useful load remains
the same, difference between empty weight and gross weight.



Since the wings create lift, and the fuel was in the fuselage and now in
the wing should it screw up the center of gravity?


Come on, you're not telling me you're building an aircraft and don't know
how to do a CG calculation? What L.D. said, do a weight and balance
calculation!