CG info.
03-31-2007, 09:50 PM
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CG info.
Sal,
I have a question about CG, is it a function of the wing only, or is it determined from the entire overall plane specs. I am flying a 1.6M elec glider, with a balsa wing, and a fiberglass fuselage. The fuse has taken its share of damage, but seemed to easily damaged, so I got out my 2oz cloth and finishing resin and layed up a coat on the outside of the fuse. It is really strong now with little weight gain, but did I change the CG, which was 50-55MM behind the leading edge. If I have how do I determine the new CG. thank You Roger
I have a question about CG, is it a function of the wing only, or is it determined from the entire overall plane specs. I am flying a 1.6M elec glider, with a balsa wing, and a fiberglass fuselage. The fuse has taken its share of damage, but seemed to easily damaged, so I got out my 2oz cloth and finishing resin and layed up a coat on the outside of the fuse. It is really strong now with little weight gain, but did I change the CG, which was 50-55MM behind the leading edge. If I have how do I determine the new CG. thank You Roger
04-01-2007, 12:55 PM
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RE: CG info.
If you know the original CG that you had before you repaired the sailplane, balance back to that CG and it will fly just like before. (perhaps a little faster due to added weight, but it's likeley that small amount will have no discernable effect).
We will try ot keep this disscusion reasonably simple, so essentially the FLYING CG is a function of the planform, which includes predominately the wing shape, airfoil, angle of incidence of the wing/tail. (lesser factors are fuselage length, and size and area of the horizontal stab and airfoil of the horizontal stab), tail moment, and front fuse length. Basically, the CG is primarily a function of the airfoil. The actual physical location as measured at the root of the wing (near the fuselage) is a function of all other factors.
We will try ot keep this disscusion reasonably simple, so essentially the FLYING CG is a function of the planform, which includes predominately the wing shape, airfoil, angle of incidence of the wing/tail. (lesser factors are fuselage length, and size and area of the horizontal stab and airfoil of the horizontal stab), tail moment, and front fuse length. Basically, the CG is primarily a function of the airfoil. The actual physical location as measured at the root of the wing (near the fuselage) is a function of all other factors.
