Simple illustration of lift can be seen in a commercial aircraft such as a 767 on takeoff. On the takeoff roll the wings are basically straight out from the fuselage. As the takeoff run continues the lift is increased and gradually applied to the wing, causing the tips to rise as the wing bends by design to handle the lifting loads. Depending on the weight the tips may rise 3-5 feet as the wing takes the lifting loads on takeoff. This clearly illustrates the lifting force in positive Gs is applied to the bottom. The fuselage is attempting by gravity to stay on the earth and the wing is lifting it up, hence positive Gs. Negative Gs is where the fuselage is repelled from the earth and/or the wing makes negative lift (such as inverted flight).
Colin & Bev Rainey KR2(td) N96TA Sanford, FL crain...@cfl.rr.com http://kr-builder.org/Colin/index.html
