thrust line for engine and not mounting engine on this thrust line

Forces and moments are balanced in straight flight. The net center of
lift (slightly ahead of the main wing CL) is the sum total of tail and
main wing lift and is opposite to CG force and at same point. The tail
lift is negative. When rotating up the net lift is forward of CG, when
rotating down the net lift is behind of CG.

For canards both wings lift - that gives a slight efficiency edge to
the design.


Ernest Christley wrote:
The CG must be just forward of CL or you risk not being able to pull the nose
up on takeoff (if it is to far forward).........