On Fri, 01 Dec 2006 07:40:00 +0100, Mxsmanic wrote:

Neil Gould writes:

A design defect is a problem caused by some aspect of the design. I don't
know why you would consider the effects of propeller propulsion to be
"design defects". They are simply aspects of that type of propulsion.

An aspect of propulsion that constantly pulls the aircraft to one side
sounds like a defect to me.

No more than the fact that you can't pull the nose of a General Aviation up to a
90 degree angle and keep climbing. Designers *can* build airplanes that will do
this, but the cost/benefit tradeoffs usually preclude it. Similarly, the
P-factor effect is accepted in some cases in order to minimize the production
cost. A design defect is something unexpected that becomes apparent AFTER the
aircraft flies, not something that is known and recognized while the plane is
still on the drawing board.

Ron Wanttaja