Larry Dighera wrote:

On Sun, 23 Jul 2006 14:00:37 GMT, Matt Whiting
wrote in ::


Larry Dighera wrote:


On Sun, 23 Jul 2006 01:54:35 GMT, Matt Whiting
wrote in ::



Flight load factor

Flaps up = +4.4 G's and -1.76 G's


So, in inverted flight a C-172 has only a 76% of a G margin to carry
additional G force. That isn't much.

Thanks.

No, 176% of a G.


No. A _margin_ of only a 76% of a G to carry G forces in addition to
the one G natural force.

When you are pulling negative G, there is no one natural G force.


While you are in the vicinity of the Earth, your aircraft is being
acted upon by the Earth's one G gravitational force.

If you are flying straight and level while inverted, the airframe is
experiencing -1G, not 0 G.

That provides the remaining 0.76 (76%) of a G of the C-172's negative
load factor specification of -1.76 to carry the load of any
acceleration that may subsequently occur.

If you had said 76% of a negative 1 G, I'd have agreed with you. :-)
Just saying of a G, implies positive 1 G by most conventions.

Matt