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. It
takes -1 G of acceleration to counter gravity and get you to 0 G. You
can then add -1.76 G of additional acceleration and still be within load
limits. The negative G load factor is referenced to 0 G, not 1 G
straight and level.

Matt