dredmoody(at)cox.net
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 Posted: Tue May 15, 2007 9:09 am Post subject: flying over gross |
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Seems like straightforward physics to me. 1G means one gravitational acceleration force on the weight (mass) of the plane. If that weight is 1200 pounds the wings are supporting 1200 pounds at 1G. If it's 200 pounds heavier, the wings support 1400 pounds at 1G. Now at 3Gs the first plane's wings are supporting 3600 pounds and the secong one is supporting 4200 pounds. The difference in load on the wings is 200 pounds at 1G but 600 pounds at 3Gs.
When you talk about flying at 1G, I expect you realize that you can't actually do that for an entire flight.... you are constantly accelerating and decelerating in various directions the whole time. Therefore the question is irrelevant. The average Summer day around SW Louisiana includes a lot of 2.5 to 3G turbulence even if I don't accelerate the plane at all.
Bottom line is go with what the designer established to allow you a margin of safety.
Dred
Do Not Archive
Do Not Second Guess the Designer
---- john butterfield <jdbutterfield(at)yahoo.com> wrote:
| Quote: |
hi list
not sure about the wing design, but have been
wondering about the real effect of flying "over" the
max gross weight. i know we set the max ourselves,
but what is the real effect on the aircraft if you fly
over weight within the cg limits. i know many people
add a little weight when they fly. it seems to me
that since we set our own limits, what is the
ralationship between g forces and weight conditions.
likely, you will lose some performance and reductions
of you max g limits, but as far as strength goes, if
you fly at 1 g, it should not be a problem.
i am sure my question is improperly stated, but what
really happens if your machine is very heavy.
john butterfield
601XL, corvair
torrance, ca
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