"john smith" wrote in message
...
I have been playing around making V-n diagrams for the various airplanes
I rent from my flying club.
I made one for our P28T-201RT and was looking for the numbers on the
PA32-300.

The one item for the PA32-300 that would not follow the formula for
calculating the lift line was Va. The book shows it as 132 kias, but the
formula generates a speed of 103 kias for the intercept of the 3.8
load limit line.

Can anyone explain this discrepancy?


Va is defined by what control surfaces can handle, not the
3.8g load limit line. See FAR 23.423 and 23.335. It doesn't
have to be on the lift line; it can be above it, but not below.