Gustlines
 

Maybe you guys can help with this question:

Where do all the gust lines originate on the vn diagram?

a. v=0 n=0
b. v=vs n=0
c. v=vb n=+1
d. v=0 n=+1

The answer is supposed to be (a), but there seems to be some doubt as someone has pointed out that on a gust envelope diagram all the gust lines cross at v0 n+1.

A word from the wise men?

d.

cheers!

Stuck