On Tuesday, August 16, 2016 at 2:39:21 PM UTC-5, 6PK wrote:
Vulgar downwind dash"? ?
I don't know what you are referring to.
Straight out flights, at least anything more than a 100k, will be of constant different and changing conditions.
After all that is what it's all about.

Old school term. Look at the writings of Phillip Wills.