Originally Posted by
santiago15
I believe Woof etc was originally asking 2 questions:
a) Why would you have a different V1 for a wet runway?
b) Why would you have a reduced screen ht (15' as opposed to 35')
I believe I answered both of those questions:
a) Because of degraded braking.
b) Beacause of a greater TORR.
S15
So, the question b) is somewhat answered, but not quite.
If you make performance calculations for a runway that is dry, and find you cannot clear 35 feet screen, you are not allowed to attempt takeoff. Not unless you unload the plane to the point where it can clear 35 feet.
If the runway counts as wet, you are allowed to clear the screen by 15 feet. You do not have to unload the plane until it can, starting from the wet runway V1, clear the screen by 35 feet.
Why?