Check your Vmcg.....In-particular against an artificial increase in V1 to say 120kts in Wet Conditions!! (usually only an issue on mid length R/W's)...
V1 min will decrease your screen height
V1 max will increase your screen height
PERF A.....Both should give you obstacle clearance, but do you really want to reduce your screen height (35') at shorter airlfields....?
Last edited by CAT1 REVERSION; 14th January 2010 at 17:03.