The practice I used for many years when a balanced field length was involved on a dry runway was to extract the V1 from the performance card and then expect to be 35’ over the end of the runway if an engine failed at V1. If the runway was wet and the same balanced field length was involved ( making stopping more critical ) then I reduced the V1 by a maximum of 10 kts. This now means that if an engine failed at the reduced V1 the aeroplane is required to accelerate on the ground on three engines to VR. The result is not 35’ at the end but 15’. The company I worked for fully approved this procedure and considered it the Captains’ prerogative. I've often wondered if this procedure would work for the " Big Twins "?
KIFIS