The problem of a rolling start (apart from FOD etc considerations) is one of acceleration variations.
On a longer runway at higher commercial RTOW, especially for hot and high conditions, the acceleration is comparatively modest with the result that the aircraft hasn't gone a great distance before the spin up puts the engine at takeoff thrust .... in such cases there is little to worry about.
However, on a short runway at limiting (comparatively light) RTOW, especially for low and cold conditions, there may be a measurable problem in that the acceleration at part thrust settings may be significant. This may then result in the aircraft's having proceeded some distance down the runway prior to the spin up reaching takeoff thrust. In such circumstances, there is the possibility that the rolling takeoff may compromise the sums.
Most operators would get around this problem by doing a few sums and prescribing a below RTOW tolerance within which more rigorous attention to technique is required .......
Last edited by john_tullamarine; 11th August 2002 at 01:26.