Slasher:
(This is also in the case of a SID, in which the procedures are
designed with a continuous climb in mind. However in any SID
there is nothing to stop a driver from arranging his flight to
include an acceleration altitude as long as its been calculated
correctly. All that has to be accomplished is that the aircraft
remains above the Procedure).
Indeed so, which is a very complex calculation that only professional performance engineers can perform. The result is often an OEI "escape" flight path that deviates from the SID.
FAA AC 120-91 is required reading for anyone with a serious interest in this subject. Although written for performance engineers is provides an overview for pilots.