Cossack - One thing to mention is that on take off, many aircraft will not be clean if asked to fly 210Kt. Even my 737 when departing over 53T is unable to do this, and the DC10 is another matter still I believe.. .. .On a 737 - At our accel alt (we use 1500' but some fleets will use 1000') the speed cursor will drive to 250kt, and the aircraft accelerated through flap retraction. It is not uncommon to be 250kt by 3000'.. .. .Most SID speed restrictions that I have found are mostly to do with a tight turn after departure, requiring a smaller radius of turn. Examples that spring to mind are DUS and ARN.