IT has long been a subject of comment at Martlesham Heath that practically all the aircraft put through performance trials there take approximately the same time to reach the service ceiling—about 40 minutes.
Hutchinson, J.L. (1932), "Climb and Service Ceiling: Over a Wide Range of Aeroplane Types Time to Ceiling is practically Constant", Aircraft Engineering and Aerospace Technology, Vol. 4 No. 8, pp. 203-203. https://doi.org/10.1108/eb029580
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