Specification F7 / 41 required a minimum speed to 415mph at 33, 000ft with a maximum ceiling of 42, 000ft . The Air Ministry also wanted low altitude manoeuvrability and a + 9G ultimate load factor.
12.
On 23 February 1939, the " Regia " authorized production of 32 Z . 1018 aircraft, but stipulated an ultimate load factor of 9.0, and also demanded construction of a prototype, and further required that production deliveries begin before the end of the year.
13.
The ultralight version has an ultimate load limit of + 5 /-2.7 g and an operational limit of + 3.8 /-1.8g, while the homebuilt version has an ultimate limit of + 5.7 /-5.7g and an operational limit of + 3.8 /-3.8 g.
14.
The Comet's pressure cabin had been designed to a safety factor comfortably in excess of that required by British Civil Airworthiness Requirements ( 2.5 times the cabin proof test pressure as opposed to the requirement of 1.33 times and an ultimate load of 2.0 times the cabin pressure ) and the accident caused a revision in the estimates of the safe loading strength requirements of airliner pressure cabins.
