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By M. Arjomandi, N. K. Liseytsev

Plane layout three (2000) forty nine - fifty six

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Extra info for A simplified method for estimating the take-off weight for short-haul transports

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But arguably the most important contribution came from the increase in training aircraft, the total on hand rising from 700 to almost 7000 over the same period. Production rates were slow to begin with, the AAF receiving on average fewer than 100 aircraft a month during 1939, the monthly acceptance rising to 250 in January 1941 and more than 800 in December. Throughout 1941 these rates continued to increase, from around 1000 in January to 2500 at the end of the year. The Air Forces wanted combat aircraft but the production quota for those was slowed by the priority requirement for new aircrew and by Lend-Lease which saw the number of B-17s delivered rising from only 22 in September 1939 to almost 200 in December 1941.

USAF ABOVE: The Stearman Kaydet, a name applied from 1941, was designed in 1934 as a private venture, modified into what would become the most recognised, and valued, US trainer in the inventory, bearing the prefix PT with a variety of type numbers. Boeing bought out the company in 1934. This example is the last of 10,346, used by Boeing in Wichita for publicity and bears the civilian registration. BOEING the conflict, turning to morale-busting night bombing as an attempt to wear Britain down. The losses to the Luftwaffe were critical and it took many months for it to get back up to strength.

Sizing meant a great deal and biggest was certainly not always the best. Larger aircraft cost more which meant fewer could be bought within the discretion of a fixed budget. Moreover, bigger aircraft were more expensive to operate and within the technical limits of reciprocating 34 engines they would probably be slower. The power-to-weight ratio was just too low. There were other factors that the Air Corps had to consider too, balancing the cost/ vulnerability equation: bigger aircraft with their higher operating cost would be slower and therefore probably have less chance of surviving attack from the upcoming generation of fast fighters.

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A simplified method for estimating the take-off weight for short-haul transports by M. Arjomandi, N. K. Liseytsev

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