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Grigorovich TB-5 : ウィキペディア英語版 | Grigorovich TB-5
Grigorovich TB-5 ((ロシア語:Григорович ТБ-5)) was an experimental heavy bomber designed and tested in the Soviet Union in the early 1930s. Designed as a competitor for TB-3, TB-5 was intended to be powered by two FED 24-cylinder X engines of 746 kW (1,000 hp) each. When these were canceled, the underwing pods were revised to each house a pair of Bristol Jupiter engines in a push-pull configuration. Despite projected performance inferior to TB-3, it was hoped that TB-5 would gain an advantage by using less metal (in short supply at the time) thanks to its mixed construction of fabric-covered metal frame.〔 Test flights began on 1 May 1931 with disappointing results, in part due to poor thrust of the rear-facing engines.〔 The prototype TB-5 was wrecked in a crash landing following the in-flight detachment of an engine in Spring 1932,〔Gunston 1995, p. 91.〕 and with the entry into service of the superior TB-3 that year, the TB-5 project was abandoned.〔 ==Specifications (TB-5)==
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