The Handley Page H.P.20 was an experimental monoplane built to study controllable slots and slotted ailerons as high lift devices, and it was the first aircraft to fly with controllable slots. It was a modification of a de Havilland DH.9A that kept the biplane's engine, fuselage and tail but took an entirely new thick, semi-cantilever high wing, with full-span slats hinged ahead of the wing and slots that opened in front of the ailerons when they were lowered. Frederick Handley Page held the master patent for controllable slots from 24 October 1919, and Gustav Lachmann, working at the Goettingen wind tunnel, acted as consultant. The Air Ministry met the cost. It first flew with slots closed on 24 February 1921 at Cricklewood and about a month later with controllable slots, once landing at 43 mph (69 km/h). After a heavy landing during acceptance flights it stayed at Cricklewood for repairs until final delivery in February 1922.
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Source Handley Page H.P.20 (Wikipedia)
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Source Handley Page H.P.20 (Wikipedia)Lead, builderQuote, Lead, builder
The first aircraft with pilot controllable slots, designed by Handley Page and wind tunnel tested by Lachmann was called the X.4B in the company's contemporary notation but became, retrospectively, the H.P.20.
Sources
1. Handley Page H.P.20 (Wikipedia)
Development, first flight
The H.P.20 was first flown with slots closed on 24 February 1921 at Cricklewood.
Lead, builder
The first aircraft with pilot controllable slots, designed by Handley Page and wind tunnel tested by Lachmann was called the X.4B in the company's contemporary notation but became, retrospectively, the H.P.20.
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