Editing Heinkel He 112 (section)

===Prototypes===

The first [[prototype]], V1, was completed on 1 September 1935.{{sfn|Wilson|2007|p=214}} Specifications of the Technisches Amt required that the competing aircraft be fitted with the [[Junkers Jumo 210]], however, as the engine was unavailable,{{sfn|Mantelli|Brown|Kittel|Graf|2017|pp=14 & 59}} a {{convert|518|kW|Hp|abbr=on}} [[Rolls-Royce Kestrel]] V was fitted instead.{{sfn|Forsgren|2017|p=}} The V1 prototype of the Heinkel had comparatively large wings and was heavier than its contemporaries, however, due to the wing size, the mass was more evenly spread out resulting in lower wing loading. The upshot of this was that the aircraft had better turn performance; the down shot was that it generated more drag than expected and had a slowed roll rate.{{sfn|Owen|2015|p=1 c.7}}{{sfn|Forsgren|2017|p=}}

The second prototype, V2, was completed in November. It was powered by a {{convert|480|kW|Hp|abbr=on}} Jumo 210C engine and fitted with a three-blade propeller but was otherwise identical to the V1. Meanwhile, the data from the V1 factory flights was studied to discover where the unexpected drag was coming from. The Günter brothers identified the large, thick wing as the main culprit, and designed an entirely new smaller, and thinner wing with an elliptical planform. As a stop-gap measure, the V2 had its wings clipped by {{convert|1.010|m|ftin|abbr=on}} to allow it to compete with the 109.{{sfn|''Air International''|1989a|p=232}} This made the He 112 creep over the [[wing loading]] requirements in the specifications, but with the 109 way over the limit, this was not seen as a problem, and the V2 was sent off for testing.{{citation needed|reason=no source given|date=October 2017}} The V2, like its predecessor, had problems with spin stability and eventually crashed and was destroyed when test pilot Gerhard Nitschke bailed from the aircraft after losing control during a set of spin tests.{{sfn|Owen|2015|p=1 c.7}}

The V3 took to the air in January. Largely similar to the V2 and powered with the same engine, the V3 had minor changes including having a larger [[Radiator (engine cooling)|radiator]], fuselage spine, and [[vertical stabilizer]], having a single cover over the exhaust ports instead of the more common "stack", and also including modifications to allow armament to be installed in the [[cowling]].{{sfn|''Air International''|1989a|p=233}} The V3 was the first prototype fitted with armament in the form of two {{convert|7.92|mm|in|abbr=on}} MG17 machine guns.{{sfn|Jackson|2015|p=16}} It was later modified once more to include a sliding canopy and a new fully elliptical wing.{{sfn|Jackson|2015|p=16}} It was expected to join the V2 in testing but instead was assigned back to Heinkel in early 1937 for tests with rocket propulsion. During a test, the rocket exploded and the aircraft was destroyed, but in an amazing effort, the V3 was rebuilt with several changes, including an enclosed cockpit.{{citation needed|reason=no source cited|date=October 2017}}