Arado Ar.80

The Arado Ar.80 a German pre-World War II fighter airplane designed by the chief engineer Walter Blume and manufactured by the Arado Flugzeugwerke in order to compete for the first major Luftwaffe fighter contract. It wasn't well received due to its disappointing performance and number of failures. The contest was eventually won by the Messerschmitt Bf.109 and the Ar.80 was used as a test aircraft.

It was completely made out of metal with a reverse-gulled cantilever low wing and a fixed undercarriage. The first prototype was powered by a 695hp Rolls Royce Kestrel V engine. The first prototype was destroyed when it crashed.
A second prototype was built powered by a 525hp Rolls Royce Kestre VI engine but it was soon replaced by a 640hp Junkers Jumo 210ca.
The third prototype, named V3, was also powered by the same Junkers Jumo 210ca and was the first prototype to be armed with one engine mounted 20mm cannon and two 7,92mm MG 17 machine guns in the engine cowling. It was also fitted with a revised wing that eliminated the inverted gull arrangement and was later modified as a two-seater trainer.
The fourth prototype, named V4, was powered by a fuel-injected Junkers Jumo 210Ga and featured an enclosed cockpit and this one, together with the fifth prototype, the V5, underwent extensive testing in Rechlin in order to test new flying instruments and in Tarnewitz later, in order to test the armament. It was returned to Arado to defend the company's airfield at Warnemünde.

A production version powered by a Junkers Jumo 210Ea and fully retractable undercarriage was discontinued when the Bf.109 was selected as the winner of the contract.

Sources:
1. https://en.wikipedia.org/wiki/Arado_Ar_80
2. Salamander Books - The Complete Book of Fighters
3. http://histaviation.com/ar_80.html