The final Parnall aircraft was an open two-seater trainer derivative of the Heck to Air Ministry Specification T.1/37 named the Parnall 382, later the Heck III.
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Defence was provided by a Scarf-mounted Lewis gun in the observer's cockpit at the upper wing trailing edge while the pilot had a forward-firing Vickers machine gun.
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The observer was equipped with a Scarff ring and had an uninterrupted field of fire as the fin and rudder were mounted beneath the fuselage.
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Parnall received large orders from the Admiralty to build aircraft designed by other manufacturers, principally the Avro 504 and Short Admiralty Type 827 (of which 20 were built).
After the failure of the Pipit, Parnall never got a production order for a military aircraft and never submitted a front-line prototype again, though they did compete for the trainer specification Air Ministry specification T.1/37 with the Parnall Heck III.