The Gnat featured all-swept wing surfaces and a clean fuselage design. Cockpit placement was forward of the fuselage design featuring a two piece glass canopy. Trainer versions featured an elongated cockpit position with two seats in tandem for student and instructor. Intakes were mounted to either fuselage side, feeding the single jet powerplant. Trainers varied in using a different powerplant, wings and empennage section. The empennage was dominated by a single vertical tail fin and conventional tailplanes. The undercarriage was of a tricycle arrangement featuring two main landing gears and a nose gear. Performance of the F.Mk 1 was impressive - considering it was all subsonic - provided for by the single Bristol-Siddeley Orpheus 701-01 series turbojet engine delivering some 4,705lbf. Maximum speed could top 695 miles per hour while a range of 500 miles was possible. A rate-of-climb of 20,000 feet per minute ended with a service ceiling of 48,000 feet. Standard armament for the base Gnat was modest, consisting of 2 x 30mm ADEN cannons. Lethality could be increased somewhat by the addition of 18 x rockets or 2 x 500lb bombs held underwing.
In practice, despite their low cost, proved to quite the needy aircraft with maintenance costs to boot. Its smallish size worked against it in terms of maintenance personnel needing to reach and repair various internal components. The aircraft suffered from limited range and limited armament potential, severely restricting its serious use as a front-line performer. These limitations ensured a limited production run spanning several decades of service though still delivering a memorable history. To drive home the point, the fighter version of the Gnat was not even utilized by the RAF - it found better success on the export market, particularly in operations under the India banner.
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