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Proposed purpose-built single-seat high-altitude research
monoplane with retractable undercarriage and a supercharged Pegasus powerplant. Not built.
Purpose-built single-seat high-altitude research monoplane to meet the requirements of Specification 2/34, capable
of carrying an observer when necessary. One 500 h.p. Bristol Pegasus P.E.6S powerplant.
Two-seat development of the Type 138A powered by a 500 h.p. Rolls-Royce Kestrel
S powerplant fitted with a similar two-stage supercharger installation.