Handley Page Heyford - Variants

Variants

Heyford I
Powered by 575 hp (429 kW) Rolls-Royce Kestrel III engines: 15 built, serial numbers K3489-K3902 (last aircraft built as Mk.II prototype).
Heyford IA
Engine support changes, power-driven generator, four-blade propellers: 23 built, serial numbers K4021-K4043.
Heyford II
Powered by 640 hp (480 kW) Kestrel IV engines: 16 built, serial numbers K4863-K4878.
Heyford III
Supercharged 695 hp (518 kW) Kestrel VI engines: 70 built in two batches, serial numbers K5180-K5199 and K6857-K6906.

For a total of 125 (including the prototype, J9130)

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