Variants
- HD.31 - prototype with Wright Cyclone C7BA1 radial engines (1 built)
- HD.32 - prototype with Pratt & Whitney R-1830 radial engines. (2 built)
- HD.321 - prototype with Wright Cyclone 982 engines and single fin. (2 converted from HD.32 by replacing twin fins with a single central and two small auxiliary fins)
- HD.324 - turboprop version with Rolls-Royce Dart engines. (not built)
- HD.33
- HD.331 - projected militarised version for use as troop transport or air ambulance. (not built)
- HD.34 - aerial survey version for IGN. (8 built) Retractable, off-set nosewheel.
Read more about this topic: Hurel-Dubois HD.31
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