Variants
- XPH-1
- Prototype. Two 537 hp (401 kW) Wright R-1750 engines. One built.
- PH-1
- Production version for U.S. Navy. Partly enclosed cockpit for pilots. Two 620 hp (463 kW) Wright R-1820-86 engines in short-chord Townend ring cowlings. Nine built.
- PH-2
- Version for U.S Coast Guard. Two 750 hp (560 kW) Wright R-1820F-51 engines. Armament omitted. Seven built.
- PH-3
- Improved version for Coast Guard. Long Chord NACA cowlings. Revised enclosed canopy for pilots. Seven built.
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