Improved prototype of the HRP-1 Type series used for U.S. Navy trials and for static and dynamic tests. 2 were built.
The XHRP-1 was noticeably different from the XHRP-X by having a more bowed, curved windscreen (see link).
VTOL type: Helicopter
Lift configuration: Tandem (Fore/aft) (x2)
Crew required: 2
Crew seating: Other
Landing gear: Wheels (non-retractable)
Overall Height: 4.15 m (13.6 ft)
Overall Length: 25.70 m (84.3 ft)
Overall Width: 12.50 m (41.0 ft)
Total number of engines: 1