Variants
Pentecost HX-1 Hoppi-Copter (Hoppi-Copter 100) original back-pack version.
Hoppi-Copter 101 equipped with a seat and landing gear, proved that more development was necessary.
Hoppi-Copter 102 framed, with seat for pilot.
Hoppi-Copter 103 as the 102, but lighter with a more powerful engine and slightly greater rotor diameter
Hoppi-Copter 104 as the 103, with even greater rotor diameter
Hoppi-Copter Firefly
Specifications (Hoppi-Copter 102) Data from Jane's All the World's Aircraft 1948[4]
Crew: One
Empty weight: 173 lb (78 kg)
Gross weight: 363 lb (165 kg)
Powerplant: 1 × Unknown 750 cm3 (46 cu in) two stroke flat twin, 35 hp (26 kW) at 4,500 rpm; 9.1:1 reduction gearing to rotors
Main rotor diameter: 2× 16 ft (4.9 m)
Main rotor area: 402 sq ft (37.3 m2) total
Performance
Maximum speed: 96 mph (154 km/h, 83 kn) all performance figures estimated
Endurance: 1 hr at cruising speed
Service ceiling: 12,000 ft (3,700 m) hover
Disk loading: 1.8 lb/sq ft (8.8 kg/m2)
Specifications
Data from NASM : Hiller YROE-1 Rotorcycle[9], Jane's All the World's Aircraft 1958-59
General characteristics
Crew: 1
Length: 12 ft 6 in (3.81 m)
Height: 7 ft 6 in (2.29 m)
Empty weight: 309 lb (140 kg)
Gross weight: 562 lb (255 kg)
Fuel capacity: 9.1 US gal (8 imp gal; 34 l)[citation needed]
Powerplant: 1 × Nelson H-63 4-cylinder air-cooled 2-stroke horizontally-opposed piston engine, 40 hp (30 kW)
(later 43 hp (32 kW) Nelson YO-65-2)
Main rotor diameter: 18 ft 6 in (5.64 m)
Main rotor area: 268.8 sq ft (24.97 m2) 2-bladed main rotor
Blade section: NACA 0015
Performance
Maximum speed: 70 mph (110 km/h, 61 kn)
Cruise speed: 52 mph (84 km/h, 45 kn)
Range: 166 mi (267 km, 144 nmi) with 170 lb (77 kg) pilot and 86 lb (39 kg) of fuel
Service ceiling: 13,200 ft (4,000 m)
Hover ceiling IGE: 9,200 ft (2,804 m)
Rate of climb: 1,160 ft/min (5.9 m/s)
XRON-1 Prototype
YRON-1
Powered by a 55 hp (41 kW) 4-stroke Porsche YO-95-2 model Model GP-702/1 600cc variant with 17 ft (5 m) diameter rotors.
Powered by a 55 hp (41 kW) Solar YT62 turbine model with 17 ft (5 m) diameter rotors.
Powered by a 72 hp (54 kW) 4-stroke Porsche YO-95-6 engine variant - Rotor diameter increased to 20 ft (6 m), 5 units built and tested at NAS Patuxent River and Camp Pendleton.
Powered by a 62 hp (46 kW) Solar T62 gas turbine engine and 15 ft (5 m) diameter rotors
Specifications Data from Jane's All The World's Aircraft 1961–62
General characteristics
Crew: 1
Length: 11 ft 6 in (3.51 m)
Empty weight: 550 lb (249 kg)
Gross weight: 832 lb (377 kg)
Max takeoff weight: 906 lb (411 kg)
Powerplant: 1 × Porsche YO-95-6 4-cylinder air-cooled horizontally-opposed piston engine, 72 hp (54 kW)
Main rotor diameter: 2× 20 ft (6.1 m)
Main rotor area: 314 sq ft (29.2 m2)
Performance
Maximum speed: 78 mph (126 km/h, 68 kn)
Cruise speed: 60 mph (97 km/h, 52 kn)
Range: 55 mi (89 km, 48 nmi)
Ferry range: 112 mi (180 km, 97 nmi) (overload weight, auxiliary fuel)
Service ceiling: 12,400 ft (3,800 m)
Rate of climb: 1,140 ft/min (5.8 m/s)
