The HR.100 first flew in April 1969, and is in essence a development of the DR.253 Regent with metal construction. The first production variant was the HR.100/180 with the 134-kW (180-hp) Avco Lycoming O-360, but this was soon replaced by the HR.100/200. In 1971 Avions Pierre Robin placed in production its first all metal aircraft, the HR 100/200, designed by M Christophe Heintz. The HR.100/320/4+2 up-engined variant for two children as well as four adults failed to progress past the prototype stage, so the next model was the HR.100/ 210 with a 157-kW (210-hp) engine.
At this stage retractable landing gear and Continental engines entered the picture to produce the HR.100/285 with the 239-kW (285-hp) Tiara: this model entered production with the Tiara 6-285B version of the engine. The HT 100/Tiara, first flown in 1972, featured redesigned wings and vertical tail. This basic model was also produced in the HR.100/250TR version with the 186-kW (250-hp) Avco Lycoming IO-540 engine.
HR 100/200
Engine: Lycoming IO 360 A1D6, 200 hp
Prop: 6 ft 11 in (1.87 m) dia 2 blade metal
Wing span: 29 ft 6.25in (9.00 m)
Length: 24 ft 1 in (7.34 m)
Wing area: 155.0 sq ft (14.40 sq.m)
Gross weight: 2.645 lb (1,200 kg)
Max cruising speed: 155 mph (250 kph) at SL
Max range: 750 miles (1,210 km) std fuel
Seats: 4
Undercarriage: fixed
No built: approx. 30
HR.100 Royal 210F
Engine: Continental IO-360-D, 210 hp
Wingspan: 29 ft 9.5 in / 9.08 m
Length: 24 ft 3 in / 7.39 m
Empty weight: 1565 lb / 710 kg
MTOW: 2755 lb / 1250 kg
75% cruise 8000ft/1440m: 146 kt / 168 mph / 270 kph
ROC: 1000 fpm / 305 m
Service ceiling: 16,400 ft / 5000 m
Range 75% pwr 8000ft/1440m std fuel: 739 nm / 850 mi / 1370 km
Range 75% pwr 8000ft/1440m aux fuel: 1457 nm / 1675 mi / 2700 km
Seats: 4
Undercarriage: fixed
HR.100 Royal 210R
Undercarriage: retractable
HR.100/285
four-seat sport and touring lightplane
Powerplant: 1 x Teledyne Continental Tiara 6-285B, 239kW (285 hp)
Span: 9.08m (29ft 9.5 in)
Length: 7.59m (24ft 10.75 in)
Max TO weight: 1400 kg (3,086 lb)
Max speed: 202 mph at sea level
Operational range: 1,323 miles
HR.100/Tiara
Engine: Teledyne Continental Tiara 6, 320 hp
Seats: 5
Undercarriage: retractable
All Aero 