Waco E series / ARE Aristocrat / HRE Aristocrat / SRE / UC-72A / UC-72C
1941-built Waco SRE
The Waco E series is a small family of American-built cabin biplanes built between 1939 and 1942, which differed primarily by engine installation. The E series was the final development of the pre-war Waco line of biplane designs. A full four-seater, it had the best performance of any of the Wacos. First flown in 1939, it had a much slimmer and more streamlined fuselage than earlier Waco C and S models and heavily staggered unequal-span parallel-chord wings with rounded tips. Wings were plywood-skinned, and also had wire cross-bracing between the wings in place of the solid struts used on previous models.
Engines varied in power from 285 to 450 hp (213 to 336 kW), giving the E series a high cruising speed for the period of up to 195 mph (314 km/h). Production ceased in 1942.
The E series was sold to wealthier private pilot owners who required the comfort of a fully enclosed cabin and a high cruising speed, combined with a longer range. Because of the type's good performance, 15 examples were impressed by the United States Army Air Forces during World War II for communications work as the UC-72. Several of the USAAF examples were returned to civilian use after the end of the war and five E series aircraft remained airworthy in 2001.
Waco SRE impressed as USAAF UC-72
Note: the Waco GXE of 1929/30 was an unrelated biplane design with non-staggered wings
ARE Aristocrat / UC-72A
Engine: Jacobs L-6 MB, 330 hp (246 kW)
Propeller: Hamilton C/S
Length overall: 27 ft. 10 in.
Height: 8 ft. 8 in.
Wingspan, upper: 34 ft. 9 in.
Wingspan, lower: 24 ft. 4 in.
Airfoil: Clark Y
Chord upper: 72 in.
Chord lower: 48 in.
Weight gross: 4051 lbs.
Weight empty: 2563 lbs.
Fuel capacity: 125 USgal.
Oil capacity: 6 ¼ USgal.
Normal fuel consumption: 17 ½ gph
Top speed: 185 mph
Cruising speed: 155 mph
Landing speed: 58 mph
Rate of climb SL: 1170 ft.
Service ceiling: 18,000 ft.
5-place cabin land or sea biplane
Gear tread: 101 in.
one impressed by USAAF as UC-72A
Price with standard equipment 1939: $14,900.00
HRE Aristocrat / UC-72C
Engine: Lycoming R-680-E3, 300 hp (224 kW)
two impressed by USAAF as UC-72C
SRE Aristocrat / UC-72
Engine: 1 × Pratt & Whitney R-985 SB-2, 400 hp (300 kW)
Length: 27 ft 10 in (8.48 m)
Wingspan: 34 ft 9 in (10.59 m)
Height: 8 ft 8 in (2.64 m)
Empty weight: 2,734 lb (1,240 kg)
Max takeoff weight: 4,200 lb (1,905 kg)
Maximum speed: 202 mph (325 km/h; 176 kn)
Cruise speed: 195 mph (169 kn; 314 km/h)
Stall speed: 57 mph (50 kn; 92 km/h)
Range: 1,070 mi (930 nmi; 1,722 km)
Service ceiling: 23,500 ft (7,163 m)
Rate of climb: 1,550 ft/min (7.9 m/s)
Crew: 1 pilot
Capacity: 3 passengers
13 impressed by USAAF as UC-72
Unit cost: $18,000
Engine: Wright R-975 450 hp (336 kW)
offered to potential customers, but none built