Waco E series

https://en.wikipedia.org/wiki/Waco_E_series

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 prewar 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. Note: the Waco GXE of 1929/30 was an unrelated biplane design
with non-staggered wings.

Role
Four-seat cabin biplane

National origin
United States

Manufacturer
Waco Aircraft Company

First flight
1939

Introduction
1940

Status
some still flying in 2011

Primary user
private owner pilots

Produced
1939–1942

Number built
30

Unit cost

$18,000 (SRE)


Developed from
Waco C series

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.

Variants

ARE Aristocrat 300 hp (224 kW) Jacobs L-6 (4 built, one impressed as UC-72A)

HRE Aristocrat 285 hp (213 kW) Lycoming R-680 (5 built, 2 impressed as UC-72C)

SRE Aristocrat 400 hp (298 kW) Pratt & Whitney R-985 Wasp Junior SB-2 (21 built,
12 impressed as UC-72)

WRE Aristocrat 420 hp (313 kW) Wright R-975 - model offered to potential
customers, but none built
Impressed aircraft

Main article: Waco UC-72

UC-72
12 impressed Waco SRE for USAAF

UC-72A
One impressed Waco ARE

UC-72C
Two impressed Waco HRE

Specifications (SRE)

General characteristics
Crew: 1 pilot
Capacity: 3 passengers
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)
Powerplant: 1 × Pratt & Whitney R-985 SB-2 nine-cylinder radial air-cooled
piston, 400 hp (300 kW)

Performance
Maximum speed: 202 mph (325 km/h; 176 kn)
Cruise speed: 195 mph (314 km/h; 169 kn)
Stall speed: 57 mph (92 km/h; 50 kn)
Range: 1,070 mi (930 nmi; 1,722 km)
Service ceiling: 23,500 ft (7,200 m)
Rate of climb: 1,550 ft/min (7.9 m/s)






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