Stinson Reliant

Reliant

Role	Liaison and training monoplane
National origin	United States
Manufacturer	Stinson Aircraft Company
First flight	1933
Primary user	United States Army Air Corps
Number built	1327

The Stinson Reliant was a popular single-engine four to five seat high-wing monoplane manufactured by the Stinson Aircraft Division of the Aviation Manufacturing Corporation of Wayne, Michigan.

1 Design and development
2 Operational history
3 Variants
- 3.1 Civilian variants
- 3.2 Military variants
4 Operators
- 4.1 Military operators
- 4.2 Civil operators
5 Specifications (SR-10F)
6 See also
7 References
8 External links

Design and development

The Reliant is a three-place high-wing fixed tailwheel land monoplane powered with a variety of radial engines. ^[1]

1,327 Reliants of all types were made from 1933 to 1941, in different models, from SR-1 to SR-10. The final commercial model, the Stinson Reliant SR-10, was introduced in 1938. A militarized version was first flown in February 1942 and remained in production through several additional versions (all externally identical) until late 1943 for the US and British armed forces.

Reliant production can be broken into two distinct types - the straight wing Reliants (all models up to SR-6) and the gull wing Reliants (all models from SR-7 and after including the militarized V-77/AT-19) with there being little in common between the two groups of types. The straight wing Reliant had a wing of constant chord and thickness which was supported by two struts each side with additional bracing struts. In contrast the taper wing Reliant had the broadest chord and thickness of the wing at mid span, with the outer wing trailing edge heavily angled forward and a rounded cutout on the leading edge root, all supported by a single strut. The taper wing had a significant step up between the fuselage and the wing, and the changes in wing thickness gave it a distinct gull appearance from the front.

Operational history

The Reliant was used by the U.S. Army in World War II as a utility aircraft, designated UC-81, and as trainer designated AT-19. They were also used by the Royal Navy and Royal Air Force for light transport and communication duties. After the war they were sold on the civilian market as the Vultee V-77.

The V-77 was a spartan version of the SR-10 with the 300hp Lycoming R680-E3B, a single door on the left side and the traditional "Bump" cowl was replaced with a simpler smooth cowl. Internal structure was beefed up significantly over the commercial models and a distinctive triangle shaped counterbalance was added to the rudder.

Variants

The SR-10 Reliant was available as a landplane, seaplane and skidplane in the following configurations:^[2]

Ambulance (2 Stretchers)
Cargo/Ambulance
Target Towing
Firefighting
Photographic

Civilian variants

SR Reliant: Powered by a 215-hp (160-kW) Lycoming R-680 radial piston engine.
SR-1: Powered by a Lycoming R-680-2 radial piston engine.
SR-2: Powered by a 240-hp (179-kW) Lycoming R-680-7 radial piston engine.
SR-3: Similar to the SR-1, but with minor structural changes.
SR-4: Powered by a 250-hp (186-kW) Wright R-760-E radial piston engine.
SR-5: Improved version, powered by a 225-hp (168-kW) Lycoming R-680-4 radial piston engine.
SR-5A: Powered by a 245-hp (183-kW) Lycoming R-680-6 radial piston engine.
SR-5B: Powered by a 240-hp (179-kW) Lycoming R-680-2 radial piston engine.
SR-5C: Powered by a 260-hp (194-kW) Lycoming R-680-5 radial piston engine.
SR-5E: Powered by a 225-hp (168-kW) Lycoming R-680-4 radial piston engine.
SR-5F: Powered by a 250-hp (186-kW) Wright R-760-E radial piston engine.
SR-6: Five-seat cabin aircraft, powered by a Lycoming R-680-6 radial piston engine.
SR-6A: Four-seat cabin aircraft, powered by a 225-hp (168-kW) Lycoming R-680-4 radial piston engine.
SR-6B: Four-seat cabin aircraft, powered by a Lycoming R-680-5 radial piston engine.
SR-7: First gull wing series.
SR-7B: Five-seat cabin aircraft, powered by a Lycoming R-680-B6 radial piston engine. 47 built.^[3]
SR-7C: Five-seat cabin aircraft, powered by a Lycoming R-680-B5 radial piston engine. Three built.^[3]
SR-8A: Four-seat cabin aircraft.
SR-8B: Four-seat cabin aircraft, powered by a Lycoming R-680-B6 radial piston engine.
SR-8C: Four-seat cabin aircraft, powered by a Lycoming R-680-B5 radial piston engine.
SR-8D: Four-seat cabin aircraft, powered by a Wright R-760-E2 radial piston engine.
SR-8DM: Utility transport version of the SR-8D.
SR-8E: Five-seat cabin aircraft, powered by a 320-hp (239-kW) Wright R-760-E23 radial piston engine.
SR-8DE: Utility transport version of the SR-8E.
SR-9
SR-9A
SR-9B: Powered by a Lycoming R-680-B2 radial piston engine.
SR-9C: Powered by a Lycoming R-680-D5 radial piston engine.
SR-9D: Powered by a Wright R-760-E1 radial piston engine.
SR-9E: Powered by a Wright R-760-E2 radial piston engine.
SR-9F: Powered by a Pratt & Whitney R-985 radial piston engine.
SR-10
SR-10B: Powered by a Lycoming R-680-D6. One built.^[4]
SR-10C: Powered by a Lycoming R-680-D5 engine. 46 built.^[4]
SR-10D: Wright R-760E-1 engine. 3 built.^[5]
SR-10E: Powered by a Wright R-760E-2 radial piston engine. 21 built.^[5]
SR-10F: Powered by a Pratt & Whitney R-985 Wasp Junior SB radial piston engine. 18 built.^[6]
SR-10G: Powered by a Lycoming R-680-E1 radial piston engine. 12 built.^[4]
SR-10J: Lycoming R-680-E3 engine. 11 built.^[4]
SR-10K: Wright R-760E-3. Two built.^[4]

Military variants

AT-19: USAAF designation for a training variant of the UC-81 for the Royal Navy under Lend-Lease as the Reliant I, 500 built.^[7]
AT-19A: Original designation of the L-9A which was a Voyager not a Reliant.^[7]
AT-19B: Original designation of the L-9B which was a Voyager not a Reliant.^[7]
AT-19C: Conversions of AT-19s for photo-survey aircraft for the USAAF, 51 conversions.^[7]
UC-81: Four impressed SR.8Bs.^[8]
UC-81A: Two impressed SR.10Gs.^[8]
UC-81B: One impressed SR.8E.^[8]
UC-81C: Three impressed SR.9Cs.^[8]
XC-81D: One civil SR.10F operated by the military for the development of glider pick-up techniques.^[8]
UC-81E: Four impressed SR.9Fs.^[8]
UC-81F: Seven impressed SR.10Fs.^[8]
UC-81G: Three impressed SR.9Ds.^[8]
UC-81H: One impressed SR.10E.^[8]
UC-81J: Nine impressed SR.9Es.^[8]
UC-81K: Five impressed SR.10Cs.^[8]
UC-81L: Two impressed SR.8Cs.^[8]
UC-81M: One impressed SR.9EM.^[8]
UC-81N: Two impressed SR.9Bs.^[8]
L-12: Two SR.5As impressed into service with the USAAF during World War II.^[9]
L-12A: Two SR.7Bs impressed into service during World War II.^[9]
RQ-1: One SR-5 Reliant was acquired by the US Coast Guard in 1935.
XR3Q-1: One SR-5 Reliant was acquired by the US Navy in 1935.
Reliant I: 500 Reliants were supplied to the Royal Navy under Lend-Lease. The Reliants were used for light transport and communications, navigation and radio training duties.

Operators

Military operators

Argentina

Argentine Navy^[6]

Australia

Royal Australian Air Force - 1

Philippines

Philippine Army Air Corps

United Kingdom

United States

Civil operators

Brazil

El Salvador

Grupo TACA

Mexico

Aerovías de México

Norway

Widerøe

Paraguay

Líneas Aéreas de Transporte Nacional (LATN)

United States

Northwest Airways

Specifications (SR-10F)

Data from General Dynamics Aircraft and their Predecessors^[6]

General characteristics

Crew: one, pilot
Capacity: 3 to 4 passengers
Length: 27 ft 11 in (8.51 m)
Wingspan: 41 ft 7 in (12.68 m)
Height: 8 ft 6 in (2.59 m)
Wing area: 256.5 sq ft (23.84 m²)
Empty weight: 3,045 lb (1,384 kg)
Loaded weight: 4,605 lb (2,093 kg)
Powerplant: 1 × Pratt & Whitney Wasp Junior SB nine-cylinder air-cooled radial engine, 400 hp (298 kW)

Performance

Cruise speed: 154 knots (177 mph, 285 km/h)
Range: 739 nmi (850 mi, 1,369 km)
Service ceiling: 21,000 ft (6,400 m)
Rate of climb: 1,330 ft/min (6.8 m/s)

References

^ Pilot's Flight Operating Instructions for Army Model AT-19 Airplanes and British Model Reliant - 15 June 1944
^ Stinson SR-10 Specifications - April 1940
^ ^a ^b Wegg 1990, p. 135.
^ ^a ^b ^c ^d ^e Wegg 1990, p. 136.
^ ^a ^b Wegg 1990, pp. 136–137.
^ ^a ^b ^c Wegg 1990, p. 137.
^ ^a ^b ^c ^d Andrade 1979, p.79
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ Andrade 1979, p.81
^ ^a ^b Andrade 1979, p.130
^ Halley 1980, p. 306.

Andrade, John (1979). U.S.Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN 0-904597-22-9.
Halley, James J (1980). The Squadrons of the Royal Air Force. Tonbridge, Kent, UK: Air Britain (Historians). ISBN 0 85130 83 9.
Wegg, John (1990). General Dynamics Aircraft and their Predecessors. London: Putnam. ISBN 0-85177-833-X.

External links

Aircraft produced by Stinson Aircraft Corporation

Civil designations	SB-1 · SM-1 · SM-2 · SM-6 · SM-6000 · Model A · Model O · Model R · Model S · Model SR · Model U · Model W · Model 10 · Model 74 · Model 105 · Model 108

Military designation	AT-19 · C-81 · C-91 · CQ-2 · L-1 · L-5 · L-9 · L-12 · L-13 · O-49 · O-54 · O-62 · U-19

Names	Airliner · Detroiter · Reliant · Sentinel · Vigilant · Voyager

Aircraft produced by Vultee

Manufacturer designations	V-1 · V-11 · V-12 · V-20 · V-32 · V-33 · V-35 · V-37 · V-38 · V-39 · V-40 · V-41 · V-42 · V-43 · V-44 · V-45 · V-46 · V-47 · V-48 · V-49 · V-50 · V-51 · V-52 · V-54 · V-55 · V-56 · V-57 · V-58 · V-61 · V-69 · V-70 · V-72 · V-74 · V-75 · V-76 · V-77 · V-78 · V-80 · V-83 · V-84 · V-85 · V-86 · V-88 · V-90 Model numbering continued by Convair

By role	Fighters: XP-54 · P-66 Attack aircraft: A-19 · A-31 · A-35 · XA-41 Trainers: BT-13 · BT-15

Designation sequences for this aircraft:

USAAF/USAF liaison aircraft

L-1 • L-2 • L-3 • L-4 • L-5 • L-6 • L-7 • L-8 • L-9 • L-10 • L-11 • L-12 • L-13 • L-14 • L-15 • L-16 • L-17 • L-18 • L-19 • L-20 • L-21 • L-22 • L-23 • L-24 • L-25 • L-26 • L-27 • L-28

USAAC/USAAF/USAF/Tri-service trainer aircraft

Advanced Trainer	AT-1 · AT-2 · AT-3 · AT-4 · AT-5 · AT-6 · AT-7 · AT-8 · AT-9 · AT-10 · AT-11 · AT-12 · XAT-13 · XAT-14 · XAT-15 · AT-16 · AT-17 · AT-18 · AT-19 · AT-20 · AT-21 · AT-22 · AT-23 · AT-24

Basic Combat	BC-1 · BC-2 · BC-3

Basic Trainer	BT-1 · BT-2 · YBT-3 · XBT-4 · YBT-5 · BT-6 · Y1BT-7 · BT-8 · BT-9 · Y1BT-10 · BT-11 · BT-12 · BT-13 · BT-14 · BT-15 · XBT-16 · XBT-17

Primary Trainer (1924-1948)	PT-1 · XPT-2 · PT-3 · PT-4 · XPT-5 · YPT-6 · YPT-7 · XPT-8 · YPT-9 · YPT-10 · PT-11 · PT-12 · PT-13 · PT-14 · YPT-15 · PT-16 · PT-17 · PT-18 · PT-19 · PT-20 · PT-21 · PT-22 · PT-23 · PT-24 · YPT-25 · PT-26 · PT-27

Trainer (1948-1990)	T-28 · T-29 · XT-30 · XT-31 · XT-32 · T-33 · T-34 · T-35 · XT-36 · T-37 · T-38 · T-39 · T-40 · T-41 · T-42 · T-43 · T-44 · T-45 · T-46 · T-47 · YT-48 · T-48 · CT-49 · T-50 · T-51 · T-52 · T-53

"T-1", "T-2", "T-3" and "T-6" have also been assigned since 1962 in a separate sequence.

USAAS/USAAC/USAAF/USAF transport designations 1925–1962, 2005-2006

Main sequence 1925-1962	C-1 • C-2 • C-3 • C-4 • C-5 • C-6 • C-7 • C-8 • C-9 • XC-10 • Y1C-11 • Y1C-12 • C-13 (Not assigned) • C-14 • C-15 • C-16 • Y1C-17 • C-18 • C-19 • C-20 • C-21 • Y1C-22 • Y1C-23 • Y1C-24 • Y1C-25 • C-26 • C-27 • C-28 • C-29 • YC-30 • C-31 • C-32 • C-33 • C-34 • XC-35 • C-36 • C-37 • C-38 • C-39 • C-40 • C-41/A • C-42 • UC-43 • C-44 • C-45 • C-46 • C-47 • C-48 • C-49 • C-50 • C-51 • C-52 • C-53 • C-54 • C-55 • C-56 • C-57 • C-58 • C-59 • C-60 • UC-61 • C-62 • C-63 • C-64 • C-65 • C-66 • UC-67 • C-68 • C-69 • UC-70/A/B/C/D • UC-71 • UC-72 • C-73 • C-74 • C-75 • C-76 • UC-77 • C-78 • C-79 • C-80 • UC-81 • C-82 • C-83 • C-84 • UC-85 • C-86 • C-87 • C-88 • C-89 • C-90 • C-91 • UC-92 • C-93 • UC-94 • UC-95 • UC-96 • KC-/C-97 • C-98 • XC-99 • UC-100 • UC-101 • C-102 • UC-103 • C-104 • C-105 • C-106 • C-107 • C-108 • C-109 • C-110 • C-111 • XC-112 • XC-113 • XC-114 • XC-115 • XC-116 • C-117 • C-118 • C-119 • XC-120 • C-121/F • YC-122 • C-123/A • C-124 • YC-125 • LC-126 • C-127 (I) • C-127 (II) • C-128 • YC-129 • C-130 • C-131 • C-132 • C-133 • YC-134 • KC-/C-135 • C-136 • C-137 • C-138 (Not assigned) • C-139 (Not assigned) • C-140 • C-141 • XC-142

Revived sequence 2005-2006	C-143 • C-144

See also: Post-1962 list

US Navy/US Marine Corps transport designations 1931-1962

Atlantic Aircraft	RA

Buhl	RB

Curtiss	RC • R4C • R5C

Douglas	RD • R2D • R3D • R4D • R5D • R6D

Bellanca	RE

Kinner	RK • R2K

Martin	RM

Lockheed	RO • R2O • R3O • R4O • R5O • R6O • R7O/R7O-2

Stinson	RQ • R3Q

Fairchild	RQ • R2Q • R4Q

Ford	RR

Sikorsky	RS

Northrop	RT

Lockheed	R6V • R7V/R7V-2 • R8V

Convair	RY • R2Y • R3Y • R4Y

USN/USMC transport (single-engined) designations 1939-1941

Beechcraft	GB

Howard	GH

Fairchild	GK

Stinson	GQ

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