Spencer Air Car

The Spencer Amphibian Air Car is an American light amphibious aircraft. The name was first used in 1940 for a prototype air vehicle that developed into the Republic Seabee. The name was later used by its designer Percival Spencer for a series of homebuilt amphibious aircraft roughly based on the Seabee design.[4]

S-12-D Air Car
Spencer Air Car at Mill Valley Seaplane base near San Francisco in April 1989 with engine cowling open
Role single-engine amphibian
National origin United States
Manufacturer Spencer-Larsen Aircraft Corporation, Spencer (homebuilt)
Designer Percival H. "Spence" Spencer
First flight 8 August 1941,[1] May 1970 (homebuilt)[2]
Introduction 1941, 1968 (homebuilt)
Status in operation
Primary user private owner pilots
Number built 1 prototype, over 50 homebuilt completions[3]
Developed from SL-12C amphibian, Republic Seabee

Design and development

Percival H. Spencer formed the Spencer-Larsen Aircraft Corporation and designed the SL-12C amphibian. Disenfranchised with corporate policies in the development of the SL-12C amphibian, Spencer started the Spencer Amphibian Air Car in 1940. The original Spencer Amphibian Air Car was test flown in 1941. The aircraft was put into storage due to restrictions in place in America during World War II. The aircraft and rights to its design were sold to Republic as the "Seabee" in 1943.[5] After leaving Republic, he designed the on-off two-seat Air Car. In 1968, Spencer and retired USAF Col. Dale L. "Andy" Anderson formed a new company to market a four-place amphibious homebuilt design once again called the Spencer Amphibian Air Car, with S-12C, S-12D, S-12E, and S-14 variants. The first example was test flown in 1970 in Chino, California. The unit had a build cost of $8700.00

The S-12-D Aircar is an improved and larger four-seat aircraft, which retains the basic layout of the Seabee. The two seat S-14 used advanced composites and was test flown by Spencer in 1983 at the age of 86. Its design did not meet expectations and the sole example was donated to the Experimental Aircraft Association Museum in Oshkosh, Wisconsin.

The Air Car is built from wood, steel and glass-fibre. It has a strut-braced high wing and the cabin and fuel-carrying floats are similar to the Seabee, but the tail unit is more angular and a retractable tricycle undercarriage is fitted.

In addition to examples constructed by Spencer, plans of the design have been sold for home construction and the first amateur-built Air Car flew in September 1974. Over 50 had flown by 2001.[3] Examples are currently (2009) flying in the US and Canada.

Variants
Spencer Amphibian Air Car
initial two-seat version
S-12-C
early production with 110 hp (82 kW) Lycoming
S-12-D
main production version with 180 hp (134 kW) Lycoming O-360 or 260 hp (194 kW) Lycoming O-540
Spencer Air Car S-12-E
S-12-E
prototype re-engined with 285 hp (213 kW) Continental Tiara 6-285
S-14 Air Car Junior
two-seater, twin booms, Lycoming O-320, one example
Spencer-Larsen SL-12C
Later prototype built in association with the (Victor A) Larsen Aircraft Co, incorporating many design changes, but flight test were unsuccessful and the sole prototype was dismantled after 10 hours flying.[6]

Specifications S-12-E

Data from Jane's All the World's Aircraft 1975-76,[7] Airlife's World Aircraft[3]

General characteristics

  • Crew: 1
  • Capacity: 3 passengers / 1,050 lb (476 kg) payload
  • Length: 26 ft 5 in (8.05 m)
  • Wingspan: 37 ft 4 in (11.38 m)
  • Height: 12 ft 0 in (3.66 m) including propeller
  • Wing area: 184 sq ft (17.1 m2)
  • Airfoil: NACA 4415[8]
  • Empty weight: 2,190 lb (993 kg)
  • Max takeoff weight: 3,200 lb (1,451 kg)
  • Fuel capacity: 94 US gal (78 imp gal; 356 l) fuel in fuselage tank and stabilising floats ; 2.25 US gal (2 imp gal; 9 l) oil
  • Powerplant: 1 × Continental Tiara 6-285-B 6-cylinder air-cooled horizontally-opposed piston engine
  • Propellers: 3-bladed Hartzell, 7 ft 0 in (2.13 m) diameter metal constant-speed reversible pusher propeller

Performance

  • Maximum speed: 128 kn (147 mph, 237 km/h) at sea level at MTOW
  • Cruise speed: 122 kn (140 mph, 226 km/h) at 5,500 ft (1,676 m) at MTOW
117 kn (135 mph; 217 km/h) at 7,600 ft (2,316 m) 65% power at MTOW
  • Stall speed: 46 kn (53 mph, 85 km/h) flaps up
37.5 kn (43 mph; 69 km/h) with 35° flap
  • Range: 695 nmi (800 mi, 1,287 km) 65% power at 7,800 ft (2,377 m) with 30 minutes reserve
  • Rate of climb: 1,000 ft/min (5.1 m/s) at sea level
  • Wing loading: 17.4 lb/sq ft (85 kg/m2)
  • Power/mass: 0.0877 hp/lb (0.1442 kW/kg)
  • Take-off time: 16 seconds from calm water at sea level

References
  1. Johnson, E. R., "Everyman's Amphibian," Aviation History, November 2012, p. 15.
  2. Johnson, E. R. "Everyman's Amphibian," Aviation History, November 2012, p. 15.
  3. Simpson, Rod (2001). Airlife's World Aircraft. Airlife Publishing Ltd. p. 518. ISBN 1-84037-115-3.
  4. Air Trails: 82. Summer 1971. Missing or empty |title= (help)
  5. http://www.seabee.info/spencer.htm
  6. "American airplanes: sk - ss". Aerofiles.com. 2009-03-16. Retrieved 2011-04-06.
  7. Taylor, John W.R., ed. (1975). Jane's All the World's Aircraft 1975-76 (66th annual ed.). New York: Franklin Watts Inc. pp. 463–464. ISBN 978-0531032503.
  8. Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.


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