Sikorsky S-40 Flying Boat

The Sikorsky S-40 was an amphibious flying boat built in the early 1930s, and the largest commercial airliner of its time. Flying for Pan American Airways, a total of three aircraft were built, manufactured by the Vought-Sikorsky Aircraft Division of the United Aircraft Corporation in Stratford, Connecticut. All three were scrapped during World War II. The aircraft first flew on November 19, 1931 and was piloted by Charles Lindbergh from Miami, Florida to the Panama Canal Zone. The S-40 was the first of many aircraft known as Flying Clipper and Pan Am Clipper.

The S-40 was nicknamed the "Flying Forest" for its maze of support struts.

General characteristics
Crew: four
Capacity: 40 passengers
Length: 76 ft 8 in (23.37 m)
Wingspan: 114 ft 0 in (34.76 m)
Height: 23 ft 10 in (7.27 m)
Wing area: 1,875 ft² (174.3 m²)
Empty: 24,748 lb (11,249 kg)
Loaded: 34,000 lb (15,455 kg)
Maximum takeoff: lb ( kg)
Powerplant: 4x Pratt & Whitney R-1690 radial engines, 575 hp (429 kW) each

Performance
Maximum speed: 135 mph (217 km/h)
Range: 875 miles (1,408 km)
Service ceiling: 13,000 ft (3,963 m)
Rate of climb: ft/min ( m/min)
Wing loading: 18 lb/ft² (89 kg/m²)
Power/Mass: 0.07 hp/lb (0.11 kW/kg)

Flight test report:
To: MR. I. I. SIKORSKY

cc: Mr. Neilson
Capt.Sergievsky
Mr. S. Gluhareff
Mr. N. Sinitzin
Files (2)

Date: August 31, 1931

From: M. GLUHAREFF

Subject: FLIGHT REPORT ON S-40 AMPHIBION - GROSS WEIGHT 32,000#

Weather: clear, approximately 12 wind (N.W.)

Temperature: 75

Barometer pressure: 30.04

Time: start 2:15 P.M.; finish 4:13 P.M.

Take-off time on water - 30 seconds

Cruising on 1650 R.P.M. all engines - average speed 100.5 M.P.H.

Cruising on 1750 R.P.M. all engines - average speed 107.75 M.P.H.

High speed, full throttle, 2010 R.P.M. all engines - average speed 130.25 M.P.H.

Cross wind interfered with the speed test flight; it was exactly 90 degrees to the course.
The fairing on the landing gear axles came off, building a screeen about 1-1/2 sq. feet
flat plate area on each side.

Landing at New Haven Harbor about 3:20 P.M. the fairings from the axles were removed entirely.

Climb to Altitude Time Speed Ind. R.P.M.
500 30 sec. 90 1850
1000 1 min. 17 sec. 95 1800
2000 3 min. 7 sec. 95 1820
3000 4 min. 40 sec. 96 1820
4000 6 min. 25 sec. 95 1800
5000 8 min. 10 sec. 97 1800
5800-6000 10 min.

At 6000 ft. altitude - three engines - flight was tested - rate of climb approximately
200 ft. per min. (R.P.M. - 1830)

At 2000 ft. altitude - two engines - flight was tested - during five (5) minutes 600 ft
was lost - (R.P.M. - 1820)

At 2000 ft. altutude - three engines - flight was repeated - during 1 minute exactly,
the ship gained 200 ft. (from 2100 to 2300 ft.) (R.P.M. - 1820).

Pilot: Captain Sergievsky
Observers: S.Gluhareff
M.Gluhareff

Signed
M. GLUHAREFF

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