Sikorsky S-35

S-35
Role	Transatlantic sesquiplane
National origin	United States
Manufacturer	Sikorsky Manufacturing Company
First flight	August 23, 1926
Number built	1

The Sikorsky S-35 was an American twin-engined sesquiplane transport later modified to use three-engines. It was designed and built by the Sikorsky Manufacturing Company for an attempt by Rene Fonck on a non-stop Atlantic crossing for the Orteig Prize. It was destroyed in the attempt.

Design and development[]

The S-35 was designed as a twin-engined transport with a 1,000-mile (1,600-kilometre) range.^[1] During 1926 Rene Fonck, a French First World War fighter ace, was looking for a multi-engine aircraft to enter a competition to be the first to fly non-stop from New York to Paris. Raymond Orteig offered a prize of $25,000.^[1] Fonck had Sikorsky redesign the aircraft with three engines.^[1]

The S-35 was a sesquiplane with a fixed tail-skid landing gear. It was modified to take three 425 hp (317 kW) Gnome-Rhône Jupiter 9A radial engines and fitted with jettisonable auxiliary landing gear.^[2] These modifications took time to complete and the aircraft first flew on 23 August 1926 from Roosevelt Field.^[1] Sikorsky started a series of test flights but as none were at the maximum takeoff weight of 24,200 pounds (11,000 kg), Sikorsky wanted to delay the transatlantic crossing until early 1927, but the promoters of the flight would not accept a delay and the aircraft was prepared for the crossing.^[1]

Operational history[]

The first transatlantic attempt was scheduled for the September 16 but was abandoned after the aircraft developed a fuel leak.^[1] The next available break in the weather was to be the 21 September and the aircraft was fueled during the previous night from 50 barrels of gasoline. When the aircraft was weighed it was found to be 4,000 pounds (1,800 kg) overweight.^[1] Rene Fonck insisted on carrying a sofa and refrigerator on the journey. Fonck and his co-pilot Lt Lawrence Curtin^[3] of the U.S. Navy were joined by a radio operator and a Sikorsky mechanic for the flight.^[1] In front of a large crowd at Roosevelt Field the aircraft gathered speed, the auxiliary landing gear broke away, the aircraft failed to get airborne and plunged down a steep slope at the end of the runway and burst into flames.^[1]^[4] The two pilots escaped injury but the radio operator Charles Clavier^[5] and mechanic Jacob Islamoff^[6] were killed. The aircraft which had cost $80,000 was not insured.^[1]

Specifications[]

Sikorsky S-35 3-view drawing from Les Ailes, June 24, 1926

Data from Best^[1]

General characteristics

Crew: four
Length: 44 ft 0 in (13.41 m)
Upper wingspan: 101 ft 0 in (30.78 m)
Lower wingspan: 76 ft 0 in (23.16 m)
Height: 16 ft 0 in (4.88 m)
Wing area: 794 sq ft (73.8 m²) upper wing
Empty weight: 9,700 lb (4,400 kg)
Gross weight: 20,000 lb (9,072 kg)
Max takeoff weight: 24,200 lb (11,000 kg)
Powerplant: 3 × Gnome-Rhône Jupiter 9A radial engine, 425 hp (317 kW) each
Propellers: 2-bladed, 10 ft 6 in (3.20 m) diameter

Performance

Maximum speed: 145 mph (233 km/h, 126 kn)
Endurance: 7 hours
Service ceiling: 16,800 ft (5,100 m)

References[]

^ Jump up to: ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Best, Martin (2002). "Sikorsky American Fixed-Wing Aircraft, Part 1: Sikorsky S-29-A to S-35". Air-Britain Archive. 2002 (4): 127. ISSN 0262-4923.
^ "Sikorsky S-35". aviastar.org. February 2007. Retrieved 6 August 2016.
^ Lawrence W. Curtin; findagrave.com Retrieved August 29, 2017
^ Joshua Stoff. Long Island aircraft crashes 1909-1959. p. 48.
^ Charles Clavier; findagrave Retrieved August 25, 2017
^ Jacob Islamoff; findagrave Retrieved August 25, 2017

Bibliography[]

Laureau, Patrick (February 2000). "La première tentative de traversée de l'Atlantique (1926): L'écheque du Sikorsky S-35" [The First Tentative Attempts to Cross the Atlantique: The Failure of the Sikorsky S-35]. Avions: Toute l'aéronautique et son histoire (in French) (83): 38–43. ISSN 1243-8650.

External links[]

The S-35 in practice flights
INSUFFICIENT HEADWAY: The Trail, September 1926 chapter 43 appearing in New York Daily News Sunday March 26, 2000

[archive-1] Jump up to: ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k Best, Martin (2002). "Sikorsky American Fixed-Wing Aircraft, Part 1: Sikorsky S-29-A to S-35". Air-Britain Archive. 2002 (4): 127. ISSN 0262-4923.

[avi-2] "Sikorsky S-35". aviastar.org. February 2007. Retrieved 6 August 2016.

[3] Lawrence W. Curtin; findagrave.com Retrieved August 29, 2017

[4] Joshua Stoff. Long Island aircraft crashes 1909-1959. p. 48.

[5] Charles Clavier; findagrave Retrieved August 25, 2017

[6] Jacob Islamoff; findagrave Retrieved August 25, 2017

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show v t Sikorsky aircraft
Fixed-wing aircraft (company designations)	S-1 S-2 S-3 S-4 S-5 S-6 S-7 S-8 S-9 S-10 S-11 S-12 S-13 S-14 S-15 S-16 S-17 S-18 S-19 S-20 S-21 S-22 S-23 S-24 S-25 S-26 S-27 S-28 S-29-A S-30 S-31 S-32 S-33 S-34 S-35 S-36 S-37 S-38 S-39 S-40 S-41 S-42 S-43 VS-44 S-45
Fixed-wing aircraft (military designations)	C-6 C-28 JRS JR2S PS RS XBLR-3 XPBS XSS XV-2
Helicopters (company designations)	VS-300 (S-46) S-47 S-48 S-49 S-50 S-51 S-52 S-53 S-54 S-55 S-56 S-57 S-58 S-59 S-60 S-61 S-61L/N S-61R S-62 S-63 S-64 S-65 S-66 S-67 S-68 S-69 S-70 S-71 S-72 S-73 S-74 S-75 S-76 S-80 S-92 S-97 S-100 S-300 S-333 S-434
Helicopters (military designations)	SH-3 HH-3E/F R-4 H-5 H-6 H-18 H-19 H-34 CH-37 XH-39 HH-52A CH-53 CH-53E CH-53K MH-53 CH-54 UH-60 HH-60G HH-60J/MH-60T MH-60R/S SH-60B/F H-60J/K VH-60 RAH-66 VH-92 CH-124 CH-148 HLH
Experimental aircraft	Cypher/Cypher II Firefly Raider Raider X SB-1 X2 XBLR-3 XV-2