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Aviation / Aerospace

Sikorsky S-43 (Baby Clipper)


Flying Boat / Amphibious Transport Aircraft [ 1935 ]



Sikorsky introduced their S-43 flying boat during the pre-war 1930s and built some 53 of the type for service locally and overseas.



Authored By: Staff Writer | Last Edited: 06/15/2016 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

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Prior to becoming a world-renown helicopter-maker, Sikorsky delivered to the United States military and civilian markets many fixed-wing aircraft types. One product of the pre-World War 2 years was the "S-43" flying boat / amphibious boat which arrived during the middle part of the 1930s. Fifty-three examples were competed with most of the stock taken on by Pan American World Airways to service passenger routes between the United States, the Caribbean and Central America. During its time in service, the aircraft came to be known as the "Baby Clipper".

The aircraft, on the whole, relied on proven flying boat qualities such as a high-wing mainplane, boat-like hull and deep fuselage. The high-wing arrangement mounted the twin air-cooled radial piston engines well-above the waterline to protect them from the salty sea spray. The boat-like hull was necessary for water landings and take-offs to which outboard pontoons ensured that the aircraft did not tip over in seas. The S-43 also became a true "amphibian" in that a wheeled, retractable undercarriage was also part of its base design which allowed for operation from traditional airstrips. Beyond its standard operating crew of two, the passenger cabin accommodated up to 25 in relative comfort. A conventional tail unit was featured showcasing a single vertical fin and low-set horizontal planes. However, the "S-43B" variant introduced a twin-fin appearance.

Beyond its service in and around Latin America, S-43 aircraft were featured as an inter-island flyer over Hawaii and was one of the aircraft types present at the Japanese attack on Pearl Harbor in December of 1941. Some operated over Alaska and portions of South America while American aviation pioneer Howard Hughes thought enough of the type to purchase one for his collection. At least five examples were taken on by the U.S. Army in 1937 as the "OA-8" and the U.S. Navy operated some seventeen of the type from 1937 onward under the designation of "JRS-1" (a pair from this stock was also in use by the USMC for a time).

S-43s were in active use up until the latter part of the 1940s by which time most were given up for better alternatives or lost to accident and not reclaimed.

As completed, the S-43 design was powered by 2 x Pratt & Whitney R-1690-52 series radial piston engines of 750 horsepower each. Maximum speed was 190 miles per hour with a range out to 775 miles. Its service ceiling reached 20,700 feet. An S-43 carrying 1,100lb in cargo set an altitude record for a flying boat / amphibian on April 14th, 1936, reaching 27,950 feet over Stamford, Connecticut.©MilitaryFactory.com
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Specifications



Sikorsky Aircraft - USA
Manufacturer(s)
Brazil; Chile; China; United States
Operators National flag of Brazil National flag of Chile National flag of China National flag of the United States
1935
Service Year
United States
National Origin
2
Crew
53
Units


SPECIAL-MISSION: SEARCH & RESCUE
Ability to locate and extract personnel from areas of potential harm or peril (i.e. downed airmen in the sea).
MARITIME / NAVY
Land-based or shipborne capability for operating over-water in various maritime-related roles while supported by allied naval surface elements.
TRANSPORT
General transport functionality to move supplies/cargo or personnel (including wounded and VIP) over range.
COMMERCIAL AVIATION
Used in roles serving the commercial aviation market, ferrying both passengers and goods over range.
INTELLIGENCE-SURVEILLANCE-RECONNAISSANCE
Surveil ground targets / target areas to assess environmental threat levels, enemy strength, or enemy movement.


51.2 ft
(15.60 meters)
Length
86.0 ft
(26.21 meters)
Width/Span
17.7 ft
(5.38 meters)
Height
12,754 lb
(5,785 kilograms)
Empty Weight
19,092 lb
(8,660 kilograms)
Maximum Take-Off Weight
+6,338 lb
(+2,875 kg)
Weight Difference


2 x Pratt & Whitney R-1690-52 air-cooled radial piston engines developing 750 horsepower each.
Propulsion
190 mph
(306 kph | 165 knots)
Max Speed
20,702 ft
(6,310 m | 4 miles)
Ceiling
775 miles
(1,247 km | 673 nm)
Range


MACH Regime (Sonic)
Sub
Trans
Super
Hyper
HiHyper
ReEntry
RANGES (MPH) Subsonic: <614mph | Transonic: 614-921 | Supersonic: 921-3836 | Hypersonic: 3836-7673 | Hi-Hypersonic: 7673-19180 | Reentry: >19030


Typically none.


S-43 - Sikorsky Company Model; initial production model.
S-43B - Twin-Tailed Design
OA-8 - US Army Air Corps Designation; five aircraft acquired.
JRS-1 - US Navy / USMC Designation; 17 aircraft acquired; 2 examples serving with USMC.
"Baby Clipper" - Nickname


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