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Curtiss CS

CS / SC
Curtiss CS with naval aviators 1924.jpg
Role Reconnaissance and torpedo bomber aircraft
Manufacturer Curtiss Aeroplane Company, Martin
First flight 1923
Primary user United States Navy
Number built 83

The Curtiss CS (or Model 31) was a reconnaissance and torpedo bomber aircraft used by the United States Navy during the 1920s. It was a large single-engine biplane with single-bay unstaggered wings, the design conventional in all respects other than the fact that the lower wing was of greater span than the upper. The CS was built to allow its undercarriage to be quickly and easily interchangeable between wheeled, tailskid undercarriage, and twin pontoons for operation from water. Provision for the carriage of a torpedo was semi-recessed into the underside of the fuselage, blended in behind an aerodynamic fairing. The pilot and gunner sat in tandem open cockpits, while accommodation inside the fuselage was provided for a third crewmember who served as bombardier and radio operator. This station was also provided with a dorsal hatch aft of the gunner's position, and a ventral blister aft of the torpedo recess, which was used for aiming bombs or torpedoes.

Curtiss produced six CS-1 prototypes for the Navy in 1923, which were mostly used for engine tests. Two examples of the improved CS-2 were built the following year and set a number of world speed, distance, and endurance records for seaplanes in its class. The Navy ordered both the CS-1 and CS-2 into production, but when Curtiss tendered with a price of $32,000 per aircraft, Martin undercut them with a tender of $25,200 for each CS-1 and $19,863 for each CS-2 and won the contract. Curtiss refused to provide full sets of drawings and data to Martin, so Martin-built machines were in part reverse-engineered from a Curtiss-built CS-1 provided by the Navy. By the time the Martin-produced aircraft were delivered in 1925–26, the Navy's designation system had changed, and they entered service as the SC-1 and SC-2. Martin-built SC-2s suffered from poor handling characteristics and soon earned the nickname "Sea Cow". Meanwhile, the Naval Aircraft Factory made extensive modifications to the two Curtiss CS-2s leading them to be redesignated CS-3. Further development of the design was carried out by Martin as the T3M and T4M, and eventually by Great Lakes as the TG.

In 1924, the CS-2 was used to break numerous world records for seaplanes in its class in three long-range flights. The first of these took place overnight between 22 and 23 June, when Lt Frank Wead and Lt John D. Price set five records - distance (963.123 mi, 1,544.753 km), duration (13 hours, 23 minutes, 15 seconds), speed over 500 km (73.41 mph, 117.74 km/h), speed over 1,000 km (74.27 mph, 119.12 km/h) and speed over 1,500 km (74.17 mph/118.96 km/h). Between 11 and 12 July, the same pilots would break the distance and duration records again (994.19 mi/1,594.58 km over 14 hours, 53 minutes, 44 seconds). On October 10, these same two records would be exceeded by Lt Andrew Crinkley and Lt Rossmore Lyon in a flight of 1,460 mi (2,342 km) in 20 hours, 28 minutes. While these would have been new world records, the flight was not officially timed, and was therefore not recognized as such.


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