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Aviation / Aerospace

Curtiss F9C Sparrowhawk

Biplane Parasite Fighter Aircraft [ 1931 ]

The Curtiss F9C Sparrowhawk biplane was built to serve as a parasite fighter launched fro USN airships USS Akron and USS Macon.

Authored By: Staff Writer | Last Edited: 10/08/2020 | Content ©www.MilitaryFactory.com | The following text is exclusive to this site.

Image copyright www.MilitaryFactory.com; No Reproduction Permitted.

GO TO SPECIFICATIONS [+]

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In between the great World Wars of the 20th Century, aviation advanced at a considerable pace. The canvas-and-wood biplanes of old began to evolve to include metal skinning, spatted undercarriages and more streamlining than ever before. This allowed far-off thinking to be had amongst warplanners and aviation engineers alike and, in tim,e the idea of a "parasite fighter" took hold within the ranks of the United States Navy (USN).

The parasite fighter concept involved a compact, single-seat fighter attached to mothership (an airship or fixed-wing bomber or similar) where the fighter could be launched and retrieved from. This pairing of weapon systems benefited the mothership in several ways - extending its range (particularly in reconnaissance sorties), self-defense or defending contested airspace. More advanced work on the parasite fighter topic was had during the post-World War 2 period and this involved jet-powered fighters and bombers but the concept was never fully accepted in any one form operationally.

Curtiss' F9C "Sparrowhawk" fighter was originally born under a USN requirement for a shipboard fighter and competed against designs from Berliner-Joyce and General Aviation. This requirement sheltered a secretive program for the USN which involved creation of a parasite fighter to field from its fleet of airships - namely USS Akron and USS Macon.

The USN fighter was eventually embodied in the "XF9C-1" prototype and a single example of this aircraft was realized. A second prototype, XF9C-2, was later completed, and this carried a single-strut main undercarriage. Serial production forms eventually totaled six F9C-2 "Sparrowhawk" fightersand used a similar tripod undercarriage as seen in the original prototype. XF9C-2 was eventually taken into the active inventory of the USN and reworked into a production F9C-2 standard fighter.

A first-flight was had on February 12th, 1931.©MilitaryFactory.com

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Design-wise the Curtiss aircraft was a traditionally-arrange biplane fighter. There was an upper and lower wing mainplane joined by extensive cabling and N-style struts. Over the midway span of the upper wing was a structure containing the retrieval hook, or "Skyhook", to work in conjunction with the retractable "trapeze" structure to be found under the belly of the airships themselves. The engine was fitted to a forward compartment in the usual way, driving a two-bladed propeller unit, and the fuselage was well-streamlined. The tail unit showcased a single fin and low-mounted horizontal planes as well as a tailwheel. The undercarriage was spatted at the main legs for aerodynamic efficiency and each was also wheeled. The pilot's position was set aft of the upper wing assembly he operated in an open-air cockpit.

The fighter was powered by a single Wright R-975-E3 air-cooled radial piston engine of 438 horsepower and armed through 2 x 0.30 caliber Browning air-cooled machine guns firing through the spinning propeller blades by way of synchronizing gear. The aircraft weighed 960 kilograms empty and 1,260 kilograms gross. It could manage a top speed of 176 miles per hour.

In practice the Sparrowhawk fighters were lowered from their hangar aboard the airship along their already-connected retractable trapeze assemblies. The pilot would then engage his engine and detach after having assessed conditions. The Sparrowhawk could then be used to reconnoiter the terrain far off from the mothership or engage enemy fighters one-to-one. Once the mission was completed, the pilot would return his aircraft to the mothership and, using the hook above the upper wing assembly, reconnect to the airship's trapeze system. The trapeze assembly was then retracted into the airship and Sparrowhawk returned to its hangar. Several Sparrowhawks could be held aboard a single airship.

The fighter series operated from the two aforementioned American airships from the period of 1932 until 1935 and were used in reconnaissance sorties over both American coastlines. However, the program was doomed by the loss of USS Akron in 1933 along the New Jersey coastline and USS Macon in 1935 off the coast of California. Some four Sparrowhawks went down with the Macon when it crashed on February 12th, 1935. A single Sparrowhawk example survived history and is on display at the Steven F. Udvar-Hazy Center near Washington, D.C. and represents an example to have served at one time with USS Macon.©MilitaryFactory.com

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Specifications

Service Year

1931

Origin

United States

Status

RETIRED
Not in Service.

Crew

1

Production

7
UNITS

Curtiss Aeroplane and Motor Company - USA

(View other Aviaton-Related Manufacturers)

United States

(OPERATORS list includes past, present, and future operators when applicable)

✓ Air-to-Air Combat, Fighter
General ability to actively engage other aircraft of similar form and function, typically through guns, missiles, and/or aerial rockets.

✓ Intelligence-Surveillance-Reconnaissance (ISR), Scout
Surveil ground targets / target areas to assess environmental threat levels, enemy strength, or enemy movement.

Length

20.6 ft
(6.27 m)

Width/Span

83.7 ft
(25.50 m)

Height

35.8 ft
(10.92 m)

Empty Wgt

2,116 lb
(960 kg)

MTOW

2,778 lb
(1,260 kg)

Wgt Diff

+661 lb
(+300 kg)

(Showcased structural values pertain to the base Curtiss F9C Sparrowhawk production variant)

Installed: 1 x Wright R-975-E3 radial piston engine developing 415 horsepower and driving a two-bladed propeller in the nose.

Max Speed

176 mph
(283 kph | 153 kts)

Ceiling

19,193 ft
(5,850 m | 4 mi)

Range

295 mi
(475 km | 880 nm)

Rate-of-Climb

1,700 ft/min
(518 m/min)

♦ MACH Regime (Sonic)

Sub

Trans

Super

Hyper

HiHyper

ReEntry

♦

(Showcased performance specifications pertain to the base Curtiss F9C Sparrowhawk production variant. Performance specifications showcased above are subject to environmental factors as well as aircraft configuration. Estimates are made when Real Data not available. Compare this aircraft entry against any other in our database or View aircraft by powerplant type)

2 x 0.30 caliber (7.62mm) Browning machine guns synchronized to fire through the spinning propeller blades.

Supported Types

Graphical image of an aircraft medium machine gun

(Not all ordnance types may be represented in the showcase above)

Hardpoint Mountings: 0

XF9C-1 - Initial Prototype Model; tripod strut undercarriage; scrapped during 1936.

XF9C-2 - Secondary Prototype Model; single-strut undercarriage; later reworked to F9C-2 production standard for active service.

F9C-2 - Production Model Designation; six examples completed to the XF9C-1 design; four lost with USS Macon crash.

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