| SUM-N-2 Grebe | |
|---|---|
 XSUM-N-2 test missile on launcher with folded wings | |
| Type | Anti-ship missile |
| Place of origin | United States |
| Service history | |
| In service | 1950 |
| Used by | United States Navy |
| Production history | |
| Designer | National Bureau of Standards |
| Designed | 1947–1950 |
| Manufacturer | Goodyear Aircraft Company |
| No. built | 20 |
| Specifications | |
| Mass | Rocket powered, 2,500 lb (1,100 kg) Pulsejet powered, 3,000 pounds (1,400 kg) |
| Length | 16 ft 5 in (5.00 m) |
| Diameter | 21 in (530 mm) |
| Wingspan | 14 feet (4.3 m) |
| Warhead | Mark 41 torpedo |
| Engine | Solid-propellant rocket booster McDonnell pulsejet sustainer optional |
Operational range | Rocket powered, 5,000 yd (2.8 mi; 4.6 km) Pulsejet powered, 40,000 yd (23 mi; 37 km) |
| Maximum speed | Mach 0.5 |
The SUM-N-2 Grebe, also known as Kingfisher E and SUM-2, was a rocket- and pulsejet-powered anti-ship and anti-submarine missile developed by the United States Navy in the late 1940s. Intended to allow a ship to deliver a torpedo at a significant distance from the launch location, it proved impractical in trials, and did not enter operational service.