| "Old Faithful" | |
|---|---|
 4.5-Inch BBR with Mk 9 motor | |
| Type | Surface-to-surface rocket |
| Place of origin | United States |
| Service history | |
| Used by | United States Navy |
| Production history | |
| Designer | Caltech |
| Designed | 1942 |
| Produced | 1942–1945 |
| Specifications | |
| Mass | 29 lb (13 kg) |
| Length | 30 in (760 mm) |
| Diameter | 4.5 in (110 mm) |
| Warhead | High explosive |
| Warhead weight | 6.5 lb (2.9 kg) |
| Engine | Solid-fuel rocket |
Operational range | 1,100 yd (1.0 km) |
| Maximum speed | 242 mph (389 km/h) |
Guidance system | None |
The 4.5-Inch Beach Barrage Rocket, also known as "Old Faithful",[1] was a 4.5-inch (110 mm) rocket developed and used by the United States Navy during World War II. Originally developed from the "Mousetrap" anti-submarine rocket, it saw widespread use during the war, being replaced by more powerful rockets toward the end of the conflict.
- ^ Ordway and Wakeford 1960, p.77.