Originally developed as a small anti-torpedo boat gun. During World War I this weapon was mounted on some landing craft and also used as a landing gun. Used during World War II on some small coastal defense boats and submarine chasers.
| Designation | 6 cm/21 (2.4") Casemate Gun C/98
6 cm/21 (2.4") S-Bts KL/21 6 cm/21 (2.4") Bts KL/21 |
|---|---|
| Ship Class Used On | Boat Gun |
| Date Of Design | 1898 |
| Date In Service | 1900 (?) |
| Gun Weight | N/A |
| Gun Length oa | 107 in (0.121 m) |
| Bore Length | 99 in (2.505 m) |
| Rifling Length | N/A |
| Grooves | N/A |
| Lands | N/A |
| Twist | N/A |
| Chamber Volume | N/A |
| Rate Of Fire | 12 - 14 rounds per minute |
| Type | Separate |
|---|---|
| Projectiles and Weight 1 | HE L/3,4: 6.0 lbs. (2.71 kg)
Shrapnel: 5.2 lbs. (2.38 kg) |
| Bursting Charge | HE L/3,4: 0.28 lbs. (0.128 kg) |
| Projectile Length | HE L/3,4: 8.0 in (203.2 cm)
Shrapnel: N/A |
| Propellant Charge | 0.25 lbs. (0.115 kg) W.P. 6/07 (4 x 4 x 1.25) |
| Cartridge | 0.96 lbs. (0.435 kg)
60 mm x 64 mm R |
| Muzzle Velocity | HE: 1,434 fps (437 mps)
Shrapnel: 1,470 fps (448 mps) |
| Working Pressure | N/A |
| Approximate Barrel Life | N/A |
| Ammunition stowage per gun | N/A |
- ^From the photographs below, it would appear that other ammunition types were introduced during World War I.
| Elevation | Distance |
|---|---|
| Range Maximum | 3,720 yards (3,400 m) |
| Designation | Single mounts |
|---|---|
| Weight | N/A |
| Elevation | N/A |
| Elevation Rate | Hand operated, only |
| Train | N/A |
| Train Rate | Hand operated, only |
| Gun recoil | N/A |
"Naval Weapons of World War Two" by John Campbell
"Munitionslexikon Band2" by Karl R. Pawlas
"Waffenlehre" by Richard Berlin Wille
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"Diagrams of Great War - German Naval Guns; Shells & Explosives; Fuses & Exploders" by The Royal Laboratory Woolwich 1921-22
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Special help from H. Zertner, Peter Lienau and 1st Sergeant China Ludovic (Belgian Demining Service)
28 May 2008 Benchmark
19 May 2012 - Updated to latest template
22 April 2016 - Added photographs of gun from early 1900s
08 February 2024 - Converted to HTML 5 format and added shell photographs and sketches