| Built By: | Armstrong Whitworth (Tyne) |
| Build Group: | H21 |
| Fate: | Scrapped in February 1945 at Troon. |
| 19-02-1919 | Launched |
| 15-04-1920 | Completed |
| 21-06-1940 | H44 torpedoed and sank the small Danish merchant Alfa off Texel, Netherlands. At 1750 hours H44 spotted a merchant ship of about 3000 tons at 4000 yards. At 1810 hours two torpedoes were fired from 3500 yards. One torpedo was seen to hit the target amidships three minutes after firing. Four of the crew of the Alfa died in the attack. |
| Length overall | 171 ft 9 inch |
| Beam | 15 ft 9 inch |
| Depth | 15 ft 4 inch |
| Displacement | 438 tons (surface) |
| 504 tons (submerged) | |
| Diving Depth | 150 ft |
| Speed | Surface 13 knots (design) |
| Surface 11.5 knots (service) | |
| Submerged 10 to 10.5 knots (design) | |
| Submerged 9 knots (service) | |
| No. of shafts | 2 |
| Armament | 4 x 21 inch bow tubes (6 torpedoes carried) |
| Endurance | Surface: 2000 miles at full power (design) |
| Surface: 1100 miles at full power or 1600 miles at 10 knots (service) | |
| Submerged: 70 miles at 3 knots (design) | |
| Submerged: 9 miles at 8 knots or 34 miles at 3.5 knots (service) | |
| Complement | 22 |
Platypus (I 56) 1916 - 1957 |
|
| Class: | Depot Ships |
| Built By: | |
| Build Group: | I 56 |
|
Fate: Platypus was placed into reserve on 13 May 1946, paid off on 1 November 1956 and was sold for scrap on 20 February 1958. |
|
This witty and perceptive account of the early years of submarine development contains much new material and the lives of the forgotten pioneers of submarines.
It includes many wonderful inventions and even more colourful inventors, but focuses primarily on John Philip Holland, the Irish-American genius who took submarine development out of the hands of lunatics and visionaries and turned it into a deadly weapon of war
12 pages added or updated in the last 1 month
Please help to maintain this site by reporting any Errors, Broken Links, Information or Site Issues on this page using this button
If you find this site useful, please consider supporting my work with a small Donation.
Please Note: Donations made using this option go directly to the site owner and not to the Submariners Association.
Thankyou for your support.
| Length overall | 171 ft 9 inch |
| Beam | 15 ft 9 inch |
| Depth | 15 ft 4 inch |
| Displacement | 438 tons (surface) |
| 504 tons (submerged) | |
| Diving Depth | 150 ft |
| Speed | Surface 13 knots (design) |
| Surface 11.5 knots (service) | |
| Submerged 10 to 10.5 knots (design) | |
| Submerged 9 knots (service) | |
| No. of shafts | 2 |
| Armament | 4 x 21 inch bow tubes (6 torpedoes carried) |
| Endurance | Surface: 2000 miles at full power (design) |
| Surface: 1100 miles at full power or 1600 miles at 10 knots (service) | |
| Submerged: 70 miles at 3 knots (design) | |
| Submerged: 9 miles at 8 knots or 34 miles at 3.5 knots (service) | |
| Complement | 22 |
Platypus (I 56) 1916 - 1957 |
|
| Class: | Depot Ships |
| Built By: | |
| Build Group: | I 56 |
|
Fate: Platypus was placed into reserve on 13 May 1946, paid off on 1 November 1956 and was sold for scrap on 20 February 1958. |
|
This witty and perceptive account of the early years of submarine development contains much new material and the lives of the forgotten pioneers of submarines.
It includes many wonderful inventions and even more colourful inventors, but focuses primarily on John Philip Holland, the Irish-American genius who took submarine development out of the hands of lunatics and visionaries and turned it into a deadly weapon of war
12 pages added or updated in the last 1 month
Please help to maintain this site by reporting any Errors, Broken Links, Information or Site Issues on this page using this button
If you find this site useful, please consider supporting my work with a small Donation.
Please Note: Donations made using this option go directly to the site owner and not to the Submariners Association.
Thankyou for your support.

This form is for you to comment on, or add additional information to this page. Any questions will be deleted. If you wish to ask a question contact the Branch or the Webmaster using the Contact Us page or ask your question on our Facebook Page