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Nameless Bob · 07-23-09, 12:02 AM

Thought I would put this link up.More info about construction/performance.

http://en.wikipedia.org/wiki/Project_Habakkuk

good info here too

http://www.uhaul.com/supergraphics/e...9&sort_order=3

The short version

Project Habakkuk (actually misspelled as Habbakuk — see below) was a plan by the British in World War II to construct an aircraft carrier out of ice, for use against German U-boats in the mid-Atlantic, which was out of range of land-based planes.

The Habakkuk, as proposed to Winston Churchill by Lord Mountbatten and Geoffrey Pyke in December 1942, was to be approximately 2,000 feet long and 300 feet wide, with a deck-to-keel depth of 200 feet, and walls 50 feet thick.[1] It was to have a draft of 150 feet, and a displacement of 2,000,000 tons or more, to be constructed in Canada from 280,000 blocks of ice.[2] (For comparison, an Essex-class carrier displaced 35,000 tons.) The building material was later changed to a mixture of ice and wood pulp known as Pykrete after Pyke, who proposed the Habakkuk project — the material was invented by others. The ship's deep draft would have kept it out of most harbours. Inside the vessel a refrigeration plant would maintain the structure against melting. The ship would have extremely limited manoeuvrability, but was expected to be capable of up to 10 knots (18 km/h) using 26 electric drive motors mounted in separate external nacelles (normal, internal ship engines would have generated too much heat for an ice craft). Its armaments would have included 40 dual-barrelled 4.5" DP (dual-purpose) turrets and numerous light anti-aircraft guns, and it would have housed an airstrip and up to 150 twin-engined bombers or fighters.

The Habakkuk was imagined to be virtually unsinkable as it would have effectively been a streamlined iceberg or floating island kept afloat by the buoyancy of its construction materials, and to be highly resilient to damage by virtue of its sheer bulk.

At the Quebec Conference of 1943 Lord Mountbatten brought a block of Pykrete along to demonstrate its potential to the bevy of admirals and generals who had come along with Winston Churchill and Franklin D. Roosevelt. Mountbatten entered the project meeting with two blocks and placed them on the ground. One was a normal ice block and the other was Pykrete. He then drew his service pistol and shot at the first block. It shattered and splintered. Next, he fired at the Pykrete to give an idea of the resistance of that kind of ice to projectiles. The bullet ricochetted off the block, grazing the trouser leg of Admiral Ernest King and ending up in the wall. The Admiral was impressed by Mountbatten's unorthodox demonstration.

It was projected to take $70 million and 8,000 people working for eight months to construct it,[citation needed] an expenditure which the British were unwilling to make at the time on such an experimental craft. Experiments on ice and pykrete as construction materials were carried out at Lake Louise, Alberta, and a small prototype was constructed at Patricia Lake, Alberta, measuring only 60 feet by 30 feet (18 by 9 m), weighing in at 1,000 tons and kept frozen by a 10 horsepower motor.[2] Work on the project continued through 1943, but major doubts as to feasibility had surfaced by October, and abandonment was recommended in January 1944, by when the Atlantic Gap had already been closed by long-ranged land-based aircraft. The use of ice had actually been falling out of favour before that, with other ideas for "floating islands" being considered, such as welding Liberty Ships or Landing craft together (Project TENTACLE).[3] The ice Habakkuk itself was never begun.

07-23-09, 12:02 AM	#5
Nameless Bob Watch Join Date: Jul 2008 Posts: 22 Downloads: 34 Uploads: 0	more info Thought I would put this link up.More info about construction/performance. http://en.wikipedia.org/wiki/Project_Habakkuk good info here too http://www.uhaul.com/supergraphics/e...9&sort_order=3 The short version Project Habakkuk (actually misspelled as Habbakuk — see below) was a plan by the British in World War II to construct an aircraft carrier out of ice, for use against German U-boats in the mid-Atlantic, which was out of range of land-based planes. The Habakkuk, as proposed to Winston Churchill by Lord Mountbatten and Geoffrey Pyke in December 1942, was to be approximately 2,000 feet long and 300 feet wide, with a deck-to-keel depth of 200 feet, and walls 50 feet thick.[1] It was to have a draft of 150 feet, and a displacement of 2,000,000 tons or more, to be constructed in Canada from 280,000 blocks of ice.[2] (For comparison, an Essex-class carrier displaced 35,000 tons.) The building material was later changed to a mixture of ice and wood pulp known as Pykrete after Pyke, who proposed the Habakkuk project — the material was invented by others. The ship's deep draft would have kept it out of most harbours. Inside the vessel a refrigeration plant would maintain the structure against melting. The ship would have extremely limited manoeuvrability, but was expected to be capable of up to 10 knots (18 km/h) using 26 electric drive motors mounted in separate external nacelles (normal, internal ship engines would have generated too much heat for an ice craft). Its armaments would have included 40 dual-barrelled 4.5" DP (dual-purpose) turrets and numerous light anti-aircraft guns, and it would have housed an airstrip and up to 150 twin-engined bombers or fighters. The Habakkuk was imagined to be virtually unsinkable as it would have effectively been a streamlined iceberg or floating island kept afloat by the buoyancy of its construction materials, and to be highly resilient to damage by virtue of its sheer bulk. At the Quebec Conference of 1943 Lord Mountbatten brought a block of Pykrete along to demonstrate its potential to the bevy of admirals and generals who had come along with Winston Churchill and Franklin D. Roosevelt. Mountbatten entered the project meeting with two blocks and placed them on the ground. One was a normal ice block and the other was Pykrete. He then drew his service pistol and shot at the first block. It shattered and splintered. Next, he fired at the Pykrete to give an idea of the resistance of that kind of ice to projectiles. The bullet ricochetted off the block, grazing the trouser leg of Admiral Ernest King and ending up in the wall. The Admiral was impressed by Mountbatten's unorthodox demonstration. It was projected to take $70 million and 8,000 people working for eight months to construct it,[citation needed] an expenditure which the British were unwilling to make at the time on such an experimental craft. Experiments on ice and pykrete as construction materials were carried out at Lake Louise, Alberta, and a small prototype was constructed at Patricia Lake, Alberta, measuring only 60 feet by 30 feet (18 by 9 m), weighing in at 1,000 tons and kept frozen by a 10 horsepower motor.[2] Work on the project continued through 1943, but major doubts as to feasibility had surfaced by October, and abandonment was recommended in January 1944, by when the Atlantic Gap had already been closed by long-ranged land-based aircraft. The use of ice had actually been falling out of favour before that, with other ideas for "floating islands" being considered, such as welding Liberty Ships or Landing craft together (Project TENTACLE).[3] The ice Habakkuk itself was never begun. Last edited by Nameless Bob; 07-25-09 at 04:16 AM.