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The Drydock - Episode 397 (Patreon)

Published:
2026-04-11 08:00:11
Imported:
2026-04

Content

00:00:00 - Intro

00:00:36 - I am interested in how underwater broadside/fixed launch torpedo tubes work

00:05:53 - What do you think led to such a high loss rate within the Grampus class?

00:08:19 - Would the Axis have benefited from a fleet submarine analogous to the UK’s Thames/River class with its high surface and submerged speed?

00:12:59 - How many lives could Carpathia have saved if it was closer to Titanic?

00:22:45 - How effective were conventional bombs against submarines?

00:26:00 - Did the RN go all in on turbines after HMS Dreadnought?

00:29:13 - Why did nobody else use the French forced circulation engine designs? Such efficiency seems like something everyone would have wanted.

00:31:12 - What are the main difference between fuel oil for boilers and fuel oil for diesels?

00:34:35 - How did the Imperial German's Navy use of VTE over turbines impact their surface fleet during the First World War?

00:38:01 - Given that multiple ships would have different efficiencies with Turbines, how did a fleet, or convoy determine their cruising and battle speeds?

00:41:45 - In the Naval Melee of Guadalcanal, what other options did Admiral Callaghan have to realistically battle and win?

00:44:39 - Enterprise’s last after action report mentions that the Hellcat was becoming inadequate in dealing with Kamikazes and that her VF(N) Squadron would need Corsairs until such time a new Night Fighters are available. What Night Fighters was this report talking about?

00:47:11 - Why does the cruiser Varyag have a memorial?

00:49:52 - If you were given a battlegroup comprising Atago (your flagship), Littorio, Victorious, and 8 Bagleys. Where in WW2 can you do the most good?

00:54:03 - Iowa speed limits?

00:56:24 - What if the British just keep building ships?

Files

The Drydock - Episode 397

00:00:00 - Intro 00:00:36 - I am interested in how underwater broadside/fixed launch torpedo tubes work 00:05:53 - What do you think led to such a high loss rate within the Grampus class? 00:08:19 - Would the Axis have benefited from a fleet submarine analogous to the UK’s Thames/River class with its high surface and submerged speed? 00:12:59 - How many lives could Carpathia have saved if it was closer to Titanic? 00:22:45 - How effective were conventional bombs against submarines? 00:26:00 - Did the RN go all in on turbines after HMS Dreadnought? 00:29:13 - Why did nobody else use the French forced circulation engine designs? Such efficiency seems like something everyone would have wanted. 00:31:12 - What are the main difference between fuel oil for boilers and fuel oil for diesels? 00:34:35 - How did the Imperial German's Navy use of VTE over turbines impact their surface fleet during the First World War? 00:38:01 - Given that multiple ships would have different efficiencies with Turbines, how did a fleet, or convoy determine their cruising and battle speeds? 00:41:45 - In the Naval Melee of Guadalcanal, what other options did Admiral Callaghan have to realistically battle and win? 00:44:39 - Enterprise’s last after action report mentions that the Hellcat was becoming inadequate in dealing with Kamikazes and that her VF(N) Squadron would need Corsairs until such time a new Night Fighters are available. What Night Fighters was this report talking about? 00:47:11 - Why does the cruiser Varyag have a memorial? 00:49:52 - If you were given a battlegroup comprising Atago (your flagship), Littorio, Victorious, and 8 Bagleys. Where in WW2 can you do the most good? 00:54:03 - Iowa speed limits? 00:56:24 - What if the British just keep building ships?

Comments

W. Osterberg

Thank you Drach for another awesome video!

Sir Lawrence Vanderdecken

If I recall something I hurd I'm not entirely sure if this is correct but the closer you get to the bottom the more drag happens between the bottom of the hull and the water between it and the ocean floor. Take it with a grain of salt.

Steven Palmer

As the vessel displaces water due to movement resistance increases. The vessel squats similar in nature to bank cushion and stern suction in a river or narrow waterway. I sailed on containerships where squat could be up to a meter. On some ships we had speed restrictions in certain depths of water.

Peter Navarch

Photos of submarines. I note the very tidy casings, including of recessing of the folded bow planes. This illustrates the pursuit of high surface speed n the design mix. The Int Code flag A shows the boat at the time was undergoing speed trials.

Peter Navarch

Fuel for steamships. Around 20 years ago, when the RAN still had steamships; Type 12s and Adams. we abandoned furnace fuel oil and burned diesel (no tank heating required!) under the boilers. This appeared to me when I was providing support for replenishment tanker HMAS WESTRALIA (ex RFA APPLELEAF) after her fatal fire. She had 4" diesel and 12" diesel amongst her cargo pipe lines. The latter was resolved as "former FFO" lines.

Peter Navarch

I believe that interference between ship and bottom/banks first received attention as "blockage" between mid section of ship model and the tank walls and bottom in ship model towing tanks, around 1960, when I was a Naval Architecture student. Bank attraction did result in generating some ship groundings at this time.

Peter Navarch

Turbines/VTE. In WW 2 the Liberty ships elected to go VTE as these were direct coupled, and thus made no call on the limited USA capability of building large gearcases. The electric drive for the turbine T2 tankers was regarded as bulky and heavy, despite being expedient at the time

Peter Navarch

Mobilisation of Reserve Ships. If there is a substantial activation of reserve ships in a time of national emergency, where will the core of trained/skilled people, to lead and train the "walk in" raw persons come from? I served in the RNR, around 1960. for around 8 years, as AB and later SBLT, after my graduation. We had trained in seamanship and minesweeping on a weekly basis of evenings, numerous weekends, and 2 weeks annual continuous training. I then had a dormant appointment as a watchkeeping officer to an unspecified vessel in the fleet of 100 + laid up TON class minesweepers.

Peter Navarch

Underwater Torpedo Tubes. These did not last long. They were soon replaced by the multiple, trainable (i believe) deck launchers, common on destroyers, up to the DARINGs, as I recollect. Were these the "last" of the surface ship heavyweight torpedoes in RN/Cwth ships? As a designer, I expect many designers were pleased to see the departure of submerged launch torpedoes from surface ships. Underdeck torpedoes axially across a ship - not attractive. Bow tubes, and stowage of reloads, in submarines, oriented to ship's longitudinal axis, made a lot more sense. Aiming, and guiding by preset gyros to the latest firing solution, does not appear attractive. A lot of weight, complexity and space demands in a relatively small hull. Reloads for underdeck tubes would have been major issues. Reloads were rare enough for the traditional destroyer deck torpedo launcher.

OWKTREE

General question on whether any site or publication has broad information data on ships in the 1900-1950 period in a consistent format. Such as length, beam, draft measurements plus at least some basic data on their propulsion system, armament, etc.