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Amphibious operations

Posted: Wed Feb 22, 2017 9:42 am
by Francis Marliere

I have some questions about amphibious operations (just the landing, not assault, which is even more complicated).

I assume that not all beaches are suited for a landing. What is the minimum size and maximum slope for the beaching of a small craft (LCVP, LCM, LCT) ? Same question for a LST.

I expect amphibious operations to be difficult in rough weather, despite historical counter exemples (Normandy). In which sea state it becomes dangerous or even impossible to sail in a small craft ? Same question for the deployment of small craft from a LSD / from a davies or deck of a ship. Same question for the beaching of a LST.

Since sea state may be a problem for amphibious operations, it may be better to land in a sheltered area. Not being a sailor, I don't realize how a bay or a creek can protect from heavy sea. Assuming a sea state of, let's say, 5 in open sea, what would it be in the sheltered area ?

I would like to estimate the time taken by a small craft to make a rotation. Transit time is easy to guess, but how long does it take to load and unload a LCVP / LCM / LCT ? How long does it take to unload a LST once beached ?

I assume that an unit that have been landed need space for defensive positions and stores. How much space does a batallon-sized unit need ?

Thanks for any help,

Francis Marliere

Re: Amphibious operations

Posted: Wed Feb 22, 2017 4:42 pm
by Literalman
I found a document that will probably interest you, though it doesn't have specific answers to the questions you asked. On the Hyperwar website at ... index.html you can read "Landing Operations Doctrine, United States Navy, 1938." It doesn't have numbers about the slope of a beach or the sea state, but it does have sections on beachheads and selection of landing areas.

Re: Amphibious operations

Posted: Sat Feb 25, 2017 5:30 pm
by dunmunro

Re: Amphibious operations

Posted: Tue Feb 28, 2017 10:34 am
by Francis Marliere