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hull girder stresses

Strength of ships — The strength of ships is a topic of key interest to Naval Architects and shipbuilders. Ships which are built too strong are heavy, slow, and cost extra money to build and operate since they weigh more, whilst ships which are built too weakly… … Wikipedia
Rail profile — Rail from 1896 Cross sections of flat bottomed which can rest directly … Wikipedia
R38 class airship — NOTOC Infobox Aircraft name= R38 class, or A class airship caption=The R38/ZR 2 making its first flight trial on 23 June 1921 type=Patrol airship national origin=United Kingdom manufacturer=Short Brothers designer= first flight=23 June 1921… … Wikipedia