The US Navy Coupled Ocean-Wave Prediction System

Polysiloxane coatings are the most recent high performance coatings developed to take advantage of the heat and oxidation resistant properties of silicone-based materials. Commercially available polysiloxane coatings predominately consist of organic-inorganic siloxane materials (though some pure siloxane materials are available). Recently, the US Navy has approved polysiloxane coatings as “High Durability” in their specification for exterior weather resistant coatings (MIL-PRF-24635 Type V and VI). Navy approval comes after over 20 years of industry development of polysiloxane coatings for high performance industrial and marine applications, yet issues remain with their cost-effective implementation in the Navy fleet. This paper will review experiences of the offshore and marine industry with polysiloxane coatings and provide an update on the Navy adoption of the technology.

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A Duet for Sailors and Pansies: Queer Archival Work and Male Same-Sex Dancing in Follow the Fleet (1936) and Other Depression-Era Films

10.1093/oxfordhb/9780190877996.013.8 ◽

2021 ◽

pp. 186-213

Author(s):

David Lugowski

Keyword(s):

Essential Role ◽

Contextual Analysis ◽

Same Sex ◽

Hollywood Films ◽

Production Code ◽

The Us ◽

Us Navy ◽

Mass Entertainment ◽

Archival Work ◽

Depression Era

This chapter explores a queer all-male dance lesson for partnered sailors in the Fred Astaire–Ginger Rogers musical Follow the Fleet (1936), using archival research (scripts, Production Code Administration records) and comparative textual and contextual analysis. It raises the queerness of Rogers and Astaire before exploring two intersecting axes. The association of sailors with queer behavior and effeminate “pansies” occurs in military scandals, paintings, and Depression-era Hollywood films, including Sailor’s Luck and Son of a Sailor (both 1933). The queerness of male same-sex dancing arises in ballet and in film, including Suicide Fleet (1931). Various institutions criticized or attempted to censor such representations, but they also found acceptance. The US Navy, for example, wanted the comical dance lesson removed from Fleet; instead, it was only rewritten, suggesting the inability to remove queerness from culture and its essential role in mass entertainment.

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Tumblehome Ships - From Greek Triremes to the Zumwalt

10.5957/smc-2021-016 ◽

2021 ◽

Author(s):

Robert Forrest Roddy

Keyword(s):

World War I ◽

World War ◽

Steam Power ◽

Loss Of Life ◽

Damage Stability ◽

The Us ◽

Us Navy ◽

Major Loss

After almost a century the US Navy has reintroduced tumblehome into the design of naval combatants. This paper discusses some of the reasons tumblehome was originally designed into ships and why it served it owners well for many centuries. The transition from sail to steam power a little over a century ago led to a variety of problems with the combatant ships designed with tumblehome where the lack of damage stability caused a major loss of life as these ships sank so quickly. During World War I ships designed with tumblehome fell out of favor and some of the ships were actually modified to remove the tumblehome from the design. These changes in the design of tumblehome ships are discussed in this paper.

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Optimization of the Hybrid Ship Transport Factor through Retrofitted Wave Cancelling Side-Hull Expansions and Bow Bulb

10.5957/fast-2015-032 ◽

2015 ◽

Author(s):

Manivannan Kandasamy ◽

Ping C. Wu ◽

Scott Bartlett ◽

Loc Nguyen ◽

Frederick Stern

Keyword(s):

High Performance ◽

Negative Impact ◽

Fiscal Year ◽

Hull Form ◽

Transport Factor ◽

Resistance Reduction ◽

The Us ◽

Us Navy ◽

Speed Range ◽

Design Speed

The US Navy is currently considering the introduction of a Flight III variant beginning with DDG-123 in Fiscal Year 2016. The new design incorporates a new combat system and associated power and cooling upgrades. The overall system improvements increase the payload of the ship and the resulting increased displacement has a negative impact on the service life allowance for range, fuel consumption and sea-keeping characteristics. The present objective is to increase the hull displacement without resistance and sea-keeping penalty and with minimal modifications to the baseline DTMB-5415 design (open literature surrogate of the existing DDG-51 hull form) by using retrofitted blisters in the form of side hull expansions and a bow-bulb. The investigation makes use of high-performance CFD computing for analysis of wave cancellation mechanisms. A candidate modified 5415 design with both blisters and bow bulb shows a resistance reduction of ~11% w.r.t.the baseline 5415 in the design speed range of 15-19 knots, even though the displacement is increased by 8%, such that the transport factor is increased by 19%.

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