Editing Anchor (section)

=== Danforth anchor ===
[[File:Fluke anchor-1-.gif|thumb|right|The Danforth is a light, versatile, highly popular fluke-style anchor.]]
American Richard Danforth invented the Danforth Anchor in the 1940s for use aboard [[landing craft]]. It uses a stock at the crown to which two large flat triangular flukes are attached. The stock is hinged so the flukes can orient toward the bottom (and on some designs may be adjusted for an optimal angle depending on the bottom type). Tripping palms at the crown act to tip the flukes into the seabed. The design is a burying variety, and once well set can develop high resistance. Its lightweight and compact flat design make it easy to retrieve and relatively easy to store; some anchor rollers and hawsepipes can accommodate a fluke-style anchor.

A Danforth does not usually penetrate or hold in gravel or weeds. In boulders and coral it may hold by acting as a hook. If there is much current, or if the vessel is moving while dropping the anchor, it may "kite" or "skate" over the bottom due to the large fluke area acting as a sail or wing.<ref>{{cite book|author1=Jim Howard|author2=Charles J. Doane|title=Handbook of Offshore Cruising: The Dream and Reality of Modern Ocean Cruising|url=https://books.google.com/books?id=NB4uFQuUlnEC&pg=PA312|year=2000|publisher=Sheridan House, Inc.|isbn=978-1-57409-093-2|page=312}}</ref>

The FOB HP anchor designed in [[Brittany]] in the 1970s is a Danforth variant designed to give increased holding through its use of rounded flukes setting at a 30° angle.<ref>{{cite web|url=https://patents.google.com/patent/EP0990584A1/en|title=Patent EP0990584A1 – Marine anchor of the flat type|work=google.de}}</ref>

The Fortress is an American aluminum alloy Danforth variant that can be disassembled for storage and it features an adjustable 32° and 45° shank/fluke angle to improve holding capability in common sea bottoms such as hard sand and soft mud.<ref>Hallerberg, Don, {{US Patent|5,154,133}} 13 October 1992</ref> This anchor performed well in a 1989 US [[Naval Sea Systems Command]] (NAVSEA) test<ref>Witherell, P.W.: ANCHOR TEST REPORT for NINE MOVABLE-FLUKE ANCHORS (31 pounds to 200 pounds) NAVSEA Rpt. No. 835-6269039, June 1989</ref> and in an August 2014 holding power test that was conducted in the soft mud bottoms of the Chesapeake Bay.<ref>{{cite web|url=http://www.boatus.com/seaworthy/magazine/2014/october/the-fine-art-of-anchoring.asp|title=The Fine Art of Anchoring|work=boatus.com}}</ref>