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For a small boat (e.g. 22' / 6.7 m sailing yacht), this might consist of a heavy weight on the seabed, a 12 mm or 14 mm rising chain attached to the "anchor", and a bridle made from 20 mm nylon rope, steel cable, or a 16 mm combination steel wire material. The heavy weight (anchor) should be a dense material.
At the front was a bow compartment containing a 91 pounds (41 kg) pound anchor and 150 feet (46 m) of rope for tie off the aircraft. Access was via a hatch on each side of the nose, while a smaller top hatch allowed a crewman to attach either a towing line, mooring line or anchor line to two removable vertical mooring posts. [ 6 ]
This is the form most commonly used for aircraft tie-down. One taut-line hitch is tied 15–30 cm from the aircraft and adjusted for tension, then a second taut-line hitch is tied 5–20 cm further from the aircraft and finished with a half-hitch.
Barrier nets catch the wings and fuselage of an aircraft and use an arresting engine or other methods such as anchor chains or bundles of woven textile material to slow the aircraft down. On some land-based airfields where the overrun area is short, a series of concrete blocks referred to as an engineered materials arrestor system (EMAS) is ...
The original Danforth is still manufactured and sold by Tie Down Engineering in the USA. Peter Bruce of the Isle of Man in the UK developed the claw-type "Bruce" anchor in the 1970s. Bruce Anchor Co has its primary role in the very large anchor business, producing mooring anchors and permanent installation types for heavy industry, such as oilrigs.
U.S. Navy Keystone PK-1 flying boat, BuNo A-8516, is forced down in heavy seas and sinks. [86] 19 October Sole Lockheed-Detroit YP-24, 32–320, crashes during tests at Wright Field, Ohio. During evaluation flight, landing gear extension system fails with gear only partly deployed when in-cockpit crank handle breaks off.