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The vessels each displace 1,920 long tons (1,950 t) while measuring about 95 m (311 ft 8 in) in length and 12 m (39 ft 4 in) in width. [ 1 ] [ 2 ] The OPV will use the UNIted COmbined Radio aNtenna (UNICORN) NORA-50 integration mast, which has a bar-shaped dome that houses the antennas for tactical data link, Tactical Air Navigation System ...
The 37 ft (11 m) mast, 13.50-foot (4.11 m) boom and 8-foot (2.44 m) spinnaker pole can be built of wood, but most boatbuilders and owners now choose ready-made aluminum spars from a source that meets ITCA specifications, for low maintenance and high performance.
Guyed masts are frequently used for radio masts and towers. The mast can either support radio antennas (for VHF, UHF and other microwave bands) mounted at its top, or the entire structure itself can function as a mast radiator antenna (for VLF, LF, MF). In the latter case, the mast needs to be insulated from the ground. Guyed radio masts are ...
Many mast-aft rigs utilize a small mainsail and multiple staysails that can resemble some cutter rigs. A cutter is a single masted vessel, differentiated from a sloop either by the number of staysails, with a sloop having one and a cutter more than one, or by the position of the mast, with a cutter's mast being located between 50% and 70% of the way from the aft to the front of the sailplan ...
The antenna must be very large at the VLF frequencies used; the supporting masts are 250–300 metres (820–980 ft) high, and the topload is about 1,900 metres (6,200 ft) in diameter. The trideco antenna was developed for high power naval transmitters, which transmit on frequencies between 15 and 30 kHz at powers up to 2 megawatts, to ...
A yawl setting a genoa, main, and mizzen The lines plan of a Royal Navy 26 ft (7.9 m) yawl, dated 1799. The transom stern differentiates this type from the double-ended, clinker-built working craft. A yawl is a type of boat. The term has several meanings.
A typical skipjack is 40 to 50 feet in length. The boats use direct link Edson worm steering gear mounted immediately forward of the transom. The dredge windlass and its motor are mounted amidships, between the mast and deckhouse. Rollers and bumpers are mounted on either side of the boat to guide the dredge line and protect the hull.
The Marlow-Hunter 50 Center Cockpit is a recreational keelboat, built predominantly of fiberglass.It has a B&R rig fractional sloop rig, a raked stem, a center cockpit, a walk-through reverse transom with a swimming platform and folding ladder, an internally mounted spade-type rudder controlled by a wheel and a fixed fin keel or wing keel.
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