Mast for a sail

Ships – Watercraft with means used in providing sailpower – Having specifically defined hull shape

Patent

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Details

114 90, B63H 904

Patent

active

045012148

ABSTRACT:
Mast (1) having essentially a rectangular cross-section with rounded narrow sides, preferably made in sandwich-type construction from integrally fiberglass-reinforced polyurethane structural foam (7) as core material with fiberglass laminates (8) as stressed skins bonded to both wide sides. The depth measured between the two narrow sides is greatest in the vicinity of the attachment area of the wishbone-type boom (12), and it decreases from there towards at least the top end, whereby the average depth of the mast cross-section shall measure at least twice as much as the mast width. The mast (1) for a sail-board is connected with the wishbone-type boom (12) via an articulated attachment (13) thus permitting the mast to pivot freely within the limits of the wishbone boom and to point its narrow leading edge against the wind. The mast (1) is essentially submitted only to a stress resulting from the tractional force of the sail (14) attached behind the narrow backside of the mast. The mast (1) possesses a much higher breaking strength and stiffness edgeways than conventional round tubular masts. Furthermore, the narrow flat mast (1) has a drastically reduced frontal area and is therefore aerodynamically much more efficient as well as lighter in weight than a conventional round mast.

REFERENCES:
patent: 601494 (1898-03-01), Clapham
patent: 2162441 (1939-06-01), Mead
patent: 2544081 (1951-03-01), Hallen
patent: 3310017 (1967-03-01), Dyer
patent: 3487800 (1970-01-01), Schweitzer et al.
patent: 3765360 (1973-10-01), Monfort
patent: 3882810 (1975-05-01), Roeser
patent: 3948199 (1976-04-01), Lamboley

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