Snorkel mast for a semi-submersible vehicle
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United States of America Patent
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-
Sep 16, 1986
Grant Date -
N/A
app pub date -
Dec 14, 1984
filing date -
Dec 14, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
There is described a snorkel mast for a submersible vehicle. The mast terminates at the upper end in an inverted U-shaped snorkel head pipe section closed by a butterfly valve. The butterfly valve is operated by a bell-crank lever having a float at one end and a water impact flap at the other. Operation of the bell-crank lever by water level action against the float or by water impact action on the flap if a wave washes over the top of the snorkel mast acts to close the butterfly valve. The mast carries a fairing which comprises a number of fairing elements of airfoil cross-section, vertically spaced on the mast so as to be freely rotatable thereon in water lubricated bearings. The segmented fairings on the snorkel mast maintains hydrodynamic stability during high speed turns.
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