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Воздушный габарит
Определение
Высота самой высокой точки судна, обычно клотика, над ватерлинией. Сравнивается с просветами под мостами и силовыми кабелями.
Воздушный габарит in practice
Air draught is the vessel's height above the water. Bridge clearances on charts are given above Highest Astronomical Tide (HAT), so the real clearance is usually more than charted.
Clearance under a bridge = charted clearance + (HAT − height of tide). Allow a safety margin for antennas, wind instruments and waves.
Common questions
- Where can I find my boat's air draught?
- In the manufacturer's specifications. Add any masthead instruments, antenna or wind vane.
- Are overhead power cables dangerous?
- Yes. Electricity can arc across a gap, so charted safe clearances must be respected.