Anatomy of a DPV

Sport Diver - - Training -

Con­trols: Most mod­els use a trig­ger mech­a­nism to ac­ti­vate propul­sion. Other user in­ter­faces can in­clude speed con­trol, lights and cam­era at­tach­ments.

Pro­pel­ler: Safety is in­creased with pro­tec­tive hous­ings to pre­vent ac­ci­den­tal ap­pendage in­tru­sion. Some tech­ni­cal-div­ing mod­els, how­ever, have open de­signs to re­duce drag and in­crease per­for­mance.

Bat­tery: Power sources range in ma­te­rial from nickel-cad­mium to lithium-ion, of­fer­ing a range from as lit­tle as 15 min­utes to sev­eral hours. And it’s all sealed with thick O-rings that must be care­fully in­spected and lu­bri­cated af­ter every charge.

Buoy­ancy: To suit the diver’s pur­pose, most mod­els can be ad­justed from slightly buoy­ant to pre­vent loss, to com­pletely neu­tral for max­i­mum ef­fi­ciency and slightly neg­a­tive for sta­ble park­ing.

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