Search results
Results from the WOW.Com Content Network
In the PVR-BASC the discharged gas volume is a function of depth and breath volume. The passive addition occurs during each inhalation as the loop volume is deficient by the amount discharged. The volumetric ratio of discharged gas to exhaled gas volume varies with depth, and decreases as the pressure increases. [2]
The US Navy has used several decompression models from which their published decompression tables and authorized diving computer algorithms have been derived. The original C&R tables used a classic multiple independent parallel compartment model based on the work of J.S.Haldane in England in the early 20th century, using a critical ratio exponential ingassing and outgassing model.
Depth on a rebreather; Depth in a cave on a rebreather; Depth at altitude on a rebreather; Depth running a line; He used a Mk15.5 with Juergensen Marine Hammerhead electronics and the following gas mixtures: trimix 4/80, 10/70, 15/55, 17/40, 26/25, air, nitrox50, 100% oxygen. The cave elevation was 1,550 metres (5,090 ft) and the dive duration ...
[1] [2] [3] The equivalent air depth, for a given nitrox mix and depth, is the depth of a dive when breathing air that would have the same partial pressure of nitrogen. So, for example, a gas mix containing 36% oxygen (EAN36) being used at 27 metres (89 ft) has an EAD of 20 metres (66 ft).
Before the advent of nautical charts in the 14th century, navigation at sea relied on the accumulated knowledge of navigators and pilots.Plotting a course at sea required knowing the direction and distance between point A and point B. Knowledge of where places lay relative to each other was acquired by mariners during their long experience at sea.
The Experimental Test Pool is a 50,000-US-gallon (190,000 L) capacity freshwater tank measuring 15 ft (4.6 m) by 30 ft (9.1 m) by 15 ft (4.6 m) deep, capable of sustaining temperatures from 34 to 105 °F (1 to 41 °C). It is designed and constructed for manned, shallow water testing and for supporting workup dives for the Ocean Simulation Facility.
The Lambertsen Amphibious Respiratory Unit (LARU) is an early model of closed circuit oxygen rebreather used by military frogmen. Christian J. Lambertsen designed a series of them in the US in 1940 (patent filing date: 16 Dec 1940) and in 1944 (issue date: 2 May 1944). [1]
The extra topweight of the helicopter required the return of the American Mk 33 3-inch gun over the heavier 3-inch/70 caliber guns used on the preceding class. [4] The guns could fire 45 – 50 rounds per minute with a lifespan of 2,050 rounds. [ 5 ]