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A supervisors knowledge of Archimedes principles is absolutely essential. Particularly with the use of lift-bags.
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•A Bell has a diameter of 2.5 m. What is its up-thrust ?
– 4/3 x 3.142 (π) x (radius)3
– 4/3 x 3.142 (π) x 1.25³
– = 8.18 m3
–Upthrust = Volume x Density
= 8.18 m3 x 1.03 t/m³ (sea water)
= 8.43 tonnes.

- IMCA D016 -Guidance on open parachute type underwater air lift bags
- IMCA D022-ver2 2016 DIVE SUPERVISORS MANUAL.
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A.D.S. Exam Prep Course
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