What might be the result of too fast an ascent rate?
Should a lift bag rise at a rate faster than 10 feet per second, a phenomena known as velocity head may develop. This results when the force due to the upward motion reacts against the top face forming a pressure head, deforming the lift bag and causing it to become unstable. In an exreme situation this may cause the bag to dump air, lose buoyancy and return the load to the bottom.
