NAVY21
Contributor
well Ive had my MK25 (DIN) down to under 35 degrees without any freezing problems. I keep hearing people badmouth the MK25 for freezing.
The problem most people have is that they take that first pre-breath/purge in their reg on the beach/boat 5 minutes before they are in the water. The 1st stage's large thermal veins extract heat from the water and allow it reamain warmer longer , but cannot do the same on the beach because most of the time in cold water diving the air is colder then the water and ofcourse much less dense (as we know from basic thermodynamics that there is no such phenomenon as cold--only heat and its loss of energy). Because there is no way to extract heat effectively from air the 1st stage's heat loses its energy and drops in temperature--leading to free flow.
also, wait until you are in the water to change the 2nd stage setting from predive to dive; and to play with flow control.
The problem most people have is that they take that first pre-breath/purge in their reg on the beach/boat 5 minutes before they are in the water. The 1st stage's large thermal veins extract heat from the water and allow it reamain warmer longer , but cannot do the same on the beach because most of the time in cold water diving the air is colder then the water and ofcourse much less dense (as we know from basic thermodynamics that there is no such phenomenon as cold--only heat and its loss of energy). Because there is no way to extract heat effectively from air the 1st stage's heat loses its energy and drops in temperature--leading to free flow.
also, wait until you are in the water to change the 2nd stage setting from predive to dive; and to play with flow control.
