Yeah, the 60 minute jumbo D would be nice. But DAN's cost is $150 more than the 20 minute M9 cylinder.
Ooooch.
Plus the jumbo D weighs 30 lbs, and the M9 is only about 13 lbs. Since my wife is kinda tiny, I think the smaller one might be better. Can't see her trying to run with 30 lbs from the car down to the beach. Some of the places we dive are a pretty long haul, down steep cliffs from the parking lot.
Mccabejc,
Were are you getting your weight numbers from? I'm not trying to get anything started but here are the numbers I have on tanks:
M-6 specs:
Oxygen Capacity - 170 liters
PSI - 2216
Cylinder length - 11.59 in (294 mm)
Cylinder Diameter - 3.2 in (81 mm)
Weight - 2.2 lbs (1 kg)
D specs:
Oxygen Capacity - 425 liters
PSI - 2015
Cylinder length - 16.51 in (419 mm)
Cylinder Diameter - 4.38 in (111 mm)
Weight - 5.3 lbs (2.41 kg)
Jumbo D specs:
Oxygen Capacity - 640 liters
PSI - 2015
Cylinder length - 16.30 in (414 mm)
Cylinder Diameter - 5.25 in (133 mm)
Weight - 8.1 lbs (3.68 kg)