Originally Posted by captnjack
I tried this with my halkey roberts valves. Its didn't really work and the tube pressures ended up uneven. I don't totally understand why; I stopped testing because one tube was consistently over pressure and I was afraid of damaging it. I suspect the spring pressures between valves were significantly different and the air was preferentially taking the path of least resistance.
I use a scuba tank to fill my valves off a BC inflator hose. Making a BC nipple to boat valve adapter was one of my best ever projects. I can top up my 15.5 ft boat with a 13cf airgon bottle. If it needs more than topping up I use an old 1800psi lp50 that a friend gave me.
I think 2x gal is about right. I have a single 12 gal tank and rarely even use 1/2 of it.
The FC470 is a Zodiac Milpro boat. It is also known as the "Futura Commando". Mine is a military surplus model and is equipped with the "rapid inflation" system. However, I'm missing the bottle, regulator, hoses, and adapter. I do have installed the OPVs, inlet check valve, and the wrap that secures the bottle near the transom.
Basically, for a mere $2000, you can purchase a SCUBA 1st stage, two QD hoses, and two special adapters. The entire boat can be filled with an AL80 / 12L tank. It actually overpressurized the boat, and the OPVs let out the excess.
I'm simply missing the Zodiac kit...However, I have a junk old Sherwood Brut 1st stage, a few BC hoses, and access to fittings.
A machinist friend of mine is going to turn some adapters for me...inlet check valve-to-1/4 NPT. Then I'm going to get some 1/4 NPT BC fittings. Click click and I can inflate the whole boat easily for less than $200.
The FC470 has special intercommunicating valves. You rotate the valve and it has settings. You can inflate chamber A, inflate chamber B, both chambers, or neither chamber. It has 4 of these valves. If all are set to "both" you can inflate the entire boat from one valve.
The twin 6 gallon also mandates a turn point!
Originally Posted by jyasaki
Yeah; should have mentioned that...
Sounds reasonable. I'd look at it more as a 6 gallon, with an additional 6 as an as needed option. Doubt you'll be burning more than 6 gallons on a trip on a regular basis (but that depends on your trip planning.) My SIB used to run all weekend on a 6 gallon tank.
A typical dive trip around here is about 16 miles round trip. That translates to about 1.5-3 gallons of fuel. That means I can have a good size reserve with a single 6 gallon, yet without compromising weight!
This is the boat!
And now the secret is out...yes, I work for an inflatable boat dealer. Lately, we have been selling a lot of smaller AB inflatables. We deal Zodiac, Achilles, Mercury, and Newport Vessels (cheapo chinese boats). I am the primary sales monkey. I am also the secondary repair guy.