I believe 1cc of water weighs 1g, so 1L weighs 1kg (1L = 1 cubic decimeter = 1000cc).

You said that WS = 11+ pounds for your sub, so you need to calculate or guesstimate WDW and then you can find WB. WS = dry weight of sub (empty ballast tank) So lets define some variables and write some equations. So my simple minded approach is to figure out how much weight/ballast you have to add to get you total sub weight > water displacement weight. If you have WTCs inside and flood the hull, you need to calculate the WTC volume (based on exterior dimensions, not interior) and guesstimate the total volume that the hull material takes up (maybe you can neglect this, especially if the hull material itself has close to neutral buoyancy). If your entire hull is water proof, then you just need to caculate the volume of the hull. So the hard part is figuring out the volume of water your sub will displace. This means if your sub displaces two gallons of water when totally submersed, then it will sink if it weighs more than two gallons of water, and it will float if it weighs less than two gallons of water.

Well, I know next to nothing about RC subs right now, but since you haven't gotten a response yet, here's how I'd figure it out.įirst, recognize that neutral buoyancy means the weight of your sub must equal the weight of the water displaced by your sub.

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