Mildly futuristic setting concerning technology, sparsely populated exoplanet with 3 atm. I'm looking for a cool, but very practical plane design. A photo of design that I thought about (from wikipedia) : (except that I think about a bit smaller ones) It looks as if such design had two features that made it destined to become a flying boat: -engines put highly, so would be out of reach of water; -front part of lowly put wings seem able to act as hydrofoil. From what I've read modern passenger planes easily stay afloat for a while, but the problem is water slowly seeping inside. Sticking all holes seems feasible. Could such design be adjusted easily to act as flying boat? I also thought about twin pressurized hulls to let it act as catamaran. Feasible?