Rocket Main Tank
From NPrize
Rocket Fuel tanks
In modern launchers, two tanks are used, one for fuel and one for the oxidizer, but it has not always been the case. The redstone rocket for example used a single tank with an internal separation, as we can see below.
Sloshing and other effects
Special care must be taken to avoid sloshing and vortexes in the tanks, that may lead to bubbles in propellant flow.
