multiStageDeltaV = function(stages, isp, fuel, dryMass) {
const masses = [dryMass];
const dvs = [0];
for(let i=1; i <= stages; i++) {
const stageDryMass = masses[i-1] + simmetry*emptyFuelTankMass + simmetry*decouplerMass;
const stageFuelMass = simmetry*fuel;
dvs.push( stageDeltaV( isp, stageFuelMass , stageDryMass) );
masses.push(stageDryMass + stageFuelMass);
}
return {masses, dvs};
}