A coaxial, dual rotor system connected to a gearbox, the system comprising: a first rotor assembly disposed at a rotor axis and which imparts a first axial load and a first moment; a first rotor shaft operably connected to the first rotor assembly at the rotor axis to drive rotation of the first rotor assembly about the rotor axis; a first bearing assembly comprising a first rotor shaft bearing disposed at the base of the first rotor shaft and supportive thereof and connecting the gearbox to the first rotor shaft and which transfers the first axial load from the first rotor shaft to the gearbox; a second rotor assembly disposed at the rotor axis and which imparts a second axial load and a second moment; a second rotor shaft operably connected to the second rotor assembly at the rotor axis to drive rotation of the second rotor assembly about the rotor axis, the second rotor shaft coaxial with and radially offset from the first rotor shaft; a second bearing assembly comprising a second rotor shaft bearing disposed at the base of the second rotor shaft and supportive thereof and connecting the gearbox to the second rotor shaft and which transfers the second axial load from the second rotor shaft to the gearbox; a nonrotating standpipe disposed at the rotor axis radially between the first rotor shaft and the second rotor shaft; and an intershaft bearing assembly disposed at the upper end of the second rotor shaft between the first rotor shaft and_the standpipe and which transfers the first and second moments from the first rotor assembly and the second rotor assembly to the standpipe using the first and second bearing assemblies. a first rotor assembly disposed at a rotor axis and which imparts a first axial load and a first moment; a first rotor shaft operably connected to the first rotor assembly at the rotor axis to drive rotation of the first rotor assembly about the rotor axis; a first bearing assembly comprising a first rotor shaft bearing disposed at the base of the first rotor shaft and supportive thereof and connecting the gearbox to the first rotor shaft and which transfers the first axial load from the first rotor shaft to the gearbox; a second rotor assembly disposed at the rotor axis and which imparts a second axial load and a second moment; a second rotor shaft operably connected to the second rotor assembly at the rotor axis to drive rotation of the second rotor assembly about the rotor axis, the second rotor shaft coaxial with and radially offset from the first rotor shaft; a second bearing assembly comprising a second rotor shaft bearing disposed at the base of the second rotor shaft and supportive thereof and connecting the gearbox to the second rotor shaft and which transfers the second axial load from the second rotor shaft to the gearbox; a nonrotating standpipe disposed at the rotor axis radially between the first rotor shaft and the second rotor shaft; and an intershaft bearing assembly disposed at the upper end of the second rotor shaft between the first rotor shaft and_the standpipe and which transfers the first and second moments from the first rotor assembly and the second rotor assembly to the standpipe using the first and second bearing assemblies.