A powertrain for a vehicle capable of land and aerial transportation , the powertrain comprising: an engine having at least one output shaft ; a primary clutch mechanism coupled to the at least one output shaft of the engine in a manner such that a driving member of the primary clutch mechanism is rotatable by the at least one output shaft of the engine; a main drive shaft assembly coupled to a driven member of the primary clutch mechanism, wherein the primary clutch mechanism is operable to engage or disengage the driven member of the primary clutch mechanism and the driving member of the primary clutch mechanism so as to connect or disconnect the main drive shaft assembly and the at least one output shaft of the engine; an axle shaft coupled transversely to the main drive shaft assembly and driven by the main drive shaft assembly; a secondary clutch mechanism coupled to an end of the axle shaft in a manner such that a driving member of the secondary clutch mechanism at the end of the axle shaft is rotatable by the axle shaft; a drive wheel coupled to a first driven member of the secondary clutch mechanism, wherein the secondary clutch mechanism is operable to engage or disengage the first driven member of the secondary clutch mechanism and the driving member of the secondary clutch mechanism so as to connect or disconnect the drive wheel and the axle shaft; and an air propulsion unit coupled to a second driven member of the secondary clutch mechanism, wherein the secondary clutch mechanism is operable to engage or disengage the second driven member of the secondary clutch mechanism and the driving member of the secondary clutch mechanism so as to connect or disconnect the air propulsion unit and the axle shaft. an engine having at least one output shaft ; a primary clutch mechanism coupled to the at least one output shaft of the engine in a manner such that a driving member of the primary clutch mechanism is rotatable by the at least one output shaft of the engine; a main drive shaft assembly coupled to a driven member of the primary clutch mechanism, wherein the primary clutch mechanism is operable to engage or disengage the driven member of the primary clutch mechanism and the driving member of the primary clutch mechanism so as to connect or disconnect the main drive shaft assembly and the at least one output shaft of the engine; an axle shaft coupled transversely to the main drive shaft assembly and driven by the main drive shaft assembly; a secondary clutch mechanism coupled to an end of the axle shaft in a manner such that a driving member of the secondary clutch mechanism at the end of the axle shaft is rotatable by the axle shaft; a drive wheel coupled to a first driven member of the secondary clutch mechanism, wherein the secondary clutch mechanism is operable to engage or disengage the first driven member of the secondary clutch mechanism and the driving member of the secondary clutch mechanism so as to connect or disconnect the drive wheel and the axle shaft; and an air propulsion unit coupled to a second driven member of the secondary clutch mechanism, wherein the secondary clutch mechanism is operable to engage or disengage the second driven member of the secondary clutch mechanism and the driving member of the secondary clutch mechanism so as to connect or disconnect the air propulsion unit and the axle shaft. <EOS>