A propeller-hub assembly for a vertical take-off and landing (VTOL) aircraft, the propeller-hub assembly having a rotational axis, and comprising: a plurality of propeller blades; a motor arranged between a propeller-hub and a plate; a push rod positioned in a rotational axis along the propeller-hub assembly, wherein the push rod is movable along the rotational axis of the propeller of the propeller hub assembly, characterized by that the propeller-hub assembly further comprising: a bedplate operably associated with the propeller-hub to fold or respectively unfold the plurality of propeller blades; a device, said device being a compression spring or an electromagnetic, pneumatic or hydraulic device working on the principle of servo motors or linear actuators, for maintaining a force between a spinner and the bedplate, the device is arranged within the spinner and operably associated with the bedplate; the push rod operably associated with the device; a restraint plate by virtue of the push rod operably associated with the device, where if the push rod is being pushed by the restraint plate the device enables the propeller blades to fold into a stowed position, if the motor is not running, or, if the motor is running, due to the action of centrifugal force, the propeller blades are forced into an expanded position; wherein the push rod extends from the bedplate up to the restraint plate and is movable along the rotational axis of the propeller-hub assembly; wherein the propeller-hub assembly is rotatably arranged in respect to the restraint plate. a plurality of propeller blades; a motor arranged between a propeller-hub and a plate; a push rod positioned in a rotational axis along the propeller-hub assembly, wherein the push rod is movable along the rotational axis of the propeller of the propeller hub assembly, characterized by that the propeller-hub assembly further comprising: a bedplate operably associated with the propeller-hub to fold or respectively unfold the plurality of propeller blades; a device, said device being a compression spring or an electromagnetic, pneumatic or hydraulic device working on the principle of servo motors or linear actuators, for maintaining a force between a spinner and the bedplate, the device is arranged within the spinner and operably associated with the bedplate; the push rod operably associated with the device; a restraint plate by virtue of the push rod operably associated with the device, where if the push rod is being pushed by the restraint plate the device enables the propeller blades to fold into a stowed position, if the motor is not running, or, if the motor is running, due to the action of centrifugal force, the propeller blades are forced into an expanded position; wherein the push rod extends from the bedplate up to the restraint plate and is movable along the rotational axis of the propeller-hub assembly; wherein the propeller-hub assembly is rotatably arranged in respect to the restraint plate. a bedplate operably associated with the propeller-hub to fold or respectively unfold the plurality of propeller blades; a device, said device being a compression spring or an electromagnetic, pneumatic or hydraulic device working on the principle of servo motors or linear actuators, for maintaining a force between a spinner and the bedplate, the device is arranged within the spinner and operably associated with the bedplate; the push rod operably associated with the device; a restraint plate by virtue of the push rod operably associated with the device, where if the push rod is being pushed by the restraint plate the device enables the propeller blades to fold into a stowed position, if the motor is not running, or, if the motor is running, due to the action of centrifugal force, the propeller blades are forced into an expanded position; wherein the push rod extends from the bedplate up to the restraint plate and is movable along the rotational axis of the propeller-hub assembly; wherein the propeller-hub assembly is rotatably arranged in respect to the restraint plate.