Main reason is to allow for the dynamics of the drivetrain.
Secondary reason is to allow the shaft to collapse in a crash.
movement for the suspension
Slip JointThe propeller shaft has to meet both of the changes i.e., the angular change coming between the gear box and differential and the change in length of the distance between the gear box and differential. The propeller shaft is also not on the same line as the gear box output shaft but it runs to the rear axle at an angle because the level of the rear axle is lower than the gear box.¾ To adjust 'angular motion', universal joints are provided.¾ To adjust for the change in length of the propeller shaft, a slip joint is provided.
via the slip joint.
The universal joint is used to transfer drive (power) from one shaft to another when they are inclined (non collinear) to each other.
The spinning shaft from the engine to which the propeller is attached.
why propeller shaft are made hollow
I dont believe a 2003 Sentra has a propeller shaft because it is a front wheel drive vehicle. Only rear wheel drive vehicles truly have a propeller or DRIVE shaft. It runs down the center of the vehicle, length ways, connecting the output end of the transmission to the input end of the differential.
Weight savings.
automobile propeller shaft material
driving shaft, propeller shaft, Cardan shaft
Loser loner major wannabee
important reason behind inclining the shaft is to avoid/reduce various vibrations that may come up from the propeller and shaft rotation. various rulebooks have the minimum clearances for hull/propeller, so when the hull and propeller are designed and the minimum clearances are not satisfied shaft are inclined. other reasons include better positioning of engine bearers, better flow angle to the propeller blades