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It allows a reduction in transmission tunnel height.The critical speed of the total prop shaft arrangement is higher without increasing the diameter (reducing shaft whip).
1) More torque can be put through the shaft 2) Can be used on longer Vehicles Without the whiping effect Akray
1) Drive-shafts are used on FWD but Prop-Shafts are used on RWD or 4WD. 2)A Drive-Shaft has final drive via a CV joint but a Prop-Shaft has final drive via a Differential. 3)A Drive-Shaft is smaller, lighter and saves space by not having a transmition tunnel.
Unbolt the prop shaft.
This would depend greatly on your prop shaft... Water craft, Airplane... Car? But two test that should apply to all categories might be: vibration and fatigue.
right behind the prop, on the same shaft
About half a stone give or take a few pounds
This depends entirely on what make model and year the machine is as well as why it is being driven. It is not safe to use it as a loader with the prop shaft missing, but it might be if it is just being moved.
About 3 foot
Before you change out the shaft of your champ, you are going to want to have a exacto knife, needle nose pliers, a new prop shaft with or without the gear attached, and a new prop. First cut the tap holding the fuselage to the wings, then gently hold the clear end piece with the pliers toward the center of the motor, and turn the shaft clockwise while holding that. The shaft should be disconnected from the motor, but trapped by styrofoam. So, take your exacto knife and make a big enough gap for the shaft and gear to get out. Then take your new prop-shaft and gear, and if the gear came on the shaft just pull it off, and put super glue where the gear was (On the straight threads under a little nub on the propeller) and slide the gear on. Let Dry. Then thread your new propeller, flat part of threads toward the gear. then take your completed shaft and place it back into the motor. Take your new or old end cap and twist it back on the end of the shaft. Re-tap the fuselage and you are ready to go!
The shaft itself rarely needs to be replaced, but it is often cheaper to replace than repair. The only thing that `requires`replacement of the shaft is if the shaft itself is bent or damaged. Joints, slip yokes and such can be changed.
The Prop shaft (front drive shaft) has a ball type cv joint that sits in bearings that connects to the transfer case. This is most likely shot and you need a front prop shaft (front drive shaft) complete with rubber boot and differential cv universal joint.