reb
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| posted on 25/2/19 at 09:40 AM |
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Propshaft catcher placement
Hi,
I have a very long 2-piece propshaft for my bike powered kit car.
Front half is ~50cm and rear part ~80 cm long, there is a middle bearing on the rear part of the front half.
I would like to install several prop catchers in case the propshaft fails to avoid personal inury.
Can you advise me where the ideal locations are to place them?
I read to place such prop catchers close to the U-Joints as those usually fail first.
Hence I would like to place a prop catcher close to the engine/gearbox flange and one close to the differential flange.
But what about the central u-joint which is holding both propshaft halves together?
Would I need to place two prop catchers there on each side of the U-joint?
Or do I only need one prop catcher on one side, as the middle bearing acts as prop catcher on the other side?
How far from the U-joint should the propcatcher be ideally located? I assume the ideal location would be a couple of cm away from the u-joint, on the
tube side?
How much larger does the diamater of the hole in the prop catcher has to be compared to the propshaft? Is a 20mm larger diamater sufficient?
Can you recommend the thickness of such a prop catcher? Is 3mm mild steel with M8 8.8 bolts sufficient?
[Edited on 25/2/19 by reb]
[Edited on 25/2/19 by reb]
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designer
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| posted on 25/2/19 at 11:16 AM |
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If all joints are the same quality, it is the front which will break because it's where power is initially driven into the driveshaft.
I always put mine just behind the front joint. Usually about six inchs, on a shorter shaft just move it a touch nearer.
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loggyboy
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| posted on 25/2/19 at 11:52 AM |
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2, 1 at each end is the simplest way to be sure.
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