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Author: Subject: Should have fitted a prop catcher !
NigeEss

posted on 12/11/13 at 12:49 AM Reply With Quote
Should have fitted a prop catcher !

Fortunately it stayed within the confines of the tunnel.




[img][/img]





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dhutch

posted on 12/11/13 at 06:33 AM Reply With Quote
Cant see the video at work, but I keep meaning to fit one of these!
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kj

posted on 12/11/13 at 07:10 AM Reply With Quote
a bit of a shock eh





Think about it, think about it again and then do it.

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daniel mason

posted on 12/11/13 at 07:12 AM Reply With Quote
i wondered what had gone on when i saw you pulled over!






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adithorp

posted on 12/11/13 at 07:41 AM Reply With Quote
Didn't realise thats what happened. It could have been a lot worse but would have been better with a catcher. What did it batter?





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iank

posted on 12/11/13 at 08:00 AM Reply With Quote
Easy to lose a leg or worse. Glad you got away with it!





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Anonymous

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jamesbond007ltk

posted on 12/11/13 at 08:07 AM Reply With Quote
Perhaps very lucky it was not far more catastrophic. Did it fail front or back?

Can I ask, who made your prop?


Sorry in advance for the hi-jack:

As a general question has there ever been any patterns identified with prop failures such as gearbox/diff combinations, alignment angles, prop manufacturer etc? When i first built my car I made my own from a sierra prop. It was only ever meant to be temporary, in fact just for testing, but ended up doing about 2,000 miles before taking the car off the road for other reasons. Other than a noticeable imbalance at high speed I never had any problems with it.

I have always told myself I would replace it and now my rebuild is nearing completion I have been looking at my options. I am just rather concerned that professionally manufactured props seem to fail all too often.

Rich

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Jon Ison

posted on 12/11/13 at 08:26 AM Reply With Quote
Sound doesn't do that justice, I was in the garage at the time my first thoughts was someone was going down the pit straight either scraping the wall or upside down, it was very loud.

I had one fail at Cadwell top of the mountain, fortunately have a prop catcher in the tunnel, anyone thinking about it get one, flailing prop shafts have no mercy.

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pif

posted on 12/11/13 at 08:36 AM Reply With Quote
the sound on that video reminded me of mine coming off. Horrible sound.

Lucky to get away with no injury and damage to car doesnt look to bad.

You will soon be back on the road.





been a bit of a rush job really, bodged it all together in just 5 1/2 years.

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DavidW

posted on 12/11/13 at 08:46 AM Reply With Quote
That reminds me that I was going to do this over the winter. Thanks for sharing and I'm glad you're ok.

Now to find the threads and work out where I put the catcher - front or back?

David

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loggyboy

posted on 12/11/13 at 08:47 AM Reply With Quote
quote:
Originally posted by jamesbond007ltk
Perhaps very lucky it was not far more catastrophic. Did it fail front or back?



Front by the looks of the damage adjacent to the gearbox output.





Mistral Motorsport

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loggyboy

posted on 12/11/13 at 08:49 AM Reply With Quote
quote:
Originally posted by DavidW
That reminds me that I was going to do this over the winter. Thanks for sharing and I'm glad you're ok.

Now to find the threads and work out where I put the catcher - front or back?

David

No reason not to do both IMO - I have.

Lots of search results - linky





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Dick Axtell

posted on 12/11/13 at 09:52 AM Reply With Quote
quote:
Originally posted by NigeEss
Fortunately it stayed within the confines of the tunnel.

[img][/img]


NigeEss, you appear to be one lucky chap!! Judging from your pic, it seems to be a front end failure of ur p/shaft. Do you have a more detailed pic of the failed area? What type of coupling/adapter did you fit between shaft and bike 'box?

Re-watching your vid, from the sound I'd guess that you weren't anywhere near full chat. If you had been, damage might have been worse.

[Edited on 12/11/13 by Dick Axtell]





Work-in-Progress: Changed to Zetec + T9. Still trying!!

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Peteff

posted on 12/11/13 at 09:57 AM Reply With Quote
If it fails at the front it will flail till the wheels stop turning at whatever speed you are doing whereas the rear will be driven by the engine on tickover if you lift off.





yours, Pete

I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.

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iank

posted on 12/11/13 at 10:09 AM Reply With Quote
If the front fails there is a small chance the prop can dig into the road ripping the rear axle/diff off and throwing the car violently in a random direction. Fit both.





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Anonymous

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Slimy38

posted on 12/11/13 at 10:10 AM Reply With Quote
quote:
Originally posted by Peteff
... whereas the rear will be driven by the engine on tickover if you lift off.


Or if you have enough wits about you, you could dip the clutch and it would stop completely?

I'd say if you can only fit one, a front one would be the best choice.

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mcerd1

posted on 12/11/13 at 10:38 AM Reply With Quote
quote:
Originally posted by Slimy38
quote:
Originally posted by Peteff
... whereas the rear will be driven by the engine on tickover if you lift off.


Or if you have enough wits about you, you could dip the clutch and it would stop completely?

I'd say if you can only fit one, a front one would be the best choice.


^^ your not wrong - but how long have you really got to get your foot on the clutch ?

...better to find a way to fit one at both ends

[Edited on 12/11/2013 by mcerd1]





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unijacko67

posted on 12/11/13 at 10:55 AM Reply With Quote
You were certainly lucky, I need to fit a prop catcher, but it keeps getting pushed to the back of the list along with the towing eye's and fire extinguisher. Was good to meet you at Oulton.





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pif

posted on 12/11/13 at 10:59 AM Reply With Quote
Mine came off at the front and smashed the clutch cylinder so no dipping that although it was irrlevant as it came off at the front. BTW it wiped out the Brake master cylinder too so no foot brake either.

IIRC it took 2 water pipes, fuel line, chunk of block and all the engine bay / dash wiring too.

HO HO, that was a day to remember.

But it didnt take me or my 7 year old sat in passenger seat............





been a bit of a rush job really, bodged it all together in just 5 1/2 years.

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iank

posted on 12/11/13 at 12:17 PM Reply With Quote
quote:
Originally posted by mcerd1
quote:
Originally posted by Slimy38
quote:
Originally posted by Peteff
... whereas the rear will be driven by the engine on tickover if you lift off.


Or if you have enough wits about you, you could dip the clutch and it would stop completely?

I'd say if you can only fit one, a front one would be the best choice.


^^ your not wrong - but how long have you really got to get your foot on the clutch ?

...better to find a way to fit one at both ends

[Edited on 12/11/2013 by mcerd1]


And can you keep it pressed with a prop flailing its way through your left leg





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Anonymous

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Johneturbo

posted on 12/11/13 at 12:55 PM Reply With Quote
Very scary and a horible sound

i had mine snap at the front as i accelerated from 40 zone to 60 zone thankfuly no injurys to me or lisa

but the car was a right off as it hit a fuel line and burt to the ground

mine snapped at the front UJ nuckle

[Edited on 12/11/13 by Johneturbo]

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daveb666

posted on 12/11/13 at 01:47 PM Reply With Quote
Being new to kit cars I'd never really heard of this problem until now.

Has anyone used the ones that DAnST engineering sell?

http://www.locostbuilders.co.uk/viewthread.php?tid=156382

Seem cheap for the potential damage that could be caused..





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Not Anumber

posted on 12/11/13 at 03:01 PM Reply With Quote
I had one go on a Pilgrim Sumo Cobra replica once at the rear UJ. The thing hit the road and lifted the back of the car into the air slightly- presumably this would have been rather worse if i was doing 70 rather than just 30mph at the time.

I put that experience down to the odd design of that car, the prop ran at wild angle to an off centre diff. Presumably in most kit though theres no reason why a prop should fail any more frequently than in any other rwd car.






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loggyboy

posted on 12/11/13 at 03:19 PM Reply With Quote
quote:
Originally posted by Not Anumber
Presumably in most kit though theres no reason why a prop should fail any more frequently than in any other rwd car.


Except most kit props are modified and most 'other' rwd will have 'manufactured' props. Not that a good one of either is better than the other, just more chance of having a weakness in a modified one.





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Not Anumber

posted on 12/11/13 at 03:32 PM Reply With Quote
I could see that would be the case if kit car prop shafts tended to fail on the welds where they had been cut and shut but they always seem to go on the UJs though.

Is it to do with the joints having to handle significantly more power than they were built to withstand and is there any real solution ?






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