alistairolsen
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| posted on 24/5/11 at 02:25 PM |
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Does anyone run a carbon prop?
If so, was it significantly more expensive than a steel one?
cheers
My Build Thread
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Steve Hignett
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| posted on 24/5/11 at 02:31 PM |
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about 1200 quid
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blakep82
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| posted on 24/5/11 at 02:34 PM |
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^ yep, and for what? can't see its going to give any real benefit.
when i took bits off an old american van (1986 i think it was?) it has a plastic prop. don't think its carbon, but i would like to know what it
is
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r1_pete
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| posted on 24/5/11 at 02:34 PM |
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some discussion on scoobynet Here
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Mr Whippy
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| posted on 24/5/11 at 02:35 PM |
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bargain  not
Fame is when your old car is plastered all over the internet
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scootz
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| posted on 24/5/11 at 02:40 PM |
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The Mazda RX8 has a carbon prop.
I bought one from a scrappy ages ago to see if I could customise it, but all the carbon companies I spoke to said it was a non-starter.
It's Evolution Baby!
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Mr Whippy
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| posted on 24/5/11 at 02:42 PM |
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quote:
Originally posted by scootz
The Mazda RX8 has a carbon prop.
I bought one from a scrappy ages ago to see if I could customise it, but all the carbon companies I spoke to said it was a non-starter.
probably bonded togeather so you'd destroy it trying to remove the ends
tbh most of the weight in a propshaft is in the joints and the sliding shaft, the tube is usually very thin walled
[Edited on 24/5/11 by Mr Whippy]
Fame is when your old car is plastered all over the internet
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britishtrident
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| posted on 24/5/11 at 02:58 PM |
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The Renault Espace 4x4 used a GPR propshaft I think is was really a technology demonstration exercise by Matra who designed built the Espace.
Real advantage was it gave increased torsional elasticity.
From university istr GRP or Kevlar or a combination of the two would the choice for propshafts, production method is to take the two ends and
join them by a former such as an alloy tube and rotate it between centres on a lathe like machine, the pre-wetted fibre fillament is wound round at
pre-defined pitch ----- a bit like screw cutting on lathe but adding material, the next layer of fibre is then wound on in the opposite
direction.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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alistairolsen
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| posted on 24/5/11 at 03:20 PM |
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Im not interested in the weight saving, more the way they fail, if and when.
I hadnt realised the cost was quite so high though!
My Build Thread
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nick205
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| posted on 24/5/11 at 03:21 PM |
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Other than the bragging rights and possible benefits on a serious race car I just fail to see the point over a steel one. As Whippy points out most
of the weight is in the joints anyway. From an EoL recycling perspective a steel one makes more sense too.
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nick205
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| posted on 24/5/11 at 03:23 PM |
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quote:
Originally posted by alistairolsen
Im not interested in the weight saving, more the way they fail, if and when.
I'd guess that they shatter or the bonded joints come apart.
Once broken I guess they might be safer than a steel prop in that the still rotating end would probably disintegrate in the tunnel rather than the
major damage a broken steel one can inflict?
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blakep82
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| posted on 24/5/11 at 03:28 PM |
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go to about 24 minutes into this
http://www.bbc.co.uk/iplayer/episode/b011dcb2/Richard_Hammonds_Engineering_Connections_Series_3_Formula_1/
it was on last week, will show you just about everything mentioned here (construction, approx cost etc)
it takes a lot more torque before it breaks, but it shatters rather than bending and twisting like steel.
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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alistairolsen
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| posted on 24/5/11 at 03:29 PM |
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quote:
Originally posted by blakep82
it takes a lot more torque before it breaks, but it shatters rather than bending and twisting like steel.
exactly
My Build Thread
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Doctor Derek Doctors
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| posted on 24/5/11 at 03:47 PM |
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This is the legacy of kids growing up playing Gran Tourismo..... a Carbon Fibre propshaft (400 credits if I remember) was a bargain upgrade for all
cars.................... even if they were FWD and didn't have a prop!
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r1_pete
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| posted on 24/5/11 at 04:02 PM |
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It could create a market for transparrent tranny tunnels....
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Steve Hignett
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| posted on 24/5/11 at 04:12 PM |
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I should prob add to my price quote above, that the carbon prop manufacturer I know that sells them (exact price is £1163 IIRC), actually recommends
that they are replaced every year too...
Well of course they bloody do!!!
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iank
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| posted on 24/5/11 at 04:30 PM |
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quote:
Originally posted by Steve Hignett
I should prob add to my price quote above, that the carbon prop manufacturer I know that sells them (exact price is £1163 IIRC), actually recommends
that they are replaced every year too...
Well of course they bloody do!!!
Why did that comment remind me of this? http://www.youtube.com/watch?v=pBUzw-0ev_A
--
Never argue with an idiot. They drag you down to their level, then beat you with experience.
Anonymous
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Neville Jones
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| posted on 25/5/11 at 11:27 AM |
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I made a number of carbon prop shafts many moons ago. To do the job properly, you need to know the length between joints, and max torque, so that the
fibres can be properly oriented.
Off the shelf jobs will have the fibres oriented at what is most convenient for the maker.
Another point to be aware of, is that the cfrp prop will be less compliant, springy, and will impart greater shock loads into the system, causing
joint failure and possibly early gear failure. This was certainly the case on the car gears, and oddly enough, the grinder gears on racing yachts.
If using one, it should definitely be 'lifed', and same goes for everything it's attached to. The only way around this, is to use
rubber donut type joints, but their weight then negates the use of the carbon. Another solution is to use the system where the tube is an inner and
outer, with a flexible joining compound. But again, this negates the use of carbon to save weight.
Kevlar, and one or two other aramids and synthetics worked out to be the best compromise, but they showed to be very difficult to get the resins to
adhere to.
Cheers,
Nev.
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alistairolsen
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| posted on 25/5/11 at 11:30 AM |
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quote:
Originally posted by Doctor Derek Doctors
This is the legacy of kids growing up playing Gran Tourismo..... a Carbon Fibre propshaft (400 credits if I remember) was a bargain upgrade for all
cars.................... even if they were FWD and didn't have a prop!
With all due respect: No, it isn't
My Build Thread
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Doctor Derek Doctors
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| posted on 25/5/11 at 12:40 PM |
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quote:
Originally posted by alistairolsen
quote:
Originally posted by Doctor Derek Doctors
This is the legacy of kids growing up playing Gran Tourismo..... a Carbon Fibre propshaft (400 credits if I remember) was a bargain upgrade for all
cars.................... even if they were FWD and didn't have a prop!
With all due respect: No, it isn't
It was a joke, at the expense of Gran Turismo.
Calm down dear. 
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