***WARNING*** Beware of Death by Driveshafts!!!! - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-03-2008, 09:25 PM   #1
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Default ***WARNING*** Beware of Death by Driveshafts!!!!

Just a heads up, be careful

Quote:
Originally Posted by Miataroadster.com
much safer than steel or aluminum driveshafts which can impale you through floorboard when they break (carbon fiber disintegrates into harmless ball of thread with no sharp edges to injure you)

http://miataroadster.com/drivetrain.html

Is this honestly possible, feasible?

Last edited by 91NApeewee; 07-03-2008 at 09:52 PM.
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Old 07-03-2008, 09:54 PM   #2
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Well, the idea is probably valid, but his wording is a bit off. First off, even a single layer of CF and resin will essentially shatter or break off into huge chunks with sharp edges that can most definitely hurt you. Second, when working with raw carbon cloth, it's highly recommended to use gloves, since the **** is like fiberglass in that slivers of it can get into your skin - but unlike fiberglass, the slivers work themselves in, not out. :(
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Old 07-03-2008, 10:09 PM   #3
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The force of the tq on the shaft at the moment of breaking would also need to be enough to rip through the floorboard, seat, etc... in order to successfully complete it mission of impalement. If you have seen the episode of mythbusters where they are trying to flip a car with the driveshaft like something out of a movie you would see that the driveshaft that they purposely broken mearly dented the bottom of the car.

Things like those driveshafts are made for HIGH hp drag cars mostly. Something you could do cheaper that drag cars do, and is required in most classes is create a driveshaft hoop to surround the shaft under the car. If it breaks, the hoop contains it.
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Old 07-03-2008, 10:11 PM   #4
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A broken driveshaft is NOT going to impale you.

Cut you in half, maybe, but not impale you.
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Old 07-03-2008, 10:31 PM   #5
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Quote:
Originally Posted by 91NApeewee View Post
Just a heads up, be careful

http://miataroadster.com/drivetrain.html

Is this honestly possible, feasible?
To: [email protected]

Subj: Driveshafts

Dear Sir,

While perusing your website today I noticed that you sell Carbon Fiber driveshafts and you note that these are safer than other steel and aluminum driveshafts. Interestingly, you sell steel driveshafts below the Carbon Fiber ones. Why would you knowingly sell a product that is likely to kill or maim your customers? I don't understand why you would expose your company to this sort of liability.

Mark

PS - Carbon Fiber Shards in F1 puncture tires and the CF brakes never ball up into harmless thread!
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Old 07-03-2008, 10:39 PM   #6
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Quote:
Originally Posted by neogenesis2004 View Post
The force of the tq on the shaft at the moment of breaking would also need to be enough to rip through the floorboard, seat, etc... in order to successfully complete it mission of impalement.

No, no, no. That'd be its mission of slicing.

Sitting under the car spinning, if it came apart somewhere along its length it'd just turn into a weedwacker from hell and pwn your legs and/or torso. That'd be slicing/chopping.

To impale you, it'd have to be doing something that would be more of a piercing/stabbing kind of thing.
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Old 07-03-2008, 10:57 PM   #7
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I was using the vocabulary from the quote, dismount my ******** please.
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Old 07-03-2008, 11:58 PM   #8
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It is for this reason that fast drag cars must run a driveshaft loop...

You're supposed to wear gloves when handling CF? I have nearly a whole roll of the stuff and it's never irritated my skin a bit.
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Old 07-04-2008, 12:05 AM   #9
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rx8 has a cf driveshaft stock.

And I can totally see the logic here. Things fly apart at high rpms/power, hence tranny safety nets. I mean I doubt any miatas are approaching driveshaft explosion levels.
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Old 07-04-2008, 12:49 AM   #10
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Old 07-04-2008, 01:02 AM   #11
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Ill have to wait for Mikef85s to chime in after he build his 1500hp miata.
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Old 07-04-2008, 08:34 AM   #12
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that driveshaft they sell is not made from carbon.
its simply wrapped.

its their heavier duty one, with a carbon wrap.
waste of time i reckon.

if it was all carbon id be interested, but its about 3kgs heavier than stock!
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Old 07-04-2008, 09:32 AM   #13
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i read this a few days ago and lol'd.

Its like a kennedy bullet. The drive shaft would have to break, then turn, then thrust forward. ******* tards.
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Old 07-04-2008, 02:35 PM   #14
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My friend broke his M3s drive shaft launching at the drag strip last year, it dented the HELL out of his floor pan but unless you are making some serious power, I don't think its that big of an issue of it slicing into the car.
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Old 07-04-2008, 02:49 PM   #15
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Quote:
Originally Posted by Saml01 View Post
Ill have to wait for Mikef85s to chime in after he build his 1500hp miata.
I have a feeling none of us will EVER need anything close to what is probably going in that car, LOL...plus is won't be anything compatible with a stock driveline anyway.
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Old 07-04-2008, 02:50 PM   #16
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Quote:
Originally Posted by hustler View Post
i read this a few days ago and lol'd.

Its like a kennedy bullet. The drive shaft would have to break, then turn, then thrust forward. ******* tards.



I know I am the one person on this earth that doesn't like cf. Yes it suposed to be stronger. Hit it with a hammer! See which is stronger.

All these guys buying cf rims for bikes.
When I roll out at 180 mph and hit a bump. I don't want anything that can shatter with blunt force. All of my friends bikes have uneven spots on their aluminum rims somewhere. And no specific incident to pin it too. Extreme force is on everything at that speed. Small bumps are huge, big curves are small. Some things cf is great, like fenders, mufflers, or hoods. But for rims or something I can high center during driving. I wouldn't want. Just my opinion.

Have you ever left a fiberglass ladder in the sun? They are supossed to be stronger than aluminum. But see how straight it is after all day in the sun @ 101 degrees. I hope cf does better in heat.
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Old 07-04-2008, 02:56 PM   #17
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the driveshaft would break through too far back; it might get you if you're sitting in the trunk. They tried this on mythbusters. Took a driveshaft, and had it fall off and get jammed in a ditch. All it did was screw up the differential, lift the car up like a pole vault, and bounce around.
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Old 07-04-2008, 03:43 PM   #18
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Big HP cars have been running these things for years. The carbon fiber is designed to hold loads in a direction and not others. If it is bent and force was put on it it turns back into dust and a hair like string, not going to kill anyone. Problem with them on road cars is if they get a rock chip they might disintegrate.

http://www.youtube.com/watch?v=a-Th6...elated&search=

Notice the hair like carbon left holding it as he carried it.
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