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  #1  
Old 01-11-2004, 07:56 AM
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svxxx26 svxxx26 is offline
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Question Moving car ramp???

This has bugged the crap out of me for years. I've seen it in action movies every so often and now it's on the latest Chevy commercial - where you have a flatbed truck or car carrier rolling down the highway at high speed with a ramp hanging off the back of it almost touching the road. Then someone comes up and drives a car onto the truck. I know it looks cool and all but is it really possible to do it that smoothly? I mean, you have wheels rotating at highway speeds hitting a ramp that in relative terms is unmoving. Not only that, but in the case of an AWD vehicle - would the sudden huge change between the front and rear wheels as the car mounted the ramp cause some freaky things to occur to the drivetrain?

Just wondering
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  #2  
Old 01-11-2004, 08:46 AM
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I believe the center diff would get fragged in an instant.
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  #3  
Old 01-11-2004, 08:52 AM
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..i think ANYTHING would be possible in a new 'vette

drooooooool

-adam
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  #4  
Old 01-11-2004, 08:56 AM
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Hmmm...good question...let me think. It would cause a problem with AWD vehicle as you surmised.

A regular vehicle (RWD) would be simple to do since as you drive onto it you are pushing the front end on without varying the speed of the drive wheels. As soon as you hit the ramp you could just let off the clutch and coast up the ramp (if you had enough acceleration in relation to the moving ramp) then shift into first and pull up[ the ramp as if starting on a hill. Or you could just hit the brakes without hardly a lurch as you will be shedding off almost no speed except for the rotational force of the wheels themselves.

A FWD vehicle would be a bit trickier to do smoothly and would take a skillfull driver to pull off nicely. You'd have to hit the ramp with a little speed in relation to the ramp and let off the clutch just as you hit it, letting the momentum carry you up the ramp long enough for you to shift into first, allow the revs to bleed off, then simply drive up the ramp in first as if you were starting on a hill.

I think it could be done nicely on a RWD or FWD vehicle. An AWD would have it's center clutch reeked havoc upon due to the rotational speed differences with the axles.

The thing to remember is that the speed differential is not really all as great as your subconcious tells you it is. It's not like doing 60mph then having to stop instanly or shoot off the front of the car carrier. The car and moving ramp are moving at nearly the same speed so there is no real shock of speed differential when you hit the ramp. The only thing that has to stop quickly is the rotational momentum of the wheels and since they weigh considerably less than the overall mass of the car itself, you would barely feel it's effects.

Sure would love to get a chance to try it out one day...With someone else's car of course.

-Johnny (Fast and Irritable)
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Last edited by CigarJohnny; 01-11-2004 at 09:09 AM.
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  #5  
Old 01-11-2004, 09:10 AM
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Quote:
Originally posted by alacrity024
..i think ANYTHING would be possible in a new 'vette

drooooooool

-adam
LOL!
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Pearl '92 LS-L 179K (Historic 1st 5-speed SVX)
Mods: 5-speed, 4.11's, Group-N motor mounts, dual Magnaflows, cone air filter, Kenwood MP-228 CD/Receiver, white-faced gauges, '97 grill, custom window tinting.

Ebony Mica '92 LS 80K Oct 2002 - Dec 2004: Victim of theft. She served me well.

You can tell the lack of craftsmanship by the wrinkles in the duct tape.
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Old 01-11-2004, 09:37 AM
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I saw one of those 'How-it-was-Done' programmes about the Italian Job. (Original.)

The out-takes were shown and it was filmed for real, not faked. It just took a number of attempts and a few soiled pants.

Being minis and FWD, it was just as described by Johnny.
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Old 01-12-2004, 10:20 AM
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