Wheels in air dont rotate : Why ? - Page 2 - Team-BHP

16v100bhp · 19th April 2007, 19:17

Quote:

Originally Posted by SLK

If differential was the answer.. the wheel in air is the only one that is supposed to move...

I say its just the momentum of the car... they pick up speed... and while doing the stunt don't accelerate at all... just let it roll.

Otherwise if the wheels in air are completely stopped... they might have some kind of a single sided brake!

If you jack up one side and slowly release the power then the wheels in the air will be the ones which are moving, no matter how much you accelerate after that...

As you said the initial momentum should be what keeps the car running here...

Not sure of any special setup though....

Sparkie · 19th April 2007, 20:16

Probably its a car thats specially kitted out for only rotating the left wheel! On a more serious note, when he is on 2 wheels, even very light brake inputs(which the driver might use to control the car in that situation) would be enough to stop the wheels in the air because they would not have much inertia as the load of the vehicle is not on them.

Did you see such a video on the net somewhere? In which case, could you provide a link? Cheers.

sbasak · 19th April 2007, 20:47

Quote:

wrong, the torsen doesnt work when one of the wheels is in the air.

The work around is explained here - see the "Hummer" part on right hand side towards the bottom of the page.
Howstuffworks "How Differentials Work"

Rehaan · 20th April 2007, 00:32

Worrisomebear,

It would help if you posted the video you were talking about...

Quote:

Originally Posted by nitrous

Differential lock is one probable reason.

Nitrous, i think if the diff lock is engaged BOTH wheels will ALWAYS rotate at the same speed, regardless...

Quote:

Originally Posted by headers

camera trick is the answer.

I will agree with this...it might have also been a bad quality video at night and its hard to see.

Also, if the front wheel is not driven, it will freewheel itself to a stop and this will most probably be the only wheel that is not rotating.

eg. @85seconds in this video

cya
R

vabs78 · 20th April 2007, 09:11

@worrisomebear : which car was that?

I think AWD systems can cause this. they supply power to the wheel that has traction.

gbpscars · 20th April 2007, 10:42

Quote:

Originally Posted by vabs78

I think AWD systems can cause this. they supply power to the wheel that has traction.

This is the closest explanation and quite apt too. But any techies to explain if the wheel without traction loses power completely?

Technocrat · 20th April 2007, 13:04

I did a serach on You tube for such videos & here the list

YouTube - Broadcast Yourself.

Check out this one 16 cars on two wheels

YouTube - Most Cars On Two Wheels

Not much is vible of the tire in sky but at exactly 3.05 secs you can see the stopped wheel of a white car(a renault I think)

I dont think there is any camera trick since its a Guiness record attempt

The wheel I belive are moving in this vdo

YouTube - Russ Swift Performing Two Wheels Stunt

v1p3r · 21st April 2007, 02:01

Quote:

Originally Posted by gbpscars

This is the closest explanation and quite apt too. But any techies to explain if the wheel without traction loses power completely?

I said that! LSD! Any wheel with traction gets all the torque. Wheel in air = zero traction = zero torque supplied!

Jomz · 21st April 2007, 10:19

Quote:

Originally Posted by v1p3r

I said that! LSD! Any wheel with traction gets all the torque. Wheel in air = zero traction = zero torque supplied!

In [ applications, a limited slip differential (LSD) is a modified or derived type of gear arrangement that allows for some difference in rotational ] of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an , such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity

this is from Wikipedia... It seems that LSD does not allow to increse the speed difference beyond a set limit.. so it means.. Both wheels will spin.... right???

IMHO it is possible if the driveshaft to one wheel was disengaged and the differential locked... Torque steer balanced by Steering inputs..

Or driving after having LSD-Lysergic acid diethylamide - One psychedelic drug..

20th April 2007, 09:11	#20 (permalink)
vabs78 BHPian Join Date: Mar 2007 Location: Pune, India Posts: 459 View My Garage	@worrisomebear : which car was that? I think AWD systems can cause this. they supply power to the wheel that has traction. __________________ If everything seems under control, you are not going fast enough!

20th April 2007, 13:04	#22 (permalink)
Technocrat Team-BHP Moderator Join Date: Feb 2004 Location: Pune Posts: 3,689 View My Garage	I did a serach on You tube for such videos & here the list YouTube - Broadcast Yourself. Check out this one 16 cars on two wheels YouTube - Most Cars On Two Wheels Not much is vible of the tire in sky but at exactly 3.05 secs you can see the stopped wheel of a white car(a renault I think) I dont think there is any camera trick since its a Guiness record attempt The wheel I belive are moving in this vdo YouTube - Russ Swift Performing Two Wheels Stunt __________________ 180, 225, 150, ??? -> 159? Last edited by Technocrat : 20th April 2007 at 13:06.

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19th April 2007, 20:16	#17 (permalink)
Sparkie BHPian Join Date: Apr 2007 Location: Chennai-not at home now Posts: 95	Probably its a car thats specially kitted out for only rotating the left wheel! On a more serious note, when he is on 2 wheels, even very light brake inputs(which the driver might use to control the car in that situation) would be enough to stop the wheels in the air because they would not have much inertia as the load of the vehicle is not on them. Did you see such a video on the net somewhere? In which case, could you provide a link? Cheers.