Discussion
It's actually used more in aviation and relates to the tendency of an aircraft to swing from left to right about it's vertical axis. Nodding up and down (front to back) is referred to as "pitch" and lifting up and down from side to side is known as "roll".
Edited by Eric Mc on Tuesday 5th January 15:23
Eric Mc said:
It's actually used more in aviation and relates to the tendency of an aircraft to swing from left to right about it's vertical axis. Nodding up and down (front to back) is referred to as "pitch" and lifting up and down from side to side is known as "roll".
Well don that man, beat me to it...........again. Happy New Year Eric.Edited by Eric Mc on Tuesday 5th January 15:23
Galileo said:
Oh dear. That lot beats my explanation of oversteer or understeer with regard to the direction of travel (but at least I didn't need to use an aircraft in the motorsport forum 
)
Eta why isn't the wink smilie working?
The "wink" is probably freezing its balls off same as I am sitting in this cold office pounding the keyboard. A wink from me )Eta why isn't the wink smilie working?
Edited by Galileo on Tuesday 5th January 16:15
noted you have two )), thats the real reason.Edited by Vipers on Tuesday 5th January 16:32
jagracer said:
entropy said:
So is yaw any different to oversteer?
Yes although I've never heard of yaw being used in relation to a car.Oversteer is a different thing from yaw, although it can be an example of it.
Yaw is any time that the car is moving forward and the direction of travel is different from the longitudinal axis of the car.
Normally this will be if the car is turning (at all).
Oversteer is when the slip angles of the rear tyres are greater than the slip angles of the front tyres. Understeer obviously is the inverse, but the car is still rotating, so that too is yaw.
On the other hand, it is possible for a car to slide in a straight line, but with opposite lock on the front wheels - in oversteer. In this rare case, the car would be in yaw, although the direction of travel would be straight ahead.
The later spec Mitsubishi Lancer EVO's have active yaw, with a hydraulically operated rear limited slip diff controlling the amount of yaw by altering torque transfer to each rear wheel independantly.
My own Impreza STi has G sensors, steering wheel position sensors, yaw sensors etc that are used to feed into a centre diff controller, that is then used to actively control the amount of centre diff preload and the torque split ratio for the front/rear diff inputs using an electromagnetically controlled geared and plated diff, it's a clever little unit. Using that you can actively control the yaw of the car, once used to how it responds you can take corners at very high speed with a lovely four wheel drift, it's pretty clever stuff.
The older generation WRC cars used to have a more complex system that had active diffs at the front, centre and rear and used a stack of G and yaw sensors to feed a control system. These fully active systems were banned a few years ago, so they now have a similar setup to my road car using just the centre diff actively.
Prodrive came up with a system based around the full blown WRC setup, but designed for road car applications, this was a step further than what is on the current WRC and my car, with the diffs working in a way to try and always drive the car in the direction the steering was pointing, so opposite lock driving wasn't the name of the game, they fitted that to the Prodrive P2 prototype that Clarkson tested where he threw chunks up after doing concentric circles.
My own Impreza STi has G sensors, steering wheel position sensors, yaw sensors etc that are used to feed into a centre diff controller, that is then used to actively control the amount of centre diff preload and the torque split ratio for the front/rear diff inputs using an electromagnetically controlled geared and plated diff, it's a clever little unit. Using that you can actively control the yaw of the car, once used to how it responds you can take corners at very high speed with a lovely four wheel drift, it's pretty clever stuff.
The older generation WRC cars used to have a more complex system that had active diffs at the front, centre and rear and used a stack of G and yaw sensors to feed a control system. These fully active systems were banned a few years ago, so they now have a similar setup to my road car using just the centre diff actively.
Prodrive came up with a system based around the full blown WRC setup, but designed for road car applications, this was a step further than what is on the current WRC and my car, with the diffs working in a way to try and always drive the car in the direction the steering was pointing, so opposite lock driving wasn't the name of the game, they fitted that to the Prodrive P2 prototype that Clarkson tested where he threw chunks up after doing concentric circles.
Not that I know all that much about oversteer and understeer, but I can only find references to "yaw" to ships, planes, and rockets, is it correct to use it to a car, does a car actually "Yaw"?
I understand they can oversteer, and understeer, but yaw? we don't say a ship is understeering, or a plane oversteering?
I understand they can oversteer, and understeer, but yaw? we don't say a ship is understeering, or a plane oversteering?
Vipers said:
Not that I know all that much about oversteer and understeer, but I can only find references to "yaw" to ships, planes, and rockets, is it correct to use it to a car, does a car actually "Yaw"?
I understand they can oversteer, and understeer, but yaw? we don't say a ship is understeering, or a plane oversteering?
Sideslip?I understand they can oversteer, and understeer, but yaw? we don't say a ship is understeering, or a plane oversteering?
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