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Author Topic: Glossary of Terms
westgate
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Post Re: Glossary of Terms
on: December 8, 2017, 21:19
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A combination of your answer and a bit of scale measuring I think that I am somewhere near, Thanks. You'll undoubtedly have more experience than me, what sort of degree of body roll might one expect on a sports car, a TVR Vixen in "fast road" trim to be precise? Is it unrealistic to expect to completely eliminate roll centre movement on a car like this without completely remaking everything!? Regards
racingaspi-
rations.co-
m
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Post Re: Glossary of Terms
on: December 8, 2017, 21:54
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5 degrees roll is a good starting point. You don’t need to eliminate roll center movement entirely - just control it so there are no wild changes. I always try and keep my roll center within a metre of the CoG, but that is by no means a benchmark. I have written a few articles on roll center movement, location and wheel frequency which may help

https://www.racingaspirations.com/roll-center-movement-kinematic/
https://www.racingaspirations.com/moment-center-for-circle-track/
https://www.racingaspirations.com/about-wheel-frequency/
classictin-
ker
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Post Re: Glossary of Terms
on: June 12, 2018, 18:52
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Hi.

When looking at report data for bump steer left I'm seeing -0.2 at -5 degrees roll (far left) and 0.6 at +5 degrees roll (far right). Does this mean I'd be experiencing 0.2 degrees of toe out off the left hard wheel and 0.6 toe in of the right hand wheel while turning right?
racingaspi-
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m
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Post Re: Glossary of Terms
on: June 13, 2018, 19:40
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You need to get your trigonometry head on to work out the angle...

https://en.wikipedia.org/wiki/Trigonometry

The value I given you is the distance of the opposite side of a right-angled triangle.

You will need to supply the distance from the kingpin to the steering arm knuckle - which will be the hypotenuse.

http://www.cleavebooks.co.uk/scol/calrtri.htm is a useful tool

a = the calculator value
c = the steering arm distance

click calculate

angle A = the steering angle
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