Timeline for Why caster angle causes wheels to self-center?
Current License: CC BY-SA 4.0
12 events
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| Dec 19, 2021 at 16:26 | comment | added | NMech | Despite that they are not stable positive angles are used in motorsports because they provide a good feedback. IE turning away requires effort and the driver can react better. The negative caster angle is almost never used in motir sport as because of this. | |
| Dec 19, 2021 at 16:19 | comment | added | NMech | That is a very good question. I would think that the rwd is the same as a office chair wheel meaning that it would be stable for negative (?) Caster angles and offsets( compared to the fwd which should be stable for positive caster angles). | |
| Dec 19, 2021 at 16:03 | comment | added | dotancohen | @NMech: RWD cars are not propelled by the wheels used to steer. Do changes in caster affect RWD and FWD cars differently? | |
| Dec 19, 2021 at 10:19 | history | edited | NMech | CC BY-SA 4.0 |
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| Dec 19, 2021 at 10:19 | comment | added | NMech | The idea is that you need to project the castor point, and apply the friction force on the contact patch. Then you need to calculate the moment with respect of the castor point. | |
| Dec 19, 2021 at 10:00 | comment | added | NMech | @supertonsky (I am afraid I am at home with my kid in quarantine and I've got my hands a bit tied so I won't be able to produce any nice graphs). However you are in the right track, you need to undertstand that the force that produces the turning of the wheel is the friction from the ground (which is opposite to the input force). This is also the big difference from the wheel of a car, because in the case of the car the friction is responsible for propelling the car forward. | |
| Dec 19, 2021 at 1:38 | comment | added | supertonsky | Thanks for explicitly stating that the two are actually two different concepts. The way I understood the video, the guy seems to conflate the two concepts as if they are the same thing. That confused me. Caster trail at the wheel is easier to understand and intuitive but the caster angle isn't. | |
| Dec 18, 2021 at 20:51 | comment | added | Solar Mike | @Transistor just drop the centreline of the axle down to the baseline, or measure to the centre of the wheels contact point. | |
| Dec 18, 2021 at 16:30 | history | edited | NMech | CC BY-SA 4.0 |
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| Dec 18, 2021 at 16:10 | comment | added | Transistor | In the middle figure of the three wheels in the question (and my answer) there would be no offset as you have dimensioned the picture. The measurement should be to the ground contact point. | |
| Dec 18, 2021 at 15:44 | history | edited | NMech | CC BY-SA 4.0 |
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| Dec 18, 2021 at 15:38 | history | answered | NMech | CC BY-SA 4.0 |