h a l f b a k e r yI think, therefore I am thinking.
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The yaw motion (side tilt) imparted by the driver onto the backrest is power-assistedly transferred to steering the front wheels.
Exact angle ratio (backrest:wheels) is determined as the lean required to have the upper body "upright" against the centrifugal force of the turn. (plus a less intuitive
system for parking lot speeds)
Hand-powered Tricycle
http://www.douglas-...cle/tricycle.htm#ha
Third item in list. [8th of 7, Oct 31 2020]
Countersteering
https://en.wikipedi...ics#Countersteering
Bicycle and motorcycle dynamics [8th of 7, Oct 31 2020]
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Annotation:
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Steering by leaning is Baked, but probably not WKTE. <link> |
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Suggested for deletion, not an innovation. |
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Not sure it should be deleted. First time I ever heard of it.
I see problems though, gravity works and if leaning controls steering then, unless your track is laterally level with no corners, you will constantly fight against random tilts. |
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Awww, but it's Halloween, my wonderful baking friend, 8thie. |
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You've been at the ol' metal polish again, ain't you [bliss] ? |
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// you will constantly fight against random tilts. // |
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Motorbikes steer mostly by leaning, not by turning the front wheel. In fact, at higher speeds, countersteering is equally if not more effective. |
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//Motorbikes steer mostly by leaning// |
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That's different. You lean the entire machine so gyro forces apply to the whole system. 'You' included.
This idea and the third image in your link use a leaning control 'device' to steer the whole system.
So what happens if tilt or g-forces cause you to control steering simply because you are connected to the leaning mechanism and can't control your own leaning? |
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With a motorcycle there's a tactile feel to when tilt will overcome grip. |
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1: I have seen (and used) a tilt-steered pedal-powered
catamaran. Tilt control worked OK, but of course it's a
relatively low-speed application.
2: Remember you need to have something to tilt against
(handgrips in the catamarans case) which means those
parts aren't doing much else. As per [2 fries shy of a
happy meal], and because a car doesn't lean like a
motorbike, g-forces will mean unexpected leans could
happen.
<Aside> A friend of mine (also a mechanical engineer) did
a science fair project on this very thing: the difference
between the forces & motions etc when cars & bikes turn.
</aside> |
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Stilt steering would be a better idea. You could
stand up on the stilts in the sunroof with the ends
of them threaded through the spokes on the
steering wheel. I nominate chicken little 8th to
test drive the prototype, at high speed along a cliff
edge of course. |
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//Motorbikes steer mostly by leaning, not by turning the front wheel. In fact, at higher speeds, countersteering is equally if not more effective.// |
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I won't say that you are factually wrong; but it seems that you are making an arbitrary distinction. It's a bit like: |
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A. We're directly above the centre of the earth. |
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A close analogy is turning in an aircraft. |
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Q. Does an aircraft turn mostly by banking or mostly by rudder control? |
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A. It's not a very useful distinction; a good turn involves precise coordination of both. If your aircraft has a stable design, you can turn it (badly) using the rudder alone; you can also turn it (badly) using banking alone. Making it roll _causes_ it to yaw; making it yaw _causes_ it to roll; in practice, a good pilot uses all of the controls in a coordinated way to make the 'craft behave nicely. |
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Likewise, it's possible to steer a motorbike (badly) using leaning alone or (less badly) by using the handlebar alone. Making it lean _causes_ the handlebar to turn; turning the handlebar _causes_ the bike to lean. A good rider uses body mass and the handlebar and the throttle in a coordinated way to make the bike behave nicely. |
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It could be said that motorbikes turn _entirely_ by leaning, in the sense that the accelleration vector during a stable turn lies in the plane defined by the centre of mass and the two contact patches; the horizontal component represents the centripetal force. It could also be said that motorbikes turn _entirely_ by handlebar steering, in the sense that the rest of the bike usually arrives at the same destination as the front wheel. Again, it's not a very useful distinction. |
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And technically, all steering in a bicycle or motorbike involves countersteering (of which there are two main factors). |
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If fly/ride/drive/pilot by computer wire is common place, a standardized stick of motion might be a good idea. Jane driving CBD rubbish facilitator now can pilot the docking of a failed reentry vehicle. |
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