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alevand
human power expert

USA
3541 Posts

Posted - 09/30/2019 :  10:12:39  Show Profile  Visit alevand's Homepage  Reply with Quote
The scrub would be eliminated if it were a trike and coaxial, but would still scrub as outriggers. Function with differential would be same as I-lean but with 2 pivots and linkage. You could use a straight axle and pivot, like on front of a farm tractor.

Please see the video "zero gravity bicycle"

C:
Tony Levand

Edited by - alevand on 09/30/2019 10:29:45
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Balor
recumbent guru

Russia
750 Posts

Posted - 09/30/2019 :  10:55:31  Show Profile  Reply with Quote
You mean this one?
https://www.youtube.com/watch?v=rNQdSfgJDNM

That's why you cannot use *passive* self-centering on a free-leaning trike.
Any self-centering force will also force you to lean more. Tilt damping should work.
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alevand
human power expert

USA
3541 Posts

Posted - 09/30/2019 :  12:22:46  Show Profile  Visit alevand's Homepage  Reply with Quote
Ive tried using springy outriggers, landing gear, and the bike flipped over in the driveway after going 50 feet. This was before I saw this video.

C:
Tony Levand
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Balor
recumbent guru

Russia
750 Posts

Posted - 10/07/2019 :  03:35:24  Show Profile  Reply with Quote
quote:
Originally posted by alevand

Well, he probably got fed up deleted his account again for the next 6 years because of us idiots, he's done some cool stuff. Looks like he's putting hub steering on the rear wheel for thrust vectoring..

Adleweder velomobile has had a virtual pivot in the steering for years..

C:
Tony Levand



Btw, here found a nice article that describes in detail what he wanted to accomplish (and likely did accomplish) with rear steering:

https://www.motorcyclespecs.co.za/model/yamaha/yamaha_morpho_ii.htm

Unfortunately, while it will do nicely for a track bike it will make already not very practicable (limited steering lock) bike even less practicable because it will further increase turning circle.

For a practicable bike a system that steers the rear in the same direction for a few degrees, than *reverses* rotation and steeres in other direction is much better, but hard to make in practice.

I *think* it was done mechanically on older Hondas:

https://autoweek.com/article/car-life/four-wheel-steering-demystified



I do have trouble of wrapping my mind around this arrangement however.
Delaying rear steering to +- 5 or so degrees of front wheel deflection will also work (in case of a practicable bike with opposite sense rear steering, designed to decrease turning circle).

Edited by - Balor on 10/07/2019 05:37:00
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