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Rear wheel steering?

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c-m
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PostPosted: 22:49 - 13 May 2010    Post subject: Rear wheel steering? Reply with quote
Just a crazy wondering..

Were there ever any rear wheel steering motorcycles made? Would these be more stable that normal bikes with less chance of losing the front?
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Blue_SV650S
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PostPosted: 23:21 - 13 May 2010    Post subject: Reply with quote
Rear wheel steering has been around for ages ... here, this guys bike has got it!! Thumbs Up

https://www.youtube.com/watch?v=DARsTJkqBXs#t=00m50s
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Faldo
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PostPosted: 23:29 - 13 May 2010    Post subject: Reply with quote
Full RWS is useless at any speed higher than about 20 mph, hence why forklifts use it. It's only good for maneuvering in small spaces at very low speed. Think how hard steering a car is in reverse when you floor it.

4WS cars use the back wheels for slight counter steering to either aid turning circle at low speed or stability at high speed.
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Frost
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PostPosted: 23:51 - 13 May 2010    Post subject: Reply with quote
The worlds fastest car was rear wheel steered, so it is possible, but a pain in the arse on a bike and will add extra weight due to the complex mechanics required.
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Faldo
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PostPosted: 00:00 - 14 May 2010    Post subject: Reply with quote
DaFrostyOne wrote:
The worlds fastest car was rear wheel steered, so it is possible, but a pain in the arse on a bike and will add extra weight due to the complex mechanics required.


I don't think it'd be the weight or complex mechanics that'd be a pain in the arse, more the fact that it wouldn't go around corners at any kind of speed. The worlds fastest car was only designed to go in a straight line, so it's not really a possibility on a production car or bike.

*awaits people posting pics of RWS 3 wheeled vehicles*
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MarJay
But it's British!



Joined: 15 Sep 2003
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PostPosted: 08:52 - 14 May 2010    Post subject: Re: Rear wheel steering? Reply with quote
c-m wrote:
Just a crazy wondering..

Were there ever any rear wheel steering motorcycles made? Would these be more stable that normal bikes with less chance of losing the front?


No it wouldn't be more stable, it would be awful. Try riding a bicycle backwards and see.
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Wafer_Thin_Ham
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PostPosted: 09:42 - 14 May 2010    Post subject: Re: Rear wheel steering? Reply with quote
c-m wrote:


Were there ever any rear wheel steering motorcycles made? Would these be more stable that normal bikes with less chance of losing the front?


It's not the steering bit that makes it easy to lose the front. I suspect it would still be equally easy to lose the front even with a rear wheel steer bike.

Once you've initiated the turn it's the decreasing radius of the tyre(on the shoulder) that actually makes the turn rather than you "turning" the bars like you do in a car.
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GT Biker
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PostPosted: 17:13 - 15 May 2010    Post subject: Reply with quote
DaFrostyOne wrote:
The worlds fastest car was rear wheel steered, so it is possible, but a pain in the arse on a bike and will add extra weight due to the complex mechanics required.


Actualy the bugatti veyron is not rear wheel steered in which case your wrong. If your on about thrust ssc or some crap like that they aint really cars. Certanly not street legal anyway.

In any case why would rear wheel steering require anything more complicated? Every road legal car in the world for example, is rear wheel steered when reversing.
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Frost
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PostPosted: 17:29 - 15 May 2010    Post subject: Reply with quote
The worlds fastest street legal car is NOT the Bugatti Veyron, the SSC ultime aero is.

https://www.ridelust.com/wp-content/uploads/ssc_ultimate_aero.jpg

And yes i was talking about the Thrust SSC being rear wheel steered as an example of how a rear wheel steered car can remain stable at high speed. I thought citing the worlds fastest car was quite a good example Laughing

It also most certainly IS a car, 4 wheels, steering wheel, seats, car.

Rear wheel steering on a bike is more complicated as complex linkages would be required to convert handle bar movement into rear wheel angle change over the length of the bike. This angle change would possibly need to be scaled proportionally to keep the bike controllable.

It's certainly doable, but provides no real advantage.
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MarJay
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PostPosted: 17:41 - 15 May 2010    Post subject: Reply with quote
https://www.thrustssc.com/thrustssc/Engineering/rearster.html

With six degrees of steering movement, I wouldn't want to do a 3 point turn in the Thrust SSC.
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Frost
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PostPosted: 18:07 - 15 May 2010    Post subject: Reply with quote
https://www.bluebird-electric.net/bluebird_images/trust_ssc_rear_wheel_steering_mini_rig.jpg
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N cee thirty This post is not being displayed because the poster is banned. Unhide this post / all posts.

Frost
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PostPosted: 22:13 - 15 May 2010    Post subject: Reply with quote
https://www.youtube.com/watch?v=DhNm0FOIiG0
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GT Biker
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PostPosted: 23:51 - 15 May 2010    Post subject: Reply with quote
DaFrostyOne wrote:
The worlds fastest street legal car is NOT the Bugatti Veyron, the SSC ultime aero is.

https://www.ridelust.com/wp-content/uploads/ssc_ultimate_aero.jpg

And yes i was talking about the Thrust SSC being rear wheel steered as an example of how a rear wheel steered car can remain stable at high speed. I thought citing the worlds fastest car was quite a good example Laughing

It also most certainly IS a car, 4 wheels, steering wheel, seats, car.

Rear wheel steering on a bike is more complicated as complex linkages would be required to convert handle bar movement into rear wheel angle change over the length of the bike. This angle change would possibly need to be scaled proportionally to keep the bike controllable.

It's certainly doable, but provides no real advantage.


I heard the SSC ultime aero was faster than a veyron but didnt think it was officialy tested. In anycase you cannot look at the thrust ssc and call it a car lol!! Thats a bit like calling James May "The Stig".

I agree with you on the bike thing though. How would they get the rear wheel to steer if it were connected to a drive chain. It would mean sending drive to the front wheel and cock up everything we know about riding bikes. It would be the most Clarkson idea "in the world".
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Wafer_Thin_Ham
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PostPosted: 09:04 - 16 May 2010    Post subject: Reply with quote
GT Biker wrote:


I heard the SSC ultime aero was faster than a veyron but didnt think it was officialy tested. In anycase you cannot look at the thrust ssc and call it a car lol!! Thats a bit like calling James May "The Stig".

.


You can look at Thrust SSC as a car since SSC stands for Super Sonic CAR.

Laughing
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Faldo
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PostPosted: 09:31 - 16 May 2010    Post subject: Reply with quote
I too thought of Thrust SSC when somebody mentioned the worlds fastest car.

The Ultimate Aero is front steered anyway, as you can see below:

https://joshinthecity.files.wordpress.com/2007/03/ssc.jpg
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Old Thread Alert!

The last post was made 16 years, 42 days ago. Instead of replying here, would creating a new thread be more useful?
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