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Author Topic: Reverse  (Read 192 times)

Tinworm

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Reverse
« on: 06 May 2022, 06:39:07 pm »
Does anyone have any thoughts about how to get a cyclekart to reverse? My long wheelbase means that I won't be able to operate my back wheels with my arms (and anyway, if I could, that action is tricky for me, following a flying accident, though physio has improved it).

I wondered, for instance about using an electric motor

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Ian F

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Re: Reverse
« Reply #1 on: 06 May 2022, 06:57:29 pm »
A drawback with an electric motor would be the need for a battery and the weight of the total package.

Would it be possible to have a bike freewheel and chain connected to a dummy handbrake on the side of the CK?  Then just go backwards and forwards on the lever to reverse?

Tinworm

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Re: Reverse
« Reply #2 on: 06 May 2022, 07:01:10 pm »
A drawback with an electric motor would be the need for a battery and the weight of the total package.

Would it be possible to have a bike freewheel and chain connected to a dummy handbrake on the side of the CK?  Then just go backwards and forwards on the lever to reverse?

Great minds think alike! I wondered about that, particularly as my car has two levers anyway. I wonder how that would be achieved, exactly? Do you know? Kind of like a ratchet?

Ian F

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Re: Reverse
« Reply #3 on: 06 May 2022, 07:07:43 pm »
Yeah, a ratchet is a good analogy.  A simple rear hub off a pushbike and a bike chain would do the trick.  It would freewheel when the engine is driving the kart and engage for reverse when your pulling on the lever.

Tinworm

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Re: Reverse
« Reply #4 on: 06 May 2022, 07:27:31 pm »
Yeah, a ratchet is a good analogy.  A simple rear hub off a pushbike and a bike chain would do the trick.  It would freewheel when the engine is driving the kart and engage for reverse when your pulling on the lever.

I like this a lot. Would freewheeling at 40mph be ok for the bearings? The chain, would it be non-continuous, with a spring at one end, drive cog at the other? so you drive back, freewheel forward, drive back, freewheel forward etc, working the lever?

I really fancy this. Seems simple-ish

Seven racer

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Re: Reverse
« Reply #5 on: 06 May 2022, 07:31:53 pm »
I'm  aiming to use a reverse gearbox, not only does it provide reverse, but it takes the drive down 1.3 to 1, so I should be able to use a smaller rear gear wheel.

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It's a bit of an extravagance,  but I'm invoking the 'fun' rule.

Peter

Ian F

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Re: Reverse
« Reply #6 on: 06 May 2022, 07:33:40 pm »
It would just be like a bike, drive sprocket at the pivot of the dummy handbrake lever driving a driven sprocket somewhere on the axle and a small bike chain.  I guess the bike hub and sprocket could be at either the driver or driven sprocket. My lad often hits 40mph on some downhill runs where he lives in the Alps.

Ian F

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Re: Reverse
« Reply #7 on: 06 May 2022, 07:36:20 pm »
Wow Peter, thats a very impressive set-up youve got  8)

Jimr1999

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Re: Reverse
« Reply #8 on: 06 May 2022, 07:46:30 pm »
Probably just the time of the day, or perhaps just my time of life but struggling with the operation of the ratchetting freewheel idea as to how it would work against the normal direction of the wheel  ???
I was thinking more on the lines of this without the constant engagement if I did one on mine...
https://www.youtube.com/watch?v=_eWK4RdjCwc
... You can lead a horse to water, but a pencil must be lead.

Seven racer

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Re: Reverse
« Reply #9 on: 06 May 2022, 08:45:34 pm »
Wow Peter, thats a very impressive set-up youve got  8)

I think Gemini sell the reverse boxes, but I got mine from Ebay. If you are interested it's worth putting it on a watch list, or in your basket, and leaving it alone. You quite often get a follow up offer of a lower price. I think I paid less than £120 for mine.
 This is the sort of thing

https://www.ebay.co.uk/itm/394018452556?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=kg2eh7jes96&sssrc=2349624&ssuid=n3Xl8mAaSmy&var=&widget_ver=artemis&media=COPY

Peter

Tinworm

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Re: Reverse
« Reply #10 on: 06 May 2022, 08:55:41 pm »
It would just be like a bike, drive sprocket at the pivot of the dummy handbrake lever driving a driven sprocket somewhere on the axle and a small bike chain.  I guess the bike hub and sprocket could be at either the driver or driven sprocket. My lad often hits 40mph on some downhill runs where he lives in the Alps.

ok, cool. I have been looking at lever driven wheelchairs

Tinworm

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Re: Reverse
« Reply #11 on: 06 May 2022, 09:24:19 pm »
https://www.jackdrivewheelchair.com/

Not the tank driving idea, but the drive chain

Jimr1999

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Re: Reverse
« Reply #12 on: 06 May 2022, 09:52:48 pm »
@ Tinworm.
I get how the freewheel would propel the CK backwards, what I don't get is how you would disengage it when the CK is driven forwards.
If you push a bike backwards the pedals turn backwards with it as the freehub pawls lock on

How do you intend to get around this? If you have solved it, it would be a great idea.
« Last Edit: 06 May 2022, 09:54:24 pm by Jimr1999 »
... You can lead a horse to water, but a pencil must be lead.

Tinworm

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Re: Reverse
« Reply #13 on: 06 May 2022, 09:58:21 pm »
@ Tinworm.
I get how the freewheel would propel the CK backwards, what I don't get is how you would disengage it when the CK is driven forwards.
If you push a bike backwards the pedals turn backwards with it as the freehub pawls lock on

How do you intend to get around this? If you have solved it, it would be a great idea.

Have i got this right? I was thinking that the reverse would freewheel when the car is driving forward. This is the opposite of what happens on a bicycle. In drive, the car goes backwards. In freewheel the lever is stationary...just as your pedals can be held, without the cranks turning, when coasting.

Jimr1999

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Re: Reverse
« Reply #14 on: 06 May 2022, 10:01:52 pm »
If the reverse freewheels when the CK is moving forwards, then trying to move it in reverse would not do anything. If you free wheel on a bike and reverse pedal nothing happens
... You can lead a horse to water, but a pencil must be lead.