Folding Bikes - Page 5 of googled results for R20...

http://www.outsideconnection.com/gallant/hpv/mred/

Cool but I bet that thing pours smoke right in your face when it's running.

I would hope so!

Wow! I want for forays down to the chippie on lazy nights...

I'm gobsmacked by the fact that it has a derailleur up front... and... it's front wheel engine drive... and... rear wheel pedal drive... equals = 2 wheel drive!!

I cant make up my mind if it's foolishness or sheer genius?!?? haha :)

now the $10 million dollar question....





does it still fold?

xD

Genius.

Most motorized bicycles do not have derailled gearing involved in the final drive; how well does this work? How do you coordinate the shifting gently?

I doubt there's a smoke issue at any speed other than stopped. The French solex was a similar system, but I think, as with other engine drives, it was single drive speed to the wheel.

But wait... There's More!
Hit that website at the top of the post Then go to this guy's home page.

Most motorized bicycles do not have derailled gearing involved in the final drive; how well does this work? How do you coordinate the shifting gently?

Just guessing... I'd say it would upshift and downshift at any preferred time. I'm assuming the cassette (looks like a 2 or 3 speed) of the front wheel has a free-wheel or ratchet barrel, so engine braking forces would not come into play. I have never seen a derailleur in the front wheel - genius!

^ and oh, it just keeps coming... motorized rear wheel drive with derailleur - genius again! :lol:

Obviously, there would have to be a centrifugal clutch in there somewhere... :)

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I believe that the centrifugal clutch is integrated into the motor...

What sort of engine is this? I`we got an old Husquarna chainsaw lying around..

^ There we go!! It was only a mater of time for the inevitable... :)

I was thinking of my 14V rechargeable cordless electric drill... I do believe it has a clutch!! :thumb:

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Now all he needs to do is combine the front section of the red one with the rear of the green for an AWD version. I wonder if that's still congestion-charge exempt? :)

But wait... There's More!
Hit that website at the top of the post Then go to this guy's home page.



Jeez ! Its a proper brain teaser to work out what's going on there with all the chains.

That would send me to sleep a lot quicker than working out the gear change operations inside a SA three speed or counting sheep.

Try and work it out. I can't get it yet.

Unless the pedals rotate all the time there would have to be three chains and a freewheel in the apex of that chain guard under the seat. One chain driving the under seat freewheel shaft under the seat, one chain not freewheeling, going to the motor and connecting it to the shaft under the seat, and a drive chain down to the wheel. Can't see how it would work otherwise, but it seems over complicated so maybe I'm wrong.

Made by a retired engineer I bet, plenty of time and a wealth of experience so he would like to be creative.

Ah ha - all is revealed by going to the page where he shows how it was done. I was right - three chains, but I hadn't factored in the gear box for reducing the ratio. What a lovely project.

Thing is, here it would need to be registered as a motor cycle with all the clart of having it tested, paying Vehicle Excise duty, compulsory insurance, number plates and all the rest. F'ing government interference!!!!

What a great idea. I'd be as proud as anything if I'd invented and built that.

ROFLMAO



This is JUST the thing. We should all take up riding a faired recumbents like this one.....






These could really catch on with a little more attention to styling.

:)


Here's the inventor posing elegantly on his 'Deliverance Bent' before he made the lush bodywork.

Duelling Banjos anyone? Dugadank dank dank dank dank dank dank.

ROFLMAO

My my - what you can find on the Internet when you've nothing better to do.

Jeez ! Its a proper brain teaser to work out what's going on there with all the chains.... Ah ha - all is revealed by going to the page where he shows how it was done. I was right - three chains, but I hadn't factored in the gear box for reducing the ratio. What a lovely project...

I would imagine that the chain from the cranks/chainring would be looped around a sprocket WITH a freewheel - so that it would prevent the cranks from spinning forward when the motor is running faster than the pedaling.

I would also guess that the chain coming from the engine is looped around a sprocket WITH the centrifugal clutch.

Either sprocket is capable of driving the spindle that they both share (without intervention) depending on which is dominant. The spindle of course has a sprocket that drives the chain that is looped around the rear wheel cassette/derailleur - applicable anytime, regardless of who or what is driving it. Genius... sheer genius...

.

I would imagine that the chain from the cranks/chainring would be looped around a sprocket WITH a freewheel - so that it would prevent the cranks from spinning forward when the motor is running faster than the pedaling.

I would also guess that the chain coming from the engine is looped around a sprocket WITH the centrifugal clutch.

Either sprocket is capable of driving the spindle that they both share (without intervention) depending on which is dominant. The spindle of course has a sprocket that drives the chain that is looped around the rear wheel cassette/derailleur - applicable anytime, regardless of who or what is driving it. Genius... sheer genius...

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It is clever. The spindle you and I were both struggling to name is known as a 'Jack Shaft' I think. After I wrote that post I found lots of details on the guy's site. Your description sums it up I think - it is sheer genius. Some of the videos on the site show that it is quite a noisy little motor though. Nothing like as peaceful or as sleek as a nice pedal powered bicycle with a sweaty rider puffing along on it.