Sport bike for the parapalegic

[Two Smoker]

Yeah I got that bit. I was wondering if when slowing to a stop the system allowed for the fact the ground may be uneven.

Ie when the road cambers to the left can you lower the left wheel further?

Geez talk about a talent for stating the obvious while missing the point.

LOL, thanks for explaining it a bit further doesn't look like it from the pictures, unless there is a centre pivot point on the frame of the assisting wheels and that point would have to have stops to stop the bike leaning to far..... hmmmmm who knows????

[pete376403]

If the struts are worked by air cylinders (or hydraulics) and both struts are pneumatically/hydraulically linked (think; balance hose) they will both come down together, on a sloping surface when one side hits the road it will stop extending if the other side is still off the surface and has little resistance to movement. Once both sides are on the road the pressure will be the same each side and they will provide an equal amount of lift. Thats what I reckon anyway.

[Hitcher]

If the struts are worked by air cylinders (or hydraulics) and both struts are pneumatically/hydraulically linked (think; balance hose) they will both come down together, on a sloping surface when one side hits the road it will stop extending if the other side is still off the surface and has little resistance to movement. Once both sides are on the road the pressure will be the same each side and they will provide an equal amount of lift. Thats what I reckon anyway.

It would need to be a slightly more elaborate mechanism than that. The first strut down would have to lock out on contact, as would the second, otherwise they would only act as dampers to delay the inevitable toppling! This is doable with a hydraulic system. So too is having a speed-sensitive actuator that brought the undercarriage down when the speed was less than a given amount (on deceleration) and raised them again on acceleration. I am trying to figure out how best to power the hydraulic pump. This would be much easier if bikes had power steering -- then you could make use of the dumped oil from that pump to power the retractable undercarriage...

[pete376403]

Run the pump off a high torque electric motor -a starter motor would be ok. It's not like its being used that much. As far as lockout goes, once the valve controlling oil (or air) into the cylinders closed, they should hold at that point. Hydraulics definitely, air if there was enough pressure involved - like the struts that the land speed record bikes use to hold them upright until they're up to speed - they are worked by compressed air or nitrogen

[Motu]

step starting like a ten speed

Back when the single shock dirt bikes came out and young guys all rode them on the street - they thought the gun thing to do was wind the shock to the max preload (like,you need to do that if ya doin jumps eh) So the seat height of an XR500 was chest height for me - when I had to road test them that's what I'd do...put my foot on the right peg,then take off and swing the leg over.Coming back I'd dismount as I'd stop - just like any kid on a push bike.

The original topic?

[Hitcher]

Run the pump off a high torque electric motor -a starter motor would be ok. It's not like its being used that much. As far as lockout goes, once the valve controlling oil (or air) into the cylinders closed, they should hold at that point. Hydraulics definitely, air if there was enough pressure involved - like the struts that the land speed record bikes use to hold them upright until they're up to speed - they are worked by compressed air or nitrogen

After sleeping on this I reckon electric is the way to go -- use worm-gear and pressure switches.