Hi,

I have been thinking a bout a leaning trike again, bikes as far as I can tell have no KPI and rely on a responsibly large value for caster for self centring.

what sort of value for caster would I need to apply if I have no KIP as in a leaning vehicle any significant KPI value would lead to a scrub radius that changes by a large value and my sketching this evening seam to show that the scrub radius will decrease on the loaded wheel and increase on the unloaded wheel.

having said all that I might well have got my sketcheds wrong so im of for a bit more of a think

so if im going to remove reduce KPI toa minimum what levels of caster will I need to provide a sensible amount of steering feed back?

blake

as well as castor you will need "trail"
shopping trollies have trail but no castor

are you doing this in autocad? I would

[Edited on 14/10/08 by Mr Whippy]

I have been using a combination of solid works and a string computer.

so what is a good value of trail?

hi,

Having been thinking a bit more surly having tail on a wheel will lead to the wheel turning on its pivot point during breaking.

also once the wheel is leaning as the point of contact of the tyer is now behind the upright pivot point the wheel will want to turn in to the turn more?

So at this point in time i'm thinking of a set up witch has a responsible amount of caster 8 degrees or so, a KPI of 0 so that the scrub radius remain static over the 90 of lean the tyre an a scrub radius will be around 20 mm or there about.


blake