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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="ET43" data-source="post: 16573" data-attributes="member: 62"><p>There are a few references to short top links in Fourty Year On. I cannot see that a short link in the solo position would give less trail than Rapcon's last measurement. I would hazard a guess and say that the short link/solo position would give a trail of around 1.75", assuming that a 20 inch wheel was fitted. Smaller wheels steepen the steering head angle and reduce the trail. The more the trail is reduced, the more likely it is that one will require a hydraulic damper especially adapted for sidecar use as the self centering action of long trail is reduced.. Solo dampers are soon destroyed if your outfit has the shakes!!</p><p>I was commisioned to ride the pre prototype Wasp leading link outfit in 1975. It had around 1/4" of trail and if one passed wind, you changed direction. It was that bad. Wasp eventually arrived at a figure of 3/4" which all their forks use today. However, I must stress that this is a L/L fork where the pivot for the fork is at least 1" below the wheel spindle, similar to what the Earle Fork B.M.Ws' use. I am not qualified to say what the effect of using the last suggested arrangement would be even assuming that one has an outfit which fits all normal parameters for sidecar wheel lead, width of the outfit and toe in respecting the type and weight of chair fitted, but I guess that it would be lively to say the least! It helps the handling if the tyre is run at 20psi so as to absorb some of the road shocks, as a hard tyre will impart some wobble to the handlebars as it rides over bumps, etc.</p><p>Good Luck, ET43</p></blockquote><p></p>
[QUOTE="ET43, post: 16573, member: 62"] There are a few references to short top links in Fourty Year On. I cannot see that a short link in the solo position would give less trail than Rapcon's last measurement. I would hazard a guess and say that the short link/solo position would give a trail of around 1.75", assuming that a 20 inch wheel was fitted. Smaller wheels steepen the steering head angle and reduce the trail. The more the trail is reduced, the more likely it is that one will require a hydraulic damper especially adapted for sidecar use as the self centering action of long trail is reduced.. Solo dampers are soon destroyed if your outfit has the shakes!! I was commisioned to ride the pre prototype Wasp leading link outfit in 1975. It had around 1/4" of trail and if one passed wind, you changed direction. It was that bad. Wasp eventually arrived at a figure of 3/4" which all their forks use today. However, I must stress that this is a L/L fork where the pivot for the fork is at least 1" below the wheel spindle, similar to what the Earle Fork B.M.Ws' use. I am not qualified to say what the effect of using the last suggested arrangement would be even assuming that one has an outfit which fits all normal parameters for sidecar wheel lead, width of the outfit and toe in respecting the type and weight of chair fitted, but I guess that it would be lively to say the least! It helps the handling if the tyre is run at 20psi so as to absorb some of the road shocks, as a hard tyre will impart some wobble to the handlebars as it rides over bumps, etc. Good Luck, ET43 [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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