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<blockquote data-quote="timetraveller" data-source="post: 73728" data-attributes="member: 456"><p><em>Does the Shadow have " concentrics" for the Girdraulics?</em></p><p></p><p>Yes, both bikes have the John Emmanuel mod. but the fact that a 'concentric' is used is not the important part of this. The pivot for the rear of the lower link is moved totally to a different centre which means that the springs are both more upright and the space for them is shorter. I designed in a 'concentric' because I could not imagine any sidecar users going for this modification. On the photographs no. 15 is the Patrick Walker bike, without a steering damper, and no. 47 is the Robert Lusk bike. I have more connection with the latter but both have some of my bits on them. I don't know how Patrick got on but on the Friday his gear change was very stiff and there was not a good time to take too much of it apart. I have emailed him with some suggestions. The Robert Lusk bike finished eighth on Saturday in torrential rain and feed back is that there is enough power. However, on the Sunday the bike was pulled in by the second rider only two laps from the end with oil spray hitting his visor coming out of the oil filler neck. We do not know what the problem is yet as this bike, with a twin start oil pump, has not given this problem before and has a deflector inside the filler cap to try to prevent spray and splash at high revs. It will be investigated in a week or twos time.</p><p></p><p>Please note that the rear end of both bikes are jacked up significantly to both increase the head angle and to give more clearance for the exhaust pipes.</p><p></p><p>Greg is correct that with the Thornton damper and 3" of pre-load on the 30 lbs/inch springs the forks are being pushed upwards. However, they do go down when the rider sits on the bike. We need to play around with it a bit more and I think that we will end up with less pre-load. All this is so that we can come up with the best compromise for those who would like to use this mod on the road and get the best comfort that they can. As a starter one can just use the out springs from a normal 'C' pair but the 36lbs/inch springs, as used by Chrislaun, are certainly better. It is only a matter of trying to optimise a system which will suit most people. The fact that one can race without a steering damper shows how much the handling is improved. Just have to try to optimise the comfort now.</p></blockquote><p></p>
[QUOTE="timetraveller, post: 73728, member: 456"] [I]Does the Shadow have " concentrics" for the Girdraulics?[/I] Yes, both bikes have the John Emmanuel mod. but the fact that a 'concentric' is used is not the important part of this. The pivot for the rear of the lower link is moved totally to a different centre which means that the springs are both more upright and the space for them is shorter. I designed in a 'concentric' because I could not imagine any sidecar users going for this modification. On the photographs no. 15 is the Patrick Walker bike, without a steering damper, and no. 47 is the Robert Lusk bike. I have more connection with the latter but both have some of my bits on them. I don't know how Patrick got on but on the Friday his gear change was very stiff and there was not a good time to take too much of it apart. I have emailed him with some suggestions. The Robert Lusk bike finished eighth on Saturday in torrential rain and feed back is that there is enough power. However, on the Sunday the bike was pulled in by the second rider only two laps from the end with oil spray hitting his visor coming out of the oil filler neck. We do not know what the problem is yet as this bike, with a twin start oil pump, has not given this problem before and has a deflector inside the filler cap to try to prevent spray and splash at high revs. It will be investigated in a week or twos time. Please note that the rear end of both bikes are jacked up significantly to both increase the head angle and to give more clearance for the exhaust pipes. Greg is correct that with the Thornton damper and 3" of pre-load on the 30 lbs/inch springs the forks are being pushed upwards. However, they do go down when the rider sits on the bike. We need to play around with it a bit more and I think that we will end up with less pre-load. All this is so that we can come up with the best compromise for those who would like to use this mod on the road and get the best comfort that they can. As a starter one can just use the out springs from a normal 'C' pair but the 36lbs/inch springs, as used by Chrislaun, are certainly better. It is only a matter of trying to optimise a system which will suit most people. The fact that one can race without a steering damper shows how much the handling is improved. Just have to try to optimise the comfort now. [/QUOTE]
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