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The Passenger rides on a rigid frame
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<blockquote data-quote="Monkeypants" data-source="post: 42641" data-attributes="member: 2708"><p>It would appear that Eddie Stevens never rode pillion on a Vincent!</p><p>The "A"drawing provided by A-BC at the top of the second page of this thread looks to be correct. It shows the rear of the seat moving upwards as the suspension is compressed.</p><p></p><p>on edit- I've just reread that section of "Know Thy Beast" and I don't see where he is stating that the rear of the seat goes down.</p><p>Here is the excerpt:</p><p>"The makers quite correctly pointed out that the addition of the passenger's weight has only a minor effect on the main springs and that consequently, there is no need to change springs to accomodate varying weights of crew, within limits. But the fact is that the seat mounting system is so designed that 3"of movement in the rear frame(ie the wheel) imparts 11/2" movement to the seat at the extreme rear end. In other words, the passengers rear end, poised on the thinnest part of the seat squab, is only half sprung. No wonder some of them complain.....Some cries of anguish must have reached the factory for the powers that were eventually reacted by fitting a fully sprung seat on SeriesD models."</p><p></p><p>The only thing I would disagree with in the statement above is the mention that the seat at rear is "half sprung". This seems to be a common misconception tied to the fact that there is a mechanical 2 to1 ratio of movement between the rear axle and the rear of the seat. This is not in any way the same as having the seat rear riding on suspension, partially or otherwise.The quote from the manufacturers says it all " the passenger's weight has only a minor effect on the main spring"</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 42641, member: 2708"] It would appear that Eddie Stevens never rode pillion on a Vincent! The "A"drawing provided by A-BC at the top of the second page of this thread looks to be correct. It shows the rear of the seat moving upwards as the suspension is compressed. on edit- I've just reread that section of "Know Thy Beast" and I don't see where he is stating that the rear of the seat goes down. Here is the excerpt: "The makers quite correctly pointed out that the addition of the passenger's weight has only a minor effect on the main springs and that consequently, there is no need to change springs to accomodate varying weights of crew, within limits. But the fact is that the seat mounting system is so designed that 3"of movement in the rear frame(ie the wheel) imparts 11/2" movement to the seat at the extreme rear end. In other words, the passengers rear end, poised on the thinnest part of the seat squab, is only half sprung. No wonder some of them complain.....Some cries of anguish must have reached the factory for the powers that were eventually reacted by fitting a fully sprung seat on SeriesD models." The only thing I would disagree with in the statement above is the mention that the seat at rear is "half sprung". This seems to be a common misconception tied to the fact that there is a mechanical 2 to1 ratio of movement between the rear axle and the rear of the seat. This is not in any way the same as having the seat rear riding on suspension, partially or otherwise.The quote from the manufacturers says it all " the passenger's weight has only a minor effect on the main spring" [/QUOTE]
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The Passenger rides on a rigid frame
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