Is that a mock up, I can see the Bentley Draper friction damper arrangement and the lowered damper, but I cannot see any method of supporting the seat at the rear.
F: Frame Rear seat stays friction
- Thread starter Simon Dinsdale
- Start date
I know it's been mentioned before, but those seat stays that had like a shock absorber shroud with internal springs with a telescopic arrangement........Did they work ok, or not long enough to make much difference. I'd love to fully spring the rear of my bike but I don't want to change the standard look ........It's a hard one to sort out easily.
Greg, You could try the Paul Packman mod, not quite standard but sort of retains the original seat stays, he replicated the original brackets but with a tube clamp built into them, he then clamped the device further up the frame tubes towards the top casting, now I have not seen this experiment in operation but Paul recons that if you remove the spring boxes and damper so the rear frame is free to pivot you will find a position for the clamp on ears where the frame will travel through its arc but the seat will stay more or less stationary, Paul is no fool and I have taken his word for it. You would have to decide whether to remove the existing ears or leave them in situ, which I guess would defeat the object of the exercise somewhat.
There are no seat stays...it is a cantilever seat attached only to the UFM. It is not a mock up. Raced by Phil Heath and It blew up at the Curragh circuit in Ireland, if I remember correctly. The racers had to return the machines to the Factory and this one had the RFM built into the Vincent three wheeler.
David
David
I keep the seat stay dampers on the B just tight enough to not go adrift and use loctite, but another area that I like to check is the Craven rack with all its rotating bushed joints moving with the suspension. That is like having lots of additional mini friction dampers. I use nylock nuts so there is no binding, and check for free movement but I assume there is still a lot of friction contribution, especially when carrying a load. Still, I have no complaints with compliance when it is added to the Thornton rear damper.
I seem to remember Carl Hungness coming up with a neat solution to going fully sprung without the need for an additional frame or supports off the rear footrest plates, I think he used the the footrest hanger through bolt and a modified battery carrier to support the seat using flat supports coming up between the rear spring boxes, it looked very neat but not sure how strong it would be for a rider and pillion passenger of reasonable proportions, anyone know if the mod was widely used?
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Just to show Greg what Peter is talking about, I too think Paul is very clever, But I think he had had a drink when he came up with this !. Cheers Bill.
I have drilled them and put in a POM (Acetal) bearing, first locked them up with piece of alu.
Bill, I have never seen Paul with a pillion passenger, so most of the weight the seat is carrying is at the front mounts, I can't help but feel that with the suspension on full bump with moderately heavy pillion passenger, that something might give/collapse.