So how to build a Flevo rear pivot Python uno 1
After much
arguing constructive dialog between the :-
North and we build it with what we have and the
South ' it ain't any good unless the lathe has been deployed '
This is the result:-
Grey card represents frame 1.5" sq 1.5mm wall :-
lower frame disappears to the left to the rear wheels
upper frame has upper seat mount above pivot area and to left upper rear seat mount and front end pivot bracket on the angle to the right
as you can see the piece that controls the distance between the 2 parts of the frame is the rubber elastomer also as it is the farthest part of the joint away from the frame open ends so it need doing first
lower part of elastomer has a M10 threaded rod it is screwed into a M10 hex coupler which does not quite fill the 1.5" tubing , so I have welded the coupler to an off cut of 6mm plate that will be welded to the inside floor of the tubing through 2 x 6mm holes , this will allow the elastomer to screw in from the top and not have any hardware for this joint under the frame.
the upper frame tube will have a M10 i/d anti crush tube welded in and a M10 bolt will screw into the top of the elastomer screw in maybe with a bit of locking compound ?
The female rod end will be mounted on a 4" M12 bolt [ horizontal in this picture ] and inside the tube welded to a pair of 3mm plates plug welded from the outside through 4 x 6mm holes / plate
The vertical M12 bolt will pass through a M12 i/d crush tube and be held under the upper frame by a lock-nut , I expect the female rod end will be free to pivot a little however it is captive and has no where to go ?
The positioning of the parts is an almost exact copy of the Flevo bike method except on the Flevo trike the frame tubes are no parallel ?
What I am not comfortable with is the axis for the rod end pivot does not pass through the vertical centre of the elastomer ?
Does that mean the elastomer is compromised in some way ?
of course the rod end could be in the vertical centre of the elastomer , it would just be very messy looking ...
answers on a postcard please..
Paul