after having bent 3 frames already, a major suspension update was needed. frames bent from crap suspension
or crap riders who think they can jump
(either a very hard spring that can handle jumps but is like concrete everywhere else, or a soft spring that can handle normal off-roading but bottoms out on jumps, and because that force is only transmitted from the left to the frame the frame bends leftwards-up, or a spring somewhere in the middle that does nothin well).
no space for a mono-shock because the cylindre already sit's there. IF the suspension bottoms out, the forces should be transmitted evenly through the frame, and it should be progrssive.
So how can we do that ? just put a hard and soft spring in series. so I came up with progressive-linked twin soft and hard shocks
:
made a right-side swing-arm, so IF the suspension still bottoms-out, it is transmitted to the frame from both sides.
both are linked through arms connected to an axle that can turk inside bearrings and both push against each other.
first, the soft one (yellow) will be compressed, while the blue one will not. but off course the blue one will also go up, so it will push against it's arm and make the axle turn. because of this, the arm on the other side will also push down on the soft spring. so the soft is being compressed from both sides. the amount of compression can be set-up by changing the length of the arms. for example : longer arms on the blue hard one will make the axle turn fewer degrees for the same raise of the rear wheel, making the yellow softer. I f you make the arm of the yellow shorter, the degrees will be changed into less compression. all because of the relation between turning degrees and the amount of circumferrence the comes with the length of the arms.
when the yellow is fully compressed, it acts like a pushrod. if the swing arm goes up further, obviously the blue spring is being compressed, but the yellow will make the axle turn opposite direction now, and also compress the blue one from above.
so I can play with different springs (have 2 different softs and 2 hards at the mo), pre-load on each spring, the length of the arms and I could even make different axles with different angles for the arms. I think that should be plenty to find a good set-up