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<blockquote data-quote="t1h5ta3" data-source="post: 1026141" data-attributes="member: 16823"><p>mayby a picture will help visualise the loads. </p><p>like i said, CG is almost directly above the notch.</p><p>the rear portion of the frame has a cage and is fairly triangulated, lets asume relitively stiff. </p><p>under acceleration the rear suspension will be trying to lift the casis ( depends on how much anti squat you desighned into the traction bar) the same force is also piviting off the shackle of the frot axle in the same direction. you get even a little wheel hop, and now you are not only adding the weight of the rig to the pivit (notch) but you are cycleing the load. ( think about taking a pice of flat stock and rapidly bending back in forth like when you cut most of the way thru and your brakeing the bur off... )</p><p></p><p>can you seen now what im talking about as far as taking a 3" tall rail, then removing 1/3 of it not a big deal in a diferent location, but because its right where you go from a stiff portion of frame to an unsuported section, and because its directly below the center of gravity, and because of the load from suspension tieing in there theres alot of loads involved.</p><p></p><p>now a simple bar tirangulating from the front of the frame rail to the cage, and fire wall ( shear pannel) and now you are distributing the load and re directing the force. </p><p></p><p>your a smart kid, build a model to mock it up out of straws or balsa.. youll see what im mean. im sure you did some thing like that in school didnt ya?</p></blockquote><p></p>
[QUOTE="t1h5ta3, post: 1026141, member: 16823"] mayby a picture will help visualise the loads. like i said, CG is almost directly above the notch. the rear portion of the frame has a cage and is fairly triangulated, lets asume relitively stiff. under acceleration the rear suspension will be trying to lift the casis ( depends on how much anti squat you desighned into the traction bar) the same force is also piviting off the shackle of the frot axle in the same direction. you get even a little wheel hop, and now you are not only adding the weight of the rig to the pivit (notch) but you are cycleing the load. ( think about taking a pice of flat stock and rapidly bending back in forth like when you cut most of the way thru and your brakeing the bur off... ) can you seen now what im talking about as far as taking a 3" tall rail, then removing 1/3 of it not a big deal in a diferent location, but because its right where you go from a stiff portion of frame to an unsuported section, and because its directly below the center of gravity, and because of the load from suspension tieing in there theres alot of loads involved. now a simple bar tirangulating from the front of the frame rail to the cage, and fire wall ( shear pannel) and now you are distributing the load and re directing the force. your a smart kid, build a model to mock it up out of straws or balsa.. youll see what im mean. im sure you did some thing like that in school didnt ya? [/QUOTE]
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