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Angle made by arms with horizontal

  1. Dec 7, 2015 #1
    what would be the angle of a arms and how it is to be determined
  2. jcsd
  3. Dec 7, 2015 #2


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    Your question leaves a lot of uncertainty; could you elucidate ? What is this about ? human arms ? armaments ? angle wrt to what ?

    PS [edit after post #3]: if you would have used a term like "double-wishbone suspension" or just "F1 racing car A-arms" the question would have been a lot clearer from the outset ... :smile: Now it looked more like a spurious a
    Last edited: Dec 7, 2015
  4. Dec 7, 2015 #3
    actually, it is for f1 cars.. for rearwheels which are connected to halfshalfts are supported by these a arms.. so, how will these a arm angles with respect to horizal is made?? is it either by rim diameter or any other factor?/..... i need to design rear portion of the car so, i need some help about these angles and some dimensions reqired for the length to be mAde for half shafts
  5. Dec 7, 2015 #4


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  6. Dec 7, 2015 #5
    thanx for your reply.. i would also like to know to which component is the other end of a arms is attached. and angle made by a arms with horizontal not the tire with respect to vertical
    Last edited by a moderator: Dec 7, 2015
  7. Dec 7, 2015 #6


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    I don't think the angle that the wishbone makes to the ground is critical. It's the angle the tyre makes to the road that's critical to performance.

    I think the rear suspension mounts onto the gearbox of an F1 car. I tried to find some photos..




    It's probably better to ask these questions on a motor racing forum.
  8. Dec 7, 2015 #7


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    It is the relative angle of the top arm to the bottom arm that is critical. If both arms are parallel, then the wheel assembly and tire will not change its angle relative to the car frame as they move up and down; however, if the arms are not parallel (as seen in the above top picture) then the angle of the wheel assembly will change angle relative to the car frame and change the camber of the wheel to the ground as the suspension moves up and down. Stated simply, the amount of change of angle designed into the arms is designed specific to each car design to offset the leaning of the car chassis during a turn so as to maintain the same camber of the tire face to the road surface in the turn.
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