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  1. JakubMech

    Designing my own anti-backlash setup

    Do the input torques/frequencies establish seperating forces, which at the right frequency could setup resonance in the system (speed related). With the gearboxes I see, we live with a small amount of backlash and ensure it remains within a prescribed limit. Can the design be adjusted to...
  2. JakubMech

    Roll, Pitch Yaw Inertia's of medium sized sedan

    Im starting up an initial dynamic model of a medium sized sedan, front engine layout, all wheel drive, around 1400kg (3000lb), would anyone have figures for roll, pitch, yaw inertia's for something like this? Regards J
  3. JakubMech

    Power steering when converting IC vehical to full electric

    Hi, I was just wondering what you guys thought would be the best plan of action when faced with the problem of power steering when converting an IC car (say honda civic say 94) to electric. Ive come up with a number of ways to overcome this: 1. No power steering and just adjust the suspension...
  4. JakubMech

    Belt Tracking Question

    The crowning is a centering effect. Basically the high spot pulls the belt towards that area. By tightening one side of a roller it is simulating half a crown.
  5. JakubMech

    Gyroscopic coupling

    Ive experienced this with older four wheel drives using a solid front axle with two longatudinal links going back behind the axle for the longatudinal restraint and a panhard rod for lateral restraint. As in your case if the vehicle hit a bump or a series of undulations at a certain speed, the...
  6. JakubMech

    Determining Ackerman Steering Geometries

    Am I right to say that theoretically akerman should be adjusted to match the tyre lateral friction data. Pro or anti akerman, depending on if the peak lateral forces generated by the tyre happen at increasing or decreases slip angles as normal load increases? JMech
  7. JakubMech

    static stiffness testing of frame

    There is a paper on this in regards to testing a nascar style racecar (winston?), and has verification with FEA and a simple box frame made up. Try to search for that, seems its exacly what your after. JMech
  8. JakubMech

    Control Blade Suspension

    Isnt similar to something like a tri-link suspension? although its got an additional upper arm hasnt it? on the BA falcon? Jakub
  9. JakubMech

    Helical Spring Lock Washer Stiffness

    OK, but no one has anything purely on these helical spring lock washers? I'll look at the bellevilles. thanks Jakub
  10. JakubMech

    Helical Spring Lock Washer Stiffness

    Hi all, Ive tried a few searches but nothing has come up for what im after regarding the stiffness of helical spring lock washers. Im interested in their force deflection curve (stiffness)for standard metric sizes, much like the readily available full disc spring washers or also known as...
  11. JakubMech

    Why position a brake caliper in front or behind the disc?

    You can play around with the upright internal stresses by varying the position of the brake caliper. F1 tried the brake caliper at 6oclock purely for CG reasons, but found the caliper body being "milled" down by the wheel flexing, requiring stiffer setups. Another point can be yaw inertia of...
  12. JakubMech

    Optimal deisel/air ratio and ranges

    Thanks Phil, so would there be a clear-cut highest efficiency point in the ratio range (say 45:1 - just a number i plucked from the air)?
  13. JakubMech

    Optimal deisel/air ratio and ranges

    Hi, Ive been looking into some deisel engines, both NA and turbocharged. For natrualy aspirated version it troubles me that there isnt really a strong control of deisel / air ratio, well apart from the deisel pump (which could offer tight control??). I was wondering what the ranges would be...
  14. JakubMech

    Tyre contact patch vs Spring rates

    yes, lateral load transfer.
  15. JakubMech

    Tyre contact patch vs Spring rates

    I just had a simple model, neglecting sidewall stiffness, basically using tyre pressure and dimensions. Thats cool, this topic encopasses quite a bit of stuff, just thought that ride rate would partly effect the balance, hence weight transfer. Jakub
  16. JakubMech

    Tyre contact patch vs Spring rates

    typo : please disregard "(to go from thin to fat tyres)" in the first paragraph. Or simply reverse to say fat to thin. Jakub
  17. JakubMech

    Tyre contact patch vs Spring rates

    Guys Correct me if im way out of the ball park, but from doing a quick analysis (actually already had a spreadsheet) going to thiner tyres will give a softer tyre rate (assuming all other variables remain the same). So then to have the same effective rate we would need to increase tyre pressure...
  18. JakubMech

    Geometry drawing of method to achieve toe in allowable

    Greg, Can you explain the reason of toe-in with bump - in regards to production cars I assume, ive always been under the impression to achieve the minimal toe during bump as possible. Would this be used to increase the wheel angle during turn/roll, increasing turn response? Jakub
  19. JakubMech

    Body roll.

    F1 car, say around 1/2 degree, with half of that coming from the tyres. This would be most probably max roll experienced. By saloon Im thinking big heavy sport cars, id say around 4 to 5 deg/g which is on the firm side of things. Rally cars would depend, they seem very heavily sprung in roll...
  20. JakubMech

    Hubcentric Wheel Center Bore Clearance

    Force arising from out of balance wheels has a squared relationship to speed. So if your doubling speed, should reduce eccentricity by 4 for the same force. Jakub

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