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  1. CWAnthony

    Question regarding Roll Centers of a Double A-Arm suspensions

    Thanks for the posts Bob, the sketches look good. What have you used to generate them? I've not come across Olley's rule before, I'm keen to give it a try on a CAD sketch generator tonight. Is this mentioned in Milliken's Chassis Design? So which parameters will you be looking to change when...
  2. CWAnthony

    Question regarding Roll Centers of a Double A-Arm suspensions

    Bob, Thanks for the reply. Sounds interesting. I can't actually find a PM feature on this site I'm afraid (I may have missed it?!), could you email me at - chris . w . anthony [at] hotmail . co . uk ? I'm very keen to see what you've come up with. Best Regards, Chris
  3. CWAnthony

    Question regarding Roll Centers of a Double A-Arm suspensions

    Hi Bob (BUGGAR), I picked up your described plan to build a 7 with infinitely adjustable geometry. Have you got any concrete plans for this? I've considered doing something similar myself, as a learning exercise, because my own experiences of "roll-centre tuning" in education and in industry...
  4. CWAnthony

    Vehicle Drifting

    "suspension design/kinematics being the one that springs to mind" [bigsmile]
  5. CWAnthony

    Shimmy - Around Steer Axis - What do you know?

    Hi Bob, I regret checking the thread so late (0130 over here), as now I can't resist replying! I do appreciate your response though. There is a diagram in the book that describes what Olley means by this rocking axis probably better than I can in words. Perhaps I can scan it in at some point...
  6. CWAnthony

    Shimmy - Around Steer Axis - What do you know?

    Hi Dan, cheers for the reply. I'll check out that Den Hartog material, it's been mentioned to me by a few sources now. I wonder if I could be a pain and refer to my duplicate thread regarding this issue, in the Automotive Suspension Engineering section of the forum -...
  7. CWAnthony

    Shimmy - Around Steer Axis - What do you know?

    Hi Bob/all. Sorry for the delayed reply, but I have quite a substantial update on this subject which I hope many will find interesting. I hope the length of the post does not put people off. First, I should point out that since reading Maurice Olley's notes on the subject, as published by the...
  8. CWAnthony

    Motor and ESC Theory - Current Draw

    Yeah I started with google, I've spoken to a few people in person who I regard to be up on this kind of thing as well. I had some conflicting answers between my sources, hence why I thought I'd get some opinions in here. But yes you are right, it is clear that more knowledge of the subject is...
  9. CWAnthony

    Motor and ESC Theory - Current Draw

    lol. what?
  10. CWAnthony

    Motor and ESC Theory - Current Draw

    It is not the site that is the limiting factor though Lionel, it is the knowledge of the users of the site, and their willingness to share that knowledge. You might think explaining the answer is beyond the scope of this site/yourself, fair enough. But so far I've had a lot of seemingly relevant...
  11. CWAnthony

    Shimmy - Around Steer Axis - What do you know?

    Interesting thoughts Bob. So when you say "hunting laterally", do you mean there is potentially force/torque direction reversals occurring around the steer axis, caused by pretty standard changing contact patch forces/torques and the minimal scrub radius? Seems like an interesting theory, if I...
  12. CWAnthony

    Motor and ESC Theory - Current Draw

    Thanks for the reply Brad. So the motor gets the same amount of current, that's good. You'll have to forgive me, I'm pretty inexperienced with electrical theory and don't know much about inductance. But that is at the motor end, I'll accept what you said and learn exactly what it means later...
  13. CWAnthony

    new vehicle - how much vibration is acceptable?

    Greg, In response to your comment, "People's sensitivity varies by about 5 dB, the goal of the manufacturer is to satisfy some percentage of the buyers, not all of them.". I would like to ask: In your experience, would you say people's sensitivities can change over time, depending on what they...
  14. CWAnthony

    Shimmy - Around Steer Axis - What do you know?

    Hi all, I'm working on a project that on initial shake-down has shown symptoms of shimmy through the steering system. No data was gathered, and observation/driver accounts are not that great at the moment. We can't correlate it with any situational constants just yet (vehicle speed, a certain...
  15. CWAnthony

    Motor and ESC Theory - Current Draw

    Chaps, I appreciate the replies, but I'm afraid neither tells me what I would like to know. Waross, I understand the equations of energy and power in their simplest form. Lionelhutz, I understand the basic rules of DC motor operation too. My confusion stems from the DC motor's interaction with...
  16. CWAnthony

    Shimmy - Around Steer Axis - What do you know?

    Hi all, I'm working on a project that on initial shake-down has shown symptoms of shimmy through the steering system. No data was gathered, and observation/driver accounts are not that great at the moment. We can't correlate it with any situational constants just yet (vehicle speed, a certain...
  17. CWAnthony

    Motor and ESC Theory - Current Draw

    Hi guys, I'm trying to understand (DC brushed) motor behaviour in certain situations when coupled with a PWM ESC (powered by 24V battery). The following situation is not realistic but will help me to understand, I'd appreciate any replies. Imagine my motor is in an application (a wheeled...
  18. CWAnthony

    Equivalent Inertia - Geared System

    Hi guys, I've just been working through some info related to the titled 'equivalent inertia of a geared system' found in the following links (thanks to David Grieve for posting them, whoever you are) It's probably all simple stuff to you guys, I understand most of it except I am confused by...
  19. CWAnthony

    Schrader Valve - Male NPT Fitting

    Hi all, Thanks for all the links and suggestions. I have been casually persuing this over the past couple of months with not much luck. Schrader can supply valves that will do the job perfectly, but require a minimum order quantity of 500 or £100 (I only need 5 of them!). McMaster-Carr supply...
  20. CWAnthony

    Schrader Valve - Male NPT Fitting

    Thanks for the replies guys. It will be used to charge an accumulator, any idea on the pressure ratings of the more heavy duty ones?

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