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  1. colinmseries

    Early 70's suspension analysis

    Thank you B for your interest. I haven't made much progress as I've once again got side-tracked by life. I do not want to waste the time of those that may wish to help on here by keep vanishing, so have decided to properly collect the questions and time to debate the comments before trying...
  2. colinmseries

    Early 70's suspension analysis

    Hi. I've attached a file with a front view, hope it shows the trunnion and front layout clearly. The rear is conventional long-short A arms with bespoke rear upright. The car is a 1972 M series TVR and the front upright, trunnion and steering arms all same as a Triumph TR6. It uses a rack from a...
  3. colinmseries

    Early 70's suspension analysis

    thread800-251968 Hi. As you will see from the referenced thread, I first asked yourselves for help with this project some 4 years ago. Finally, the model has been built, and I'm in a position to start drawing some conclusions and have started this thread in the hope you will help me understand...
  4. colinmseries

    Frame on castors

    Taken your advice and used a pro. Actually, the chassis designer of the cars involved, he was really interested to help! Furthermore the design which at least to me is very original is most likely going into production. I'm just having the prototype. Thanks for the suggestions, Colin.
  5. colinmseries

    Frame on castors

    Hi again and thanks for the suggestions including off the shelf lifts. The option of a proprietary lift for storage had been considered but abandoned due to the space the lifts occupy. The building is only 3.0m internal width so they would render it impossible to move around or squeeze past...
  6. colinmseries

    Frame on castors

    Just seen the other comments, thanks also, and thanks for not laughing. I built the workshop with this idea in mind but without knowing exactly how it could be done. A few months ago I was wondering around B+Q and saw the huge loading on their racking and assumed surely 2000kg would be a breeze...
  7. colinmseries

    Frame on castors

    Thanks to both of you. In the last day the issues about parallelogramming had sort of occured to me. The racking is very secure in the front plane but less so in the side. I can see I'm overlooking the start an stopping issues too. I had intended to use solid wheel castors to avoid flat spots...
  8. colinmseries

    Frame on castors

    Hi. Not sure if this should be in the structural section or here, so please refer me if it should. I'm wanting to build a mobile frame to support two small cars, something I can push around a workshop. They weigh about 1000kg each and the hope is to place one above the other on a frame mounted...
  9. colinmseries

    Scrub, KPI, spindle balance

    Hey, please dont apologise, I'm grateful for your input. I had thought about tyre roll as the car uses old style tall tyres and may well, for all I know, loose its srub when cornering hard. I'm sure I've seen either people on here or somewhere similar talk about this 2:1 ratio of KPI:castor...
  10. colinmseries

    Scrub, KPI, spindle balance

    Thank you for your reply. I intend to maintain the track, it was the choice between more spindle length or less KPI that I'm hung up on. The upright will be remade anyway to lower the car. My interest is in how others viewed the balance of srub, KPI and spindle as now and how they could be...
  11. colinmseries

    Scrub, KPI, spindle balance

    Hello. I’ve re-read the relevant bits of RCVD and looked through my pile of prints from your discussions. Let me tell you what I think is true and I hope you will give me your thoughts. My car has SLA front and rear I am lowering it by moving both the front and rear, top and bottom outboard...
  12. colinmseries

    Jaguar IRS question

    Can I join in please, as this particular question covers some issues I've wondered over many times. I too have heard the reason given as being packaging - the Jags were often criticised for a lumpy boot floor. Norm also mentions that a possible reason was the more equal distribution of the...
  13. colinmseries

    Steering and suspension analysis

    Ok thank you Greg. I dont see how to do the lock part with a drawing board and dont want to be a nuisance. Also, if I'm successful with my chassis I fancied the idea of looking at other types with a program, so I think I'll try the free 30days with susprog3D. With regard to my hope "to explain...
  14. colinmseries

    Steering and suspension analysis

    Thanks for that. Is your thinking that I am a bit stuck doing it myself with respect to ability and cost and had better give up or pay a pro with the type of software you describe? Colin.
  15. colinmseries

    Steering and suspension analysis

    Ok, can I better explain my confusion as it seems to me that wishbone calculates things like KPI, scrub, trail etc. from the chassis pickup and ball joint locations. The threaded bush I refer to is often called a trunnion in old car circles and is everywhere on old Triumphs (Heralds, GT6...
  16. colinmseries

    Steering and suspension analysis

    I have started practicing with wishbone.bas before buying a program but noticed something that I can't see how to input. My front upright is the larger Alford and Alder type that Triumph used for years (TR6 etc.) and it does not use a lower ball joint as the outboard lower pivot. It has a...
  17. colinmseries

    Steering and suspension analysis

    Ok thanks. Just so I am clear, do these programs show changes due to lock? I can do side and front views using a drawing board but don't know how to accommodate the effects of lock. I have a homemade spreadsheet to calculate the real included angle the front upright resides in accounting for...
  18. colinmseries

    Steering and suspension analysis

    I am writing an article for my car club magazine about the development of the car's chassis and would also like to explain some of its suspension and steering geometry with respect to how it feels in use. The car has SLA front and back and I am looking to use one of the free softwear packages...
  19. colinmseries

    Spindle length

    Ok, case closed then. I did speculate in my mind, if with a negative scub setup the two forces would cancel to some extent, since then they act either side of the steering axis. Thanks for listening, Colin.
  20. colinmseries

    Spindle length

    Just one last go at trying to understand this. If the steering is centrepoint how does the length of the spindle introduce kickback? By this I mean the loads come in through the CP which in this case has no moment. I can see how if the wheel was struck at hub height it would have the spindle...

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