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  1. T

    A new frame

    I have been working on a new frame design for a while, progress has not been as fast as I would have liked but I have now got one together. My thinking behind this frame is to produce and make available to others a frame that people could move their own cycle parts over to from an existing ebike...
  2. T

    72v 50a sine wave controller

    Has anybody used one of these yet? http://www.aliexpress.com/store/product/72V-2000W-18-mosfet-motor-brushless-sinusoidal-wave-controller-for-electric-bike-hub-motor-controller-G/937734_1870526393.html They make some claims about the benefits of sine wave control over square wave, is it bull...
  3. T

    9c clone motor

    Recently I have been making some motor axles to repair broken or upgrade hub motors, I have converted some to single sided mounting for a 4 wheel buggy type thing for BigSi on here, he was importing the motors himself from china and I got him to tag one of the 9c clone motors he brings in onto...
  4. T

    BMS question

    In theory a bms should be a good addition to a pack and certainly when used daily on a commuter they can be but in my experience when a pack is not used very frequently they can be a problem. The power consumption of the bms itself can over times of inactivity pull a cell or 2 down. So my...
  5. T

    My HT35 has been on a diet

    I just fetched this back from my tame cnc shop, the motor has now shed 3 1/2lb in weight with just over 2lb of that having come off the magnet ring. There is still no detectable magnetism on the outside of the mag ring. The side plates have given a little up too but will remain hole free...
  6. T

    Ping battery size info required.

    Many of the different volt and amp hour configurations of Ping packs are quoted on his website to be 105mm wide, I was just wondering if a few people could measure theirs to see how his quoted dimensions relate to actual size. The reason is I am making a battery box that I would like to...
  7. T

    The BMS, good or bad?

    How many times have we had people post on here that their over the counter battery or turn key bike wont function because they left it alone for a short period. Or the battery voltage is too low, Or the mileage from a charge is not what it used to be. There seems to be a massive lack of info...
  8. T

    Making an Hall throttle

    I have a Magura throttle that misbehaves due I presume to a cracked track in the pot, I also have the curved magnet out of an old hall throttle that had those battery gauge lights built in, it got fried! So I thought I would bond the magnet into the Magura and install a linear Hall sensor, my...
  9. T

    Control system choices

    In the past I have used Justins 7240 controllers in conjunction with a CA and been very happy with them to the point of not wanting to try anything else. Small size, utterly reliable and plug n play (other than the phases/halls, but I can manage that) But part of this is from not knowing what...
  10. T

    Battery dc trip

    I am building myself a new bike and wanted a way of isolating the battery, this switch would also act as a fuse, do the more electrically technical ES members think this would be suitable for a 20s lipo setup running a 40a controller? and would it be of any benefit to put one in each of the...
  11. T

    20S 4P from 5000mah Hard packs

    There has been a lot of questions asked recently about lipo and building packs, charging etc. So as I have just finished assembling a new pack made from 20 x 4s 5000mah Turnigy hard case producing a 20s4p pack (84v off the charger and 20AH) I thought I would show a few pics to give people an...
  12. T

    Battery isolation switch

    Recently there have been a few battery deaths due to controllers being left on. I like to use Justins controllers because they state no current draw when switched off, i have used these before and left them connected but turned off with no problems, which is all well and good but what if I...
  13. T

    Crystalyte X5 axle, who wants one?

    We have a UK ES member who is in need of a new spindle for his X5, if I took this on for him it would be wise to make a batch of them, but how many? I don't want to be stuck with a shed full or leave someone without that has a need. So if you want an X5 spindle or a few let me know. When we know...
  14. T

    Voltage display

    Is there a product out there that can display all of the cell voltages on a single display for a 20s lipo pack, I am sure I have seen one with a bar graph display which lets you see the cell balance at a glance. The other option is 4 cell logs so each can display 5 voltages, I know I could do it...
  15. T

    BLDC Flux ring thickness

    Is there a basic rule governing the thickness of the magnet backing ring? I wish to lighten an HT3525 motor, it has 6.85mm thickness to the steel ring in the thinnest area, in the centre between the spoke flanges, the magnets are about 3mm thick, there is no detectable magnetism present on the...
  16. T

    Tench is back!

    Evening chaps, just logged in for the first time in ages!! its good to see a lot of familiar names are still here! Its been a bit of a ride since I was last here, divorced, lost my home and workshop! not to mention divorce being expensive, but very good value for money!! :D anyway, I have...
  17. T

    History has been made today!

    http://www.iomtt.com/News/2012/06/06/History-is-made-in-the-2012-SES-TT-Zero.aspx
  18. T

    Question about Lifepo4 max cell voltage

    As the title says, i use both RC lipo which i know needs to be strictly kept under a maximum of 4.2v per cell and life batts, in particular a V2.5 Ping. I fitted one to my first build which uses a 900w Cyclone kit with a current limit of 35a set in the CA, this bike and battery perform...
  19. T

    I.O.M TT

    Just watched the first race on tv, this was the Superbikes out for their first race, conditions were very good, the race went the full 6 laps distance (226 miles) John McGuiness won it in 1 hour 46.03 setting a new race record speed of 128.078 mph ave! You Aussies where well represented...
  20. T

    voltage monitor for lights battery

    I have been looking for an alarm or similar device to keep me informed of the SOC of my 3s pack running the lights on my bike, previously i have used the Magicshine lights that have this function built into the on off button. I have seen all the lipo alarm type things but wanted a neater...
  21. T

    My series parralel changer

    Several people have asked about how i did this, its no secret i just have not got around to doing an explanation but as today is a national holiday in the UK and it is raining i have found the time. The system is made of 6 6s zippy 8ah packs, these are permanently parralelled at cell level into...
  22. T

    RC equipment guidance

    Hi guys, I am an RC virgin so keep it clear and simple for me please. I am planning an ambitous RC build for next winter but thought i would do a simpler one first to get a better feel for them which will help with the final design. For this one i would like to do something like an 80-85...
  23. T

    Motor choice

    If you have seen my builds you may think i know which end of the spanner to hold and am a seasoned campaigner but having not been around electrickery powered bikes for very long i am a bit lacking in the knowledge of just what is available in the way of motors. I am starting to toss a few...
  24. T

    Help please, i think i may have a problem with my CA

    Right guys, i have a problem with my CA or my controller or something anyway! that i could use a bit of advice on, this is not the first time i have fitted one of these on a build and i used one on my Bomber for a year aswell so i am quite familiar with them. This one however wont play ball, it...
  25. T

    Specialized Big Hit FSR with midmount

    Been building this over the last couple of months and it is nearly finished now so i thought i would put some pics up, This is the bike as it was when i bought it; and how it is now :shock: The motor is an HS3540 and a 40a controller running 6 x 6s 8000mah 30c zippy packs. I have a few...
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