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  1. drsolly

    Pulse jet powered bike

    I just love this. Colin Furze is a plumber by trade. He built a pulse jet using just an angle grinder and duct tape. Then he built a bigger pulse jet. Then he attached it to an old bike. He starts it with a leaf blower, ignites it with a blowtorch. Then he rode it at 50 mph. No helmet...
  2. drsolly

    Disneyland

    I was at Eurodisney, and we watched the Grand Parade. There were some cast members whizzing around, twirling, swooping ... obviously on something on wheels, and electrically propelled, but what I couldn't guess, is how they are controlled. It has to be controlled by the rider, otherwise they...
  3. drsolly

    Forza revived.

    My first electric bike was a big, sturdy Forza. It has a 36 volt motor, and it went well. I used it for about three years. But it suffers from a major drawback - it isn't a folder. That means that A) to carry it on the car, I have to put on a bike carrier, and while that's on, I can't open the...
  4. drsolly

    Electrical connectors

    It took me quite a while to research this; I thought I'd save other people the grief. The problem I had was, I knew what the connectors looked like, I didn't know what they were called. And I couldn't find an ebike vendor that sold connectors. I find two main types of connectors on ebikes...
  5. drsolly

    Brushed vs brushless

    I have two 250 watt motors, on two different bikes. One is a brushless, sensored, one is brushed. Both have 20 inch wheels. Both came from a bike branded as "Synergie", that brand no longer exists, I think. One of the bikes frames (aluminium) broke, so I built the brushed motor into a different...
  6. drsolly

    Downtube brushed

    Several years ago, when I was getting into biking again (50 years after biking at college), I got a Downtube viii h for my birthday. http://downtube.com/images/2008_Bikes/8H/8H_Standing.jpg It's a 20 inch wheel folder, aluminium, with hub gears; an 8-gear Sturmey Archer gearbox. The nice thing...
  7. drsolly

    10 AWG cable

    I've been sniffing around Ebay for good deals on 10AWG cable, and I see that a lot of sellers are offering 10AWG car amplifier kits, which include 5m of 10AWG red, 1m of 10AWG black, and various other bits and pieces, all for around £7 (about $12), postage included. I also see the same thing in...
  8. drsolly

    Stuttering

    I have a bike that was using the Infineon 12FET 4110 that I had from em3ev.com; it was working well, but I wanted to see if I could use a smaller controller. And someone here explained to me that 3077 FETs are better (less power consumed by the FETs) at low voltages. So I installed the 6 Fet...
  9. drsolly

    Internal resistance

    My array of lamps, with ammeter and voltmeter, lets me (with some minor arithmetic) know the IR of my batteries. I haven't tried to measure IR of individual cells, because the information would be of no use to me - I'm not going to dismantle a battery to salvage good cells, I'll just replace the...
  10. drsolly

    Cheap ammeter/voltmeter

    I got one of these: LED Digital Volt Amp 2 in 1 Panel Meter Voltmeter Ammeter 100V 100A Blue/Red http://www.ebay.co.uk/itm/161224223929?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 Costs about $5 It arrived a couple of days ago, and I was working with it today. It will go up to 100...
  11. drsolly

    Answers for Newbies

    I'm no expert, buit I was a newbie recently enough that I remember some of the questions I had trouble with. So here's a few answers. Q1. What multimeter should I buy? A1. Anything. I just did an Ebay search, the cheapest one that came up was about $4, and it looks to me to be just fine for...
  12. drsolly

    Rethinking my battery wiring.

    After cal3thousand's reply to my posting about how I nearly killed my battery, I've done some thinking. He's right, I should be hooking my batteries up in parallel. So here's my plan. I have 14 batteries, Hobbyking 4s 20C hardcases. They're all good, I measured the internal resistance using...
  13. drsolly

    Power for my PDA

    I want power for my PDA up at my handlebars; the battery it has, will last for about 7 hours, which is usually enough for a day out, but sometimes I go out for a lot longer than that. I had thought of using the bike battery, put through a voltage reducer, and a switch, and a fuse for safety, but...
  14. drsolly

    Curious behaviour from my bike

    I took my bike out yesterday for a 10 hour caching marathon; 100-odd caches. When I started out, the motor wouldn't run until I'd gotten up some speed, which was a bit annoying, Then, after about an hour, it refused to run at all. So I stopped, changed the cable from the batteries to the...
  15. drsolly

    Ammeter on my handlebars

    I'd quite like an ammeter on my handlebars, but I don't want to run four 10AWG cables up from the battery to the handlebars to be able to use one of these http://hobbyking.com/hobbyking/store/__28860__HobbyKing_Compact_30A_Watt_Meter_and_Power_Analyzer.html So I did a bit of sniffing around...
  16. drsolly

    Infineon vs Lyen

    I've got a couple of Infineon controllers from http://em3ev.com and I'm very happy with them. I've been reading here about the Lyen edition, and I was wondering - what would be the advantage of a "Lyen edition" over the Infineon? I'd be looking at a 6-fet or a 12 fet. I'm not likely to want to...
  17. drsolly

    Current query

    I have a 250 watt geared hub motor, running at 24 volts. I ran it from 8s Lipo, that's 33.6 volts. I took it out for a test run with a ammeter/wattmeter monitoring, and the amps maximum was 45 amps. Nothing too arduous, just along a local road and down and up a bit of a hill. The controller is...
  18. drsolly

    Resistance riddle

    I wanted to measure the internal resistance (IR) of my Hobbyking 4S batteries. I went about this two ways. 1) I made up a wooden board with ten 12v 50w lamps, with pairs of lamps in series, five of these pairs in parallel. I paired the lamps because I didn't want the 16.8v of the battery to...
  19. drsolly

    Unusual battery box

    I run with my batteries in a saddlebag, because in geocaching, I sometimes have to lift the bike over obstacles, so I like to have a quick and easy way to take the batteries off. I'm using Hobbyking 4S 25C 5000mAh hardcase batteries, and the hard case gives some protection against damage, but...
  20. drsolly

    Programming the infineon

    I got a 6-fet sensorless controller from em3ev, plus throttle, switches and program cable. There's no info about how to program it (and the diagrams you get aren't quite right, the connectors are different), but thanks to ES I found XPD. I installed it on a Raspberry Pi, install was easy, but it...
  21. drsolly

    Programming the infineon

    I got a 6-fet sensorless controller from em3ev, plus throttle, switches and program cable. There's no info about how to program it (and the diagrams you get aren't quite right, the connectors are different), but thanks to ES I found XPD. I installed it on a Raspberry Pi, install was easy, but it...
  22. drsolly

    Drive harness for the bike

    Before I heard about CA, I wanted something to tell me what was going on, something more than the 1-2-3 blobs on the bike's blob-meter. After I heard about CA, I still like my solution; it isn't handlebar mounted, but I have a simple voltmeter there, and my measuring thing is down with the...
  23. drsolly

    A day of stupids

    Saturday, I went out for a day on the bike. I parked the car at the start of the run, got the bike out, Got it ready, and set off. After a few hundred yards, I had a problem. When I gave the motor some throttle, it acted as a brake. This can't be "wrong connections", I've been riding it with...
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