Search results

Date Relevance Most replies

  1. K

    Building a "CommuterBooster" style friction drive

    The highest wattage I've seen so far was around 1100. I only measure occasionally when I change something in my setup, and I use a WattsUp, which doesn't seem the most accurate of measuring methods. The high speed runs don't produce these high amps, at speed the drive doesn't do more than about...
  2. K

    Building a "CommuterBooster" style friction drive

    I'm using the same mechanism. The motor swings from the stop freely to the wheel, and while engaging climbs up until it hits the other stop. The rubber inner tube cover with the padding underneath helps. This works for speeds up to around 25-30mph. Beyond that, the motor has a hard time...
  3. K

    Building a "CommuterBooster" style friction drive

    I tried to make a bracket to mount the motor from the seatstays and the difficulty there was that the motor is attached on one side only and there is a lot of twisting force that the mounting bracket has to counter. Ideally you would clamp down on both of the short welded sections (with some...
  4. K

    New Friction Drive Project

    This one has a setting called active freewheeling: https://www.hobbyking.com/hobbyking/store/__42763__Hobbyking_YEP_120A_HV_4_14S_Brushless_Speed_Controller_OPTO_EU_Warehouse_.html
  5. K

    Building a "CommuterBooster" style friction drive

    Assuming that the Dahon has a 68mm BB at least, it would be possible to mount it behind the BB, with a bracket attached to the two tubes stabilizing the BB. The bracket shape would be a little more involved ( and probably require some molding to get the exact shape). The main difference between...
  6. K

    New Friction Drive Project

    One of my ESCs has some resistance, the other can actively freewheel, so the motor spins without resistance (Heli ESCs seem to have freewheeling settings).
  7. K

    Building a "CommuterBooster" style friction drive

    I built the mounting bracket myself (I had access to a machine shop, but only used a band saw and a drill press). I put a servo controller that I found on polulu.com in front of the ESC. The ESC is set up so it just doesn't do any soft starting or braking, just syncs the motor correctly at the...
  8. K

    Building a "CommuterBooster" style friction drive

    Update on my bike. I put the Felt on a little diet. I built new custom wheels, the easiest way to save weight, new wheelset came in at 1470gr for a tad over $300. Not bad for a set of disc wheels. I mounted my Cannondale Hollowgram SL cranks, a new cheap carbon seatpost. Total weight with the...
  9. K

    Another friction drive project

    Kosilica, sorry I haven't had much time lately to update here. I will try and get some sketches of my bracket up tomorrow. Meanwhile, I tried my other motor on my bike, the G110 EasyMatch at 219 kV (pretty similar to the motor you first mentioned). It runs fine, but it makes a lot more noise at...
  10. K

    Friction drive building questions (shopping list added)

    After spending a whole weekend cleaning up my friction drive setup (mostly wiring, adding a remote etc), I was comfortably hitting 60km/h on a flat road today. This is with a 63mm 245 kV Easymatch 160 motor, the Turnigy TZ85A ESC, and two 6S Multistar 5.2Ah LiPos, plus the MiniMaestro servo...
  11. K

    Friction drive building questions (shopping list added)

    If you're running with a 6s battery, the Tz85A is fine and much cheaper. When riding with it and a Multistar 6s pack I'm seeing peek amps around 70, and it handles it well. The ESC doesn't get hot, even after a long continuous run (for me about 3 minutes max). I have not had enough time with...
  12. K

    Friction drive building questions (shopping list added)

    My 6S ESC (Turnigy TZ85A from HobbyKing) does not need any caps. My HV ESC (YEP120) has caps built in, no sparks when connecting it up to 8s batteries.
  13. K

    Friction drive building questions (shopping list added)

    I'm getting over 50km/h with a 245kV 63mm motor on 6s battery. Might not be the most efficient, but works fine. LiPo batteries and standard R/C ESC . No issues with overheating. But I'm mostly using it to boost my speed. If you plan on running only on motor power, you might be better off with a...
  14. K

    Another friction drive project

    kosilica, looks like your frame has plenty of room to accommodate the drive unit. I didn't mean to confuse with my first comment, what I built is a friction drive. It looks like your frame has a cable for the front derailleur running down behind the seat tube. This would be in the way of the...
  15. K

    Building a "CommuterBooster" style friction drive

    Here are some pictures of my current setup: The bracket, controller, and the "black box", with the button and speed sensor wires going in: And here is a better look at the rubber cover of the motor: I ordered a simple RF remote which will replace the ugly button wire, and give me a remote...
  16. K

    Building a "CommuterBooster" style friction drive

    A little update on my friction drive build. Two days after the last post, the Felt F5X met it's sudden demise when I got hit by a car while going about 20mph. I was going straight in a residential neighborhood in the bike lane, when an oncoming car turned left right into me. I got lucky and only...
  17. K

    Another friction drive project

    Friction drives don't seem to be that popular around here anymore. Here is what I built recently: http://endless-sphere.com/forums/viewtopic.php?f=28&t=63553&p=952009 I used the G160 motor (My eflite 160 seems to be the same motor)...
  18. K

    Building a "CommuterBooster" style friction drive

    After some more testing I made some changes to the setup. The servo tester is really not that great as a throttle, especially in an emergency, when it is hard to turn it off. I added a switch to the servo tester to chose between off (default) or the set speed on the servo tester (determined by...
  19. K

    New Bafang Crank-Drives

    Dave, I'm not in SF, but a little further south in Palo Alto. I'd be happy to let you ride my Giant XTC with the BBS02 750W drive installed. While I have not ridden the Bosch drive, I find the PAS on the BBS02 very smooth. PM me if you want to give it a try. - Michael
  20. K

    Building a "CommuterBooster" style friction drive

    I have built 2 ebikes so far, a simple 400W geared hubmotor conversion, and a Giant XTC full suspension BBS02 750W MTB conversion. The Bafang bike works really well, but I realized that the overall system has become so heavy that I actually needed the motor all the time. I found Adrian's...
  21. K

    Index of non-hub motors used on E-bikes, specs & links

    I've built a prototype friction drive with the following motor: E-Flite Power 160 (http://www.e-fliterc.com/Products/Default.aspx?ProdID=EFLM4160A Brushless 14 poles 245 kV Shaft diameter 8mm overall length 64mm diameter 63 mm I've put on about 100 miles in the first week and it works great...
  22. K

    Boring Build: Bafang 750W / Giant NRS1

    Boring can be a good thing when it comes to installing a conversion kit. :wink: I was looking for different bikes on craigslist, and also picked up a Rocky Mountain Element Sport, which also works great for this kit (the lectric cycles version supports 73mm BB sizes), but the Giant was 7...
  23. K

    BBS02 Distance between crank arms?

    Mine measured 164mm total with the drive side being 11mm further out then the non-drive side. Hope this helps. - kolby
  24. K

    Boring Build: Bafang 750W / Giant NRS1

    Long time lurker here, presenting my second electric conversion. After building up a Trek FX hybrid with a geared hub motor in 2012, I finally broke down and ordered a Bafang 750W kit with a 48V frame mount battery from lectriccycles. I find the hybrid quite uncomfortable at higher speeds, so I...
Back
Top