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  1. mauimart

    E-Hawk: Electric Aircraft Build

    We just started our build of the EMG-6 Motor Glider. Details can be found at our website: www.e-hawk.org We are still in the very early stages of the build process and have not spec'd the propulsion system as of yet. If anyone has any recommendation for an appropriately sized motor (10kW to...
  2. mauimart

    New Passenger Drone

    Here's a new entry into the passenger drone market. http://passengerdrone.com/ Anyone recognize the motors?
  3. mauimart

    My First 18650 Battery Pack - KFF

    This is my first attempt at a 18650 pack build. The pack will be fitted to a Specialized Big Hit running a first generation MXUS in a 24" wheel. I still have to build an enclosure for the pack. Specs are as follows: - 20S8P using Sanyo NCR18650GA cells (from tumich) - Custom designed and...
  4. mauimart

    Bicycle Power Generation Using Hub Motor???

    I, with some students, would like to build a stationary bicycle power generation station to be used as part of an energy course in a high school. I have built one of these before using a bike on a trainer that spun a car alternator through a belt drive. The alternator regulated to about 14V...
  5. mauimart

    Mauimart - Mid-mount Hub Build

    I finally got around to starting my next build. It's a 2004 Specialized Big Hit which will be powered via a two-speed mid mounted hub motor. The plan is to attach everything using a bolt-on strategy--no welding or punching holes into the original roller. Initial setup will be as follows: -...
  6. mauimart

    Lil' Seb - Formula1 Golf Cart w/ video

    Here's a conversion you don't see often. My brother converted his golf cart to a Red Bull F1 car, RB8 chassis I think. RvWUfd4dduM
  7. mauimart

    Kawasaki KX125 Electric Build

    Here's a project that I am helping my brother with. It's a 2005 Kawasaki KX125 chassis that will be powered by: Motenergy ME-0810 DC Permanent Magnet Motor Alltrax AXE4834 Controller CALB 40Ah grey cells (16s) Should be fun when done. Some preliminary pics.
  8. mauimart

    Gecko takes one for the team!

    The other day I entered my garage to the smell of burning PCB. I immediately thought that it was one of my e-bikes and associated electronics that may have been the cause. However nothing was charging or left on so that was subsequently ruled out. I then directed my attention to my grid-tie...
  9. mauimart

    Turnigy C80100 Performance Data

    I'm currently running a rewound Turnigy 80100 and thought I would try to characterize some of its performance characteristics. This is obviously a popular motor for non-hub drive setups and as such it would be nice to know what some of its limitations are, and under what circumstances its...
  10. mauimart

    Wack-Off 5065™ E-trimmer

    I detest weed wacking to begin with so when the bloody 2-strokes won't start all hope is lost and I just let the weeds grow. So with a few RC bits laying around and some time over the weekend I came up with this. It's got a 5065 - 270kV outrunner, 6S2P 5000mAh bricks, and a One Hung Low $25...
  11. mauimart

    Chip Yates Electric Aircraft (unofficial) Speed Record

    Outstanding project and story. http://www.airventure.org/news/2012/120725_new-pilot-brings-worlds-fastest-electric-aircraft-to-OSH.html rNAPLxZtoPg
  12. mauimart

    Turnigy C8085 Dual Controller 6-Phase Rewind

    Here's avideo of a C8085 outrunnner rewound in a 6-phase, wye configuration. 10 turns (1 meter per tooth) of #14 AWG 36 mOhm phase resistance 162 kV For testing I am using two ebay "el cheapo" 100A (yah right) ESC's, one for each set of phases. At WOT the no load current is 3.7A @ 23.9V and...
  13. mauimart

    3-Wheeler Test w/ VIDEO

    We just did our first 'open-road' test of the student-built 3-wheeler EV. It's an old front-end of a GEM car fused to the rear of a motorcycle. It's way over-powered (warp9) for its weight and handling capability. I had it up to 56mph and that's when it started getting a bit squirrely. It...
  14. mauimart

    What constitutes a Lipo Dud?

    I just received, from the USA warehouse, a set of six 5Ah/6S/20C Turnigy Lipo packs and, not unexpectedly, it looks like I may have a couple of dud cells. Pack 1 (s/n *3629855) data: Pack 1 cell voltages upon unboxing: cell voltage 1. 3.849 2. 3.850 3. 3.855 4. 3.784 *-possible...
  15. mauimart

    To nano-tech or not to nano-tech

    The recent "Farfle is an evil person, don't talk to him!" thread about nano-tech batteries got me thinking... I was just about to pull the trigger on 6 pieces of the Turnigy 5000mAh 6S 20C battery when the discussion of the Turnigy nano-tech 6000mAh 6S 50C came up. So at this juncture I am...
  16. mauimart

    Turnigy 80-100 - Why so hot?

    I have been messing around with a cheapo 72V Hua Tong 15-FET controller to see how well it spins my Turnigy 80-100 outrunners. My thinking is to use it as a replacement of my Kelly if and when it blows. In any event I was spinning the 130Kv stock wound motor under no load to see what the max...
  17. mauimart

    Build No. 2 - Reduction Drive - now w/ NEW video

    I am planning a second build based on a Turnigy 80-100 outrunner running a reduction drive using a generic pocket bike transmission/gearbox (ebay). I have put together a mock-up of how I'd like to see things come together. The outrunner and gearbox would be mounted to 1/4 inch thick plate...
  18. mauimart

    Electric Lazair Takes Flight

    An electric powered Lazair ultralight aircraft recently completed its maiden voyage. It is equipped with two Turnigy CA120-70 motors and Zippy batteries among other RC components. The full thread can be found at: http://www.rcgroups.com/forums/showthread.php?t=1412424 Very cool indeed.
  19. mauimart

    Calb's 40ah cells ?

    I am currently running this exact setup. It might be a bit bulky for a foldable but on my generic mountain bike it's not too bad. I routinely do about 3c as I live on the slope of a significant mountain. The bike has plenty of power for the hills and I've had her up over 45mph on the flats...
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