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  1. mauimart

    E-Hawk: Electric Aircraft Build

    We have made some progress on the E-Hawk since we last posted. See https://e-hawk.org/blog XozK5dgKOac
  2. 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...
  3. mauimart

    New Passenger Drone

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

    kWeld - "Next level" DIY battery spot welder

    Simple sophistication. Brilliant! Have you tried to weld 0.2mm nickel strip with the 5Ah battery?
  5. mauimart

    Farfles Electric Ultralight.

    Can you clarify the battery pack? Is it 29Ah total or 4 x 29Ah? The latter would make a 12kWh pack. And what is the anticipated weight of battery?
  6. mauimart

    Farfles Electric Ultralight.

    Great project--can't wait to see it flying. What's the kV of that motor and what is the gear reduction? What size prop are you planning on spinning? I am going to be embarking on a similar project with high school students. Starting in September we will be fabricating the EMG-6...
  7. mauimart

    Show Us Your Homemade Battery Housing

    @teslanv Hey, looks kinda like mine https://endless-sphere.com/forums/viewtopic.php?f=1&t=85489 without the screws. Are you going to cut a section out of the frame and weld it in? Did you cut the panels with a water jet? Nice.
  8. mauimart

    My First 18650 Battery Pack - KFF

    More progress. I added a bracket for the motor controller and the circuit breaker. Also installed a precharge switch and controller enable switch. Current shunt is also installed via a 3D printed holder.
  9. mauimart

    Supplier for LEGIT Pure nickel strip 0.15 x 8mm

    I bought this one back in October and it is legit. https://www.aliexpress.com/item/Pure-Nickel-Strip-for-Scientific-research-18650-battery-welding-Size-0-2-8mm/32739610924.html?spm=2114.13010608.0.0.qUSxLx
  10. mauimart

    My First 18650 Battery Pack - KFF

    It's 6061 aluminum, 5mm top plate, 3mm all other plates. Fasteners are M3. It does look like the tire will hit under compression yet bouncing up and down on the handlebars with all of my weight I can't get it to touch. I think I'm compressing it close to full travel. If the pack does end up...
  11. mauimart

    My First 18650 Battery Pack - KFF

    Some progress in pictures...
  12. mauimart

    Tesla begins gigafactory battery cell Mass production Yay!

    Samsung's response: https://electrek.co/2017/01/09/samsung-2170-battery-cell-tesla-panasonic/
  13. mauimart

    First Big Lion build.

    I am in the process of doing something similar (https://endless-sphere.com/forums/viewtopic.php?f=1&t=85489 ). Here's some advice based on my experience so far: The nickel strip you have linked in not pure nickel but rather nickel plated steel. It will rust sooner than later. Here is the one...
  14. mauimart

    My First 18650 Battery Pack - KFF

    I designed the holders using Onshape, which BTW rocks, (search '18650 battery spacer') and printed in ABS on a Prusa. All the zip ties survived the initial blast. I later cut them to get the cable away from the cells as soon as possible. I am lucky that short did not cause a fire and/or...
  15. mauimart

    My First 18650 Battery Pack - KFF

    I made a small amount of progress on the pack, just prior to a significant setback. I soldered the end connections to a strip of nickel plate and then spot welded the plate to the terminals of the pack. I was quite pleased with the connections and confident that it would hold up to the...
  16. 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...
  17. mauimart

    Hub Motor as a Generator

    Here is a system I put together. It consists of a cheap rear hub motor connected to a 3-phase rectifier which in turn feeds a DC/DC converter. It will do 300W if the rider is up to it. https://endless-sphere.com/forums/viewtopic.php?f=3&t=56895
  18. mauimart

    JP spot-welder, FET-switched, timed adj. pulse

    It's my own creation based on what others have done here on the forum. Basically the same design as JP with an added user interface that allows me to select and view weld pulse times. I also have a counter that keeps track of the number of welds. I thought of adding a bit more functionality...
  19. mauimart

    JP spot-welder, FET-switched, timed adj. pulse

    In regards to the electrodes sticking I have found that High Strength 182 copper works better than some of the other copper alloys. It's specifically designed for resistance welding. I got some 1/8" rod from McMaster. http://www.mcmaster.com/#catalog/122/3802/=11gefmk. I filed the tips into...
  20. mauimart

    arduino speedometer

    Use a hall sensor instead of a reed switch. I have created Arduino based speedometers and tachometers. For the tachometers I simply mount a hall sensor outside of the outrunner can. You could just as easily mount a magnet to your wheel and have the hall sensor pick up on that. In the video...
  21. mauimart

    RC Mid drive project - trial/freeride style

    The fan you see on the C80100 is installed on my bike. The cooling results were better than expected, greater than 20 C reduction on a specific ride. See http://endless-sphere.com/forums/viewtopic.php?f=30&t=44287 for more data and graphs on the motor and the cooling provided by the...
  22. mauimart

    MXUS 3000 Hub Motor - V1 V2 V3

    I too am installing the MXUS into a Big Hit with 24" wheel. I am not using the stock rim but an Alienation Blacksheep 24" rim. It's laced such that the rim is directly centered on the hub (no offset) and this also puts the tire very close to dead center within the swing arm. The dropout width...
  23. mauimart

    The wheel-building spoke-lacing thread, post your tips

    I ended up drilling new holes, 3mm diameter, countersunk, at 20mm on center to lace up my 24" rim with MXUS 3000 motor. Spokes are Sapim 13 gauge by 135mm but could have been 2mm shorter. I think they ended up being longer than what the spoke calculator specified because I laced them with the...
  24. mauimart

    The wheel-building spoke-lacing thread, post your tips

    How does this look? Paired hole spacing at 20mm. Not sure what the hole diameter should be for 13/14 butted so I just entered 3mm. Drilling template is shown below.
  25. mauimart

    The wheel-building spoke-lacing thread, post your tips

    I am looking for some advice on my first wheel build. It's a MXUS 3000 hub motor and an Alienation Blacksheep 24" rim (http://shop.alienationbmx.com/black-sheep.html). I have run the spoke length calculations for both 0-cross and 1-cross pattern using the Grin spoke calculator. The hub spoke...
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