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  1. X2flier

    One failing cell

    I see some build-up battery enclosures being developed, and I really like the DIY 3D-printed concepts. I believe it is important for the average rider to be able to replace one failing cell, when the time comes. Since nobody seems to have a way to check for a bad cell without some disassembly...
  2. X2flier

    Electric Ultralight

    This is a Mike Sandlin GOAT, a homebuilt FAA-legal ultralight glider, with electric power added. In the USA, no license or inspections are needed for the pilot or the aircraft. Sandlin's Technical Drawings are complete, and free downloads. As a type, we call these ultralight gliders the...
  3. X2flier

    batteries with screw terminals?

    DNG here. I am trying to figure out a 48 Vdc battery pack for a proposed mid-drive build. I will need to maintain the battery pack, so welded packs are simply off the table. They may be wonderful indeed, but they are not user-maintainable, and I am not rich enough for multiple packs. Also, I...
  4. X2flier

    Successful ebike builds.

    I am not one for great complexity and the tiniest (costliest) improvements in efficiency. I want a decent ebike, but do not like what is offered commercially, at those rich-kid prices. I'm a DIY guy. We have here a great pool of knowledge, but sad to say, most new riders here will have a...
  5. X2flier

    wheel motors

    ES, I have been looking at the Kepler Friction Drive designs here. One little outrunner motor drives a bike at respectable speeds. There are no gears, and no wasted power. A light-bulb got illuminated, in my head. It's probably not an original idea, but given the size of hub motors now, I'd...
  6. X2flier

    crank freewheel dimensions?

    Hey, DNG here, and kinda lost. Found a few thousand older posts about crank freewheels, but nothing (yet) about physical sizes. I want to put a front crank freewheel into an old mountain bike. I need to know the dimensions of the industry-standard crank freewheels, if any. The most popular...
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