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  1. B

    Rare earths alternative in magnets

    https://www.cam.ac.uk/research/news/new-approach-to-cosmic-magnet-manufacturing-could-reduce-reliance-on-rare-earths-in-low-carbon Now that is interesting. https://onlinelibrary.wiley.com/doi/full/10.1002/advs.202204315 While the hard-magnetic properties of tetrataenite are attractive, those...
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    Side mounted solar panels output.

    I'm planning a fairing that might have place on sides for a couple of 100w panels. Will it be worth it though? Anyone tried that?
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    (tail)Fairings again, with !!science!!.

    Both human power and typical electric motors (or I should say - batteries less than that of Tesla) benefit a lot from aerodynamic efficiency. A road bike-like 'tucked in position' is not terribly effective and uncomfortable. A fully recumbent position is effective and comfortable, but...
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    Question to frame builders.

    Do twin spar/trellis frame make sense in case of a lack of stressed motor member? As I understand, you don't want a battery box to be a stressed member. Obviously monocoque would be best, but a bit complex, ahem. My goal is rather... unorthodox to be frank...
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    A test mule with virtual pivot steering

    I've tried creating a very interesting contraption - a virtual pivot steering bike with no had tube (the forks are something to attach bars to), virtually zero 'trail' in 0 deg handlebar position but greatly increasing positive trail when bars are deflected. Zero flop... basically XYZ cargo bike...
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    Fairings, CG/CP, pneumatic trail and other handling esoterica

    Yea, this is mostly about trying to design a more or less fully faired bike - as in singletrack e-assisted HPV that has efficient fairing AND with stable handling in side winds. My goal is to design (or at least try to...) a single-track bike that is more or less 'aerodynamically stable' given...
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    Centrifugal clutch for intermittent assist, *regen* capable motor?

    I know people have built centrifugal clutch equipped bikes in the the past, to overcome 'sensorless start' issues with some fine electric motors like astro, and they are otherwise useless on electric motors. However, I want a system that can isolate a motor from transmission, be reasonably...
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    LWB recumbent for long trips.

    It took on enough shape that I think it merits a thread. It it a platform to be fully faired, hence some rather unconventional designs choices, like low-trail geometry, steering damper, semi-low seating and LWB form-factor - all according to theory that too much trail and too forward a CP does...
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    Friction *regen brake* sanity check

    Based on this excellent thread: https://endless-sphere.com/forums/viewtopic.php?f=31&t=86961 It is clear that torque exerted by the motor on 'swingarm' makes it press into the tire and provide ample engagement, but it would be impossible to use as a dedicated regen brake. So, if I am to use a...
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    Series connecting dissimilar battery packs.

    I want to build a velomobile for long trips. Currently, I have 7s 80Ah 'main' battery and after a bit of a fiasco with a 200kv motor I'm contemplating a 130kv motor - but to reach desired RPM more voltage will be required. I contemplate getting an extra 3s ~90Ah auxiliary battery. Each will...
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    "Chain Puller" mid drive from industrial BLDC motor

    The HPV to be 'electified' is a DIY velomobile intended for long distance travel. I want a relatively low-power (about 150watts) efficient mid-drive that will integrate into transmission exactly like e-assist of Tetz: http://www.recumbents.com/mars/tetz/E-Assist.htm I've bought this motor...
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