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    Arduino Virtual Flywheel Throttle controller

    I have another thread discussing Moto e-Trials design that's been going a few years. One of the key things that's been discussed at length there is that ICE trials bikes rely heavily on flywheel inertia and torque delivery characteristics for their performance. To date (Feb 2024) there have...
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    Any controllers capable of maintaining smooth RPM decay rate under suddenly varying load?

    I've been looking around for a controller that might be able to maintain a fixed RPM decay rate even as load varies. ie. from high RPM the throttle is closed, the motor should maintain a more or less constant RPM decay rate even if the load is totally removed then suddenly increased. Obviously...
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    Sensor vs Sensorless pros & cons

    I've read a variety of posts referring to sensorless controllers but have failed to identify any significant advantages or disadvantages other than: Pro No need for sensors. Duh Con Startup from stationary can be less than ideal. ie sometimes it wont, or it does but with reduced torque...
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    QS138 rewind for increased KV?

    A few days ago I posted asking if anyone knew of a Plettenberg Nova 10 alternative at reasonable cost (and obviously reduced specs - I'm not trying to get something for nothing). No responses so I'm thinking there's not much out there. So now I'm wondering if it's practical to rewind a QS138-70...
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    Plettenberg Nova 10 alternatives

    I'm looking for an inrunner in the 5-10kw peak (under 20sec) range, probably 3ish kW continuous, and capable of something in the realm of 7500+rpm on 48V. The Plettenberg looks about the mark, but obviously the price is a bit off-putting. I don't care that much about efficiency, and the size...
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    Australian RCM certified 58.8V 10A charger sources?

    I'm looking for a charger properly approved (not just a compliance mark randomly printed on a box!) to Australian RCM. 58.8V around the 10A area. Ideally it would be selectable between say 6 & 10A, but that's just a wish. I've seen a few at lower amperage, but nothing close to 10A so far. If...
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    China to UK bike delivery

    Is there anyone who can shed some light on the practicalities of getting an e-bike sent from China to the UK? I'm looking at a small electric motorcycle (1.5Kw continuous, 48v 20Ah lithium battery) that I'd like to get into the UK. To be clear, this does not have pedals and it is clearly...
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    Nucular Battery Charging clarification

    I've read a lot of posts covering aspects of the Nucular battery charging capability but have found it all a little scattered and for the less electronically adept (me) a little hard to extract the key take-home messages. I don't yet have a Nucular (12F on order) so perhaps some of this will...
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    Fat-e Trials Bike

    This thread is a spin off from Observed trials bike designing. That thread is around making the design decisions, this one will hopefully chronicle the build. This bike will be a modified full suspension fat bike, aimed at being a dedicated trials bike. Speed is definitely not a factor, torque...
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    Electronic clutch / inverted hall signal - assistance required

    I am just beginning a Fat Bike Trials conversion. I have a rudimentary understanding of electronics, but cannot design anything. What I would like to put together, as simply as possible, is a clutch lever that proportionally cancels the throttle signal. Nett effect should be that you can twist...
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    LMX 30mm / Cyclone 3Kw / QS 1000W 90 / 30mm AliExpress

    I am trying to finalise my choice of motor for my Fat Bike Trials machine and am after some knowledgeable input. I've narrowed it down to these three motors: LMX 30mm (2018/9 version, not the new one) - LMX say the difference between this old and the new is thinner windings, 0.5mm vs 0.35mm...
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    Observed trials bike designing

    I am looking into building a full size moto trials bike, using an existing IC bike rolling chassis. I'd like it to perform similarly to a modern 250 - 300cc 2-smoke trials bike. I currently ride a 2017 Beta 300 at bottom end of B-grade level. It will require a mechanical clutch (kind of...
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