I have been working on this during the last two years by now, and it is time to stop hiding in a cabinet. It all started some years ago when I was commuting to work, and realized that my trip consisted of 20 minutes in a regional train, plus 10 minutes walking to get there from home, plus another 15 minutes from the train station to my work place. In total that was 50 minutes of walking every day. Buying a foldable bike was an option then, but they are quite heavy and bulky especially when you have to lift them on a stairway. A colleague recommended me to use a kick scooter, they are very light (down to 6kg) and foldable. Said and done, but after some time using it each and every day, my hips and knees started hurting more and more. I realized that this kind of exercise was good for my condition, but not for my bones. Next natural step: electrification of my scooter. As I am not a construction engineer, I decided to use an existing kick scooter model and upgrade it. My choice fell to this one: OXELO Town XL susp https://www.decathlon.de/city-roller-scooter-town-7-xl-mit-federung-chrome-id_8298992.html?gclid=CJfX7c2Z8tICFYYaGwodspUEQw With 100€ it is a bit pricey, but I it is very well designed and doesn't all apart after the first few 100 kilometers. It is fully suspended and it has a stable folding mechanism. It also has lowered board, which reduces the required leg work during riding. Because this is a quite popular model, there are almost identical Chinese copies of it, you can find them on ebay. They sell for roughly half the price. At the beginning I developed my electric conversion kit just for my private fun and use. I have been using the prototype model for more than a year now, and the first battery is still alive after countless kilometers. And I realized that it would be the same fun each and every time that I step on it for a ride, that feeling does not seem to degrade. I get a lot of interest and positive feedback from people almost every time I come to a stop. All this helped me make my decision: make this a commercial product, and sell it to other enthusiasts. That was when the kicksurfer project started. It was clear from the beginning that it would be a conversion kit for DIY'ers. It should be as simple to build as possible, and the price should be as low as possible. And, most importantly, it should be as convenient as possible. As simple as possible: apart from the scooter and the kit, you only need a cordless screwdriver, a set of metal drills, a ruler (if available: caliper), and a hacksaw (if available: multifunction rotary tool). Build time should be less than two hours, but that is yet to determined. As cheap as possible: targeted kit retail price (per lot of 100 kits) is 449 euros. This includes everything you need: motor, battery, controller, charger, all construction parts. As convenient as possible: - smart: no levers, no handles - the controller senses the driver's actions and reacts on that - standard mode: the driver kicks once, then the system permanently maintains the resulting speed - kick once, surf home - street-legal mode for Germany: works like a Pedelec by only boosting each and every foot kick from the driver - automatic brake detection: keeps down torque during braking and maintains speed thereafter - automatic startup and shutdown: no power switch - safe: driver detection ensures automatic torque cutoff when the driver steps off the scooter - intuitive: feels exactly like a regular kick scooter, but with any friction removed - speed: 2 to 20 km/h - range: 10km (to be verified) - charging time: 1.5 hours - weight: 8kg As of today, most parts of the kit are ready but there is some remaining work and money that I have to invest: - battery pack transport test per UN38.3 - plastic injection mold tool for battery/controller housing, currently it is a 3D printed part - much too costly - find and evaluate a suitable and safe charger, current model has CE mark on it but that is in fact [i]China Export[/i] - currently negotiations with two different manufacturers - create mass test tool for controller board (needle bed adapter) - add missing firmware features like configuration and firmware update via Bluetooth - create PC / smart phone apps - create step-by-step construction guide - draw public attention and get funding for first mass production lot Most recently I have set up a website for the project: https://www.kicksurfer.de It has just started and and I have to apologize that the main page is still empty. Both account management and blog system are running. If you are interested in this project, I would be happy if you would sign in for updates - I will regularly post updates in the blog section: https://www.kicksurfer.de/index.php/blog/ Latest post: https://www.kicksurfer.de/index.php/2017/03/25/board-rev-4-is-finished-ordered/
It's a joke, isn't it? Who on mother earth will pay 449 Euro for next to nothing? What do I do with 100 kits? Feed them to the dog?
: Restored by Moderator
Lockmann wrote: > It's a joke, isn't it? Who on mother earth will pay 449 Euro for > next to > nothing? What do I do with 100 kits? Feed them to the dog? That is the price per one kit, calculated from a production lot of 100 kits. But what do you mean by next to nothing? You get a set of battery, motor (brushless hub motor with attached tire), controller, charger, and mechanical parts. Of course I need to include something for my fixed cost here, just UN battery test plus injection mold tool is >10,000euros. I don't expect to make any money from the first 100' lot.
As your states: Nothing is ready to sell. I think that this forum is the wrong place to offer your good.
Codix wrote: > As your states: Nothing is ready to sell. > I think that this forum is the wrong place to offer your good. I was posting it to introduce my work, and to receive feedback and your thoughts about it, maybe recommendations. I didn't expect this kind of reaction.
what's the Maximum power Ratings of the driven Motor? Wich Controller do you intend to use? --- Oh. there is no Motor, sry about this...
Axel wrote: > what's the Maximum power Ratings of the driven Motor? Wich > Controller do > you intend to use? > > --- > > Oh. there is no Motor, sry about this... The kit will contain an 8'' 350W hub motor with integrated tyre. It directly replaces the rear wheel and is slim enough to fit into the wing. The controller is a custom development, have a look at my blog. It allows torque control and the firmware runs FOC which improves efficiency and makes the vehicle very silent. I am thinking of making it open source hardware, but making the firmware open source as well requires some substantial work that I would need help with. Currently the controller is manually adapted to a specific motor.
I just registered to this forum on my way to reach projects on kicksurfer.de My interest is - electronics and micro controller application projects such as projects presented here. Nice work in your projects. I view myself as a DIY love to follow, and to share, interesting ideas and results, especially innovative ones. First off, I ran into problem attempt to view your projects on kicksurfer.de My google based browser couldn't receive normal response at https://www.kicksurfer.de/ wondering there is something I have missed or not? Any help, direction is much appreciated.
YK C. wrote: > My google based browser couldn't receive normal response at > https://www.kicksurfer.de/ At the moment its down: http://downforeveryoneorjustme.com/www.kicksurfer.de