I'm as close to an ebike expert as one can be without being one. This is tangential. Ask me questions if you have any.
A guide to building a fast electric skateboard at home
51–60 of 100 posts
Re: A guide to building a fast electric skateboard at home
#52If I'm going 50km/h on something, I would at least like it to have proper disk brakes like mid-range and higher bicycles do. Going at those speeds may be fun and all, but you're 1 careless driver away from the hospital, unless you ride on abandoned roads.
Yeah, lack of brakes on a 50 km/h vehicle is a problem. And in the case of skateboards, lack of handlebars too. That said, disks aren't essential for good bicycle stopping performance. Good rim brakes (like most mid or high end road bicycles) stop just as quickly as disk brakes in dry conditions . Rim brakes are not really an option for long boards, though.
Why not rim brakes, or disc brakes for that matter? Other than lock up which you can control. And why do you need that over e brakes?
Re: A guide to building a fast electric skateboard at home
#53Cool build!
My issue with the powered boards is that the motor is both engine and brake - they don't coast when you let off the throttle. With a longboard, coasting is all the fun!
I suppose it would be possible to modify the linkage between motor and wheels to be one way (drive) only? Kind of like a freewheel on a bicycle?
Re: A guide to building a fast electric skateboard at home
#54Cool build! My issue with the powered boards is that the motor is both engine and brake - they don't coast when you let off the throttle. With a longboard, coasting is all the fun! I suppose it would be possible to modify the linkage between motor and wheels to be one way (drive) only? Kind of like a freewheel on a bicycle?
Thats purely an implementation issue, it's called "Drag". It can be turned off (in theory) for safety reasons though it's probably not ideal to turn it off.
Re: A guide to building a fast electric skateboard at home
#5550km/h is suicide. ps: anybody here owns a gyrowheel ?
No it isn't. The world record is 146.73 km/h (91.17 mph) by Peter Connolly [0]. While most skateboarders never go that fast, downhill racers routeinly hit very high speeds [1]. [0]: http://www.guinnessworldrecords.com/news/2018/2/watch-this-s... [1]: https://en.wikipedia.org/wiki/Longboarding#Downhill
And racecar drivers go really fast as well, but that doesn't mean that normal people can safely drive that fast.
Re: A guide to building a fast electric skateboard at home
#56> "I have tried Li-ion batteries like Panasonic NCR18650B, LG He4, none are not as good as a cheape Li-po batteries you can get from Ebay. " that's scary as hell considering the battery is likely to take physical abuse. Look at the number of fire incidents caused by drone LiPo charging. There's a reason why serious drone enthusiasts charge their batteries in special battery bags.
I think part of the problem is that people just don't know any better. A battery is just a battery, like any other battery. They don't know that there are different chemistries and physical properties at work.
Re: A guide to building a fast electric skateboard at home
#57A known path, say that multi use path, you can work up to 50 km/h, but on streets. strange walks etc, you would soon go beyond your ability to react - been there, fell then, on roller blades at a far lower speed.
Yeah, brakes are a good thing for safety.
The ESCs listed in the posted page actually have brakes. I have one of the ESCs on my board and the brakes are strong enough that they'll toss you off the board if you don't take some time to learn them.
Re: A guide to building a fast electric skateboard at home
#58> "I have tried Li-ion batteries like Panasonic NCR18650B, LG He4, none are not as good as a cheape Li-po batteries you can get from Ebay. " that's scary as hell considering the battery is likely to take physical abuse. Look at the number of fire incidents caused by drone LiPo charging. There's a reason why serious drone enthusiasts charge their batteries in special battery bags.
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Re: A guide to building a fast electric skateboard at home
#59Hey, hit a curb at full speed and learn how to run at 50km/h in 1/2 a second
More like slide or roll, I think.
I've never been much of a skater. But I've always preferred sliding on my side/butt to flopping around.
Re: A guide to building a fast electric skateboard at home
#60Very cool but the original board was never designed to go at such speeds. I suspect you'll ruin the wheels fairly quickly, not to mention you might lose control at high speed fairly fast. I'm not a skateboarder myself, but I've moded some bikes and adding speed is the easiest part, making it useful speed is way harder. Also, I hope the engine can go in reverse or this guy has no breaking power; and as he gets comfort…
Regular longboards go much faster than an electric one like those described here. I recently built an electric skateboard using one of the ESCs in this post and on flat ground it can't go much over 20mph. It goes far faster than that on even a slight slope. Maintaining control at that speed is dependent on the trucks.
The ESCs do have brakes. They make downhills easy to manage. The only problem is that, without some special components, the brakes don't function on a 100% full charge. (The brakes are regenerative, so the ESC watches the voltage and doesn't allow the motors to overcharge the batteries.) That's not a problem in 99% of cases -- it only matters if you start your trip on a large downhill.
That said, anyone learning to ride an electric skateboard should learn how to bail. You'll have to do it eventually.