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Mountain bikes have even less indicators, but people can still judge the speed they need for jumps reasonably well.
one reduction stage (two gears)
four bearings (two on rotor and two on counter shaft)
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The set of gears is straight-cut gears right? That’s where probably most of the noise comes from. Or is it actually the motor?
I was wondering too why your fan is so loud. Is this the final design of the fan? Does it run on constant speed all the time?
Sorry for all the question, but I‘m excited about the project and aeroacoustic is my research field.
The fan is high capacity to keep the coolant temperature low. Lower temperature equals lower copper losses and lower IGBT losses.
Normally the fan won't run when the coolant is cool. For the media event we used the fan as a "bike on" indicator. I am sure that if we did not do that we would have had some "inadvertent acceleration" accidents.
BTW, you can run the fan (and coolant pump) during charging. The idea is that if you want, the motor and coolant will be practically at ambient temperature when you start.
Ok cool! Helical gears are a bit quieter than straight ones.
So you're aiming for 60 degrees max on the motor or even lower?
The battery temperature will fluctuate quite a bit riding in summer or winter. The battery concept looks like there's probably eough surface to keep the temperature close to ambient temperature at hot days, but what about riding in the cold? Is there a danger of getting the cells too cold?
One issue raised by media test riders was, panic reving in the air, causes the rear wheel to accelerate to the bike's maximum speed, not a rev limit, like an ICE bike.
This could be an issue for novice riders, causing them to loop out.
It should be possible to measure the bike's attitude, level, front high by 10°, 20°, etc and limit motor speed when the front wheel gets too high.
https://youtu.be/j3Cn7slInGo
Don’t know if the gif works, but it shows the automated assembly of the battery pack.
Think of it like switching bikes with your buds or your kids, 450, 350, 250 4t, 250 2t, 125.
You’ll figure out how to jump it quickly. It’s your brain that knows the speed needed.
Took 3 laps at a demo day on an Alta to get used to it. Next 5 times out, no problems.
Can’t wait to demo a Stark Ranks real high on my V2 things to buy. More than likely bonus time 2024 if available.
Curious, if they also manufacture the motor and the power electronics themselves.
Pit Row
Word from England is that full immersion in dielectric fluid battery cooling is being tested on a high powered E bike because of massive overheating issues for medium to high duty at the motors rated power.
Only flat devices like phones and laptops use pouches.
With the way Stark designed the battery pack, they‘ll have a high heat flow rate from the cells to walls of the housing. Cooling shouldn’t be a problem.
Stark have tacitly acknowledged they have battery over heating issues by limiting the ride times and loads when the writers were given those ride impression. There has been zero independent assessment, let alone the sort of extended tests the print publications have run with new bikes.
Strangely, Stark was touting their magnesium battery case. Magnesium is a poor heat conductor compared to aluminium
Did they? If read and watched a lot of tests and havn't heard of a overheating issue. Where did you find that?
Poor heat conductor? It's great heat conducter, just not as great as Al, but much better than steel or Ti for that matter.
It also highly depends on the alloy they're using. The thermal conductivity of alloys is usually a lot lower than of pure metals. Pure Mg has around 70% of the thermal conductivity of pure Al, but some Al-alloys have only 35% of the thermal conductivity of pure Al. So without knowing the Mg-alloy this is speculation.
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