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Cylindrical seem the best for this application
The more durable the better
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Magnesium for the battery case has inferior heat properties, corrosion issues and is much more expensive.
It's just another half baked aspect of this 2bike.
So you say the Honda/Mugen electric bike, that been shown a few times, never been ridden by anyone, uses battery cells that you can’t buy… interesting. Which „others“ do you mean?
Come on guys, what are talking about here? How many cars and bikes have Mg covers, engine parts, hubs or even wheels without problems.
I‘m sounding like I‘m an employee of Stark… I just can’t stand when guys like Gungadin throw random stuff into this thread, like his hex cells, and claim that the engineers made bad choices and give no further reasons. I get it, some of the stuff is just trolling. If they’ve used an Al casing, he’d say Al is too heavy and they should’ve used Mg…
From what if seen so far, Stark has hired very capable people, that know what they are doing. I think it’s a fine piece of engineering and that the big four will have to play catch-up for a few years.
It is also strange choice of material being inflammable- admittedly usually only when finely divided.
The hex cells I believe are made by Panasonic and used in Honda E cars, I'll get back to you about others.
The problem with the Stark and it's engineering credibility remains that among others there has been no independent testing and examination of the bikes with regard to power, duty cycle and range . All that has happened is 3 or 5 or 5 prototype somethings were ridden for very brief impressions.
Remember, this is for a machine being touted as the best (and most expensive) MX bike in the world.
So pardon me wondering about stuff.
Also what about my questions: which other brands use hex cells? Does the Mugen/Honda really have hex cells? Why are hex cells so much better than cylindrical cell, when cylindrical cell only waste 9% of the available space?
Yeah, they had only prototypes and are a few months behind schedule. However, they even provided all the 450s from the other brands for back to back testing. Of course there are doubt if the range they claim will be there when they will be delivered. But that’s with all electric vehicles or gas mileage claims.
Would be cool, if you could supply a link to the hex cells. I can’t find them, but would like to see what they‘re up to.
Stark photo. Cylindrical.
They could split it to packs of 100, 80 or 50 cells which would result in about 370 V, 296 V or 185 V, respectively.
Teslas battery packs run somewhere between 350 and 400 V, depending on the model and battery size.
Pit Row
So at full throttle they draw about 15 kW from each of the 4 separate battery packs, which would mean that each cell runs at a max current of 37.5 A. That’s right around the max continuous discharge rate of a lot of the high power 21700 cells.
Kinda funny how simple it is to run the numbers with these electric powertrains. From your snapshot we could figure out the basic numbers of the battery, of the motor with the ratio of the primary drive as well as that they use IGBTs.
Kinda Non-Moto, but if you want to see what the Rimac guys can do, who did a lot of the engineering on the Varg, watch this video. Here's F1 Champ Nico Rosberg driving his new 2000 HP Rimac Nevera. Also interesting when they are talking about other hypercars and the projects Rimac was part of. I'm impressed by Mate Rimac.
https://youtu.be/aN64wMLyCuY
How much energy do you reckon it takes to produce the aluminium in your bike? Total energy cost is about 200MJ per kg.
BTW steel is about 8-10 times less than aluminium.
The world doesn’t move forward at the hands of people who sit back and rattle off a long list of reasons why something can’t be done.
1. Most people would have logically assumed the “no maintenance” claim applied to the engine, and many would know that in reality there’s always something even if minor.
2. Range. Yes a genuine concern. Appears to be adequate for at least one dirtbike discipline- short course racing like MX/SX.
3. Cost. So he’d buy one at $12K but $15K and then make a point about the cost of bikes? That’s only a 25% difference. Maybe critical to some but it won’t be a barrier for many. Oh and I’m still waiting for the end of this 25 year long death spiral we’re in since four strokes came back to prominence.
4. Bit going on here. I’d bet all those generators burn gas more efficiently than if it was in a bike. If anyone is operating a gold mine that requires moving thousands of tonnes of dirt to produce one ounce of gold they’re either complete fools or not in business for very long. Recycling battery waste is a genuine concern.
5. Getting harder to follow. Can’t make much sense of most of this except to say that the people who paid millions for their acreage probably have enough $$$ to fork out for an electric dirtbike (and most likely have friends in the same boat).
6. Yes a lot of startups fail but not all. Everything you touch is produced by a company that was once a startup. Not sure of the point here.
7. Yes, every generation complains that the next is going to be worse off because technology has made their lives easier. That argument has been going on for hundreds of years. Also I agree with the original comment about noise at races (or lack thereof). I don’t think it will be the death knell of MX/SX. Plenty of atmosphere at ball sports stadiums but the play itself is silent.
8. Charging infrastructure will come. Like it’s doing for passenger vehicles.
9. Ok now we are really going off the rails. I honestly can’t make a connection between anything here and an electric motocross bike.
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