Electric Bikes

[Coby]

And how good the fuel economy is depends on what speed you are doing. Do 60mph is 1st & it will not be as good as 60mph in 6th....
Same with a EV.... Which if you draft them, has exactly the same effect.



Sorry, what does "draft them" mean exactly?

Fuel consumption of an ICE is dependent upon how far you have the throttle open!
Therefore if you spent all day riding around in top gear, you would have to have the throttle on the stop trying to pull away/accelerate and therefore consumption would inevitably be 'diabolical'.

[Coby]

Star delta starters went with the dinosours. We have proper control of motors with inverter drives now. Technology moves on...


Andy[/quote]


Referring to a star & delta starter, along with 3 x Types of circuit breaker was just an easily understandable way of emphasizing just how high the current requirements are of accelerating an electric motor.

How would you start a 'heavy' electric motor these days?
From what I have read, inverter drives only control the speed of 'small' electric motors.

[iooi]

[Coby]

You must have a very strange bike if you need throttle to the stop to stay in top gear....
You never mentioned stopping or starting
But even so, you do not need throttle to stop to pull away. You need careful clutch control

https://en.wikipedia.org/wiki/Drafting_(aerodynamics)

Still not answered Nobby either...[/quote]


By throttle on the stop; I meant - 'as far as it will go'.
Yes you will need good clutch control to pull away in top; and you will use an awful lot of fuel.

Can't see this question from Nobby I'm afraid, to what are you referring?

Of what relevance is 'drafting' to the conversation?

[Riejufixing]

Please sort out your quoting. You need opensquarebracket quote="name" closesquarebracket BEFORE what you are quoting.

It's usually easier to use "Quote" for what you are replying to, and edit the text if necessary.

HTH.

[Easy-X]

Regarding gears and gearboxes, let's make it clear what we're talking about: electric motors may utilise gears if they spin at too high or two low a speed to match road velocities.

I only know eBikes, apologies, but you either have small wheel hub motors that have a planetary gear stashed away in the case or direct hub motors that are much, much larger and have no gears at all.

So gears, if present are fixed. Let's just lump these together as "final drive."

Gearboxes imply selectable ratios where the user must judge the engine speed and the road speed and make allowances for deficiencies in the former. The main deficiency in ICEs being where you are on the torque curve. As electric motors have no curve there's no outside intervention required hence no gearbox.

There is a "Third Way" for eBikes and that's mid drive that goes through the main crank. Ask anyone with a Bafang BBS-HD and they'll say they might use gears occasionally but 80% of the time they're just in top gear. And TBH dropping down a gear on a particularly tricky hill is more to overcome the limitations of everything after the electric motor (i.e. the inefficiency of dumping power at the main crank.)

Having said that the main problem with direct drive wheel hub motors is you're contributing to unsprung weight in quite a big way so when you step from the world of eBikes to eMotorbikes you'll only see hub motors on the cheap, shitty 125 replacements. Any decent bike will have the motor in the frame driving a chain, belt or shaft to the back wheel.
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Coby]

OK, just watched a video on you tube concerning this subject, but the guy seemed to be concentrating pretty much on formula E sprint racing.
Where I believe they have to stop half way through to change cars!

Therefore speaking as an electrician, all I'm still seeing is a finite, in fact very limited, ELV power source, trying to supply a dirty great electric motor that is stuck in forth gear.

Doesn't seem logical!

[andy-b2]

[Easy-X]

[Coby]

Apparently we're increasing voltage in order to reduce current demands on the battery as we accelerate, therefore no need for a mechanical gearbox!

(Basically in the same way that a 'Star & Delta' starter used to).

Simple eh!

[Nobby the Bastard]

What do Tesla do? Do teslas have gearboxes? They are the premier manufacturer of electric vehicles built by the man who has built rockets that land on a sixpence on their rails.


This is something that NASA hasn't ever achieved.

I bet they don't.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Sprint ST 1050

[martin734]

[Coby]

Just to buck the trend, Porsche are using a two speed mechanical transmission on their Taycan!

[Coby]

Porsche have also decided to go for an 800v set up!

[Easy-X]

Edge cases - always worth bringing up in discussion
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[linuxyeti]

[TravisBickle]

[TravisBickle]

[TravisBickle]

[Easy-X]

People tend to shout "sock" when the account keeps banging the same drum with seemingly no reaction to either insult or sense.
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Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Coby]

I see the Police have started using electric bikes so that they can sneak up on people!

They seem to think that they're "capable" off road!

[Coby]

Man, you gotta luv Kawasaki!


And don't forget Porsche.

[Kawasaki Jimbo]

[Polarbear]

[Kawasaki Jimbo]

The Porsche electric 2-speed example is only because they wanted to extend the Taycan's top speed from 125 mph to 162. Efficiency won't be improved. No lessons to learn there for motorcycles with smaller batteries and thus more limited range.