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the video is a promotional advert for Gazelle.

I may be able to help but it really depends on the donor bike.

the throttle controls directly the current/power to the wheel. No but pedaling always helps reduce battery use. Yes, a bit. The assist level sets the amount of max current and keep current. When the pedal sensor starts the motor, the current rises until the max level then reduces to the keep...

that's the lowest estimate. It's more like 37 billions worth of tax by the time to add Scotland, Wales, NI and social care increases. There is no brexit dividend, not now, not in 5, 10 or 15 years. If the economy gets hit by a no deal brexit, it will be even worse.

that DD motors are pantz for 15mph assist jobs and climbing hills.

This topic should really be discussed elsewhere. I am not convinced that there is any benefit using ferritic fluid in geared hubs. There are good reasons why people who use DD motors are looking for coolant. Overheating is a real problem for those motors made worse by the low rotor RPM and high...

no, it doesn't. 1ml = 1cm3 1cm3 / 50cm2 = 0.02cm = 0.2mm Your airgap is about 2mm. 10 times the thickness of the oil film.

The air inside the motor is not still, it is in a forced convection. For a good approximation, instead of using the still atmospheric air conductance, you need to add the heat transfer due to laminar flow which is 10-100 times more than still air. Let me give you some numbers to nail that sales...

same situation with geared hub, with typical 5x reduction ratio. That's why the risk is 5x less than a direct drive motor.

sure. I have the 48V SWX02 kit for that.

you can always put your theory to test one of these days. The capacity of cooling is down to the design of the motor's casing, not influenced by the added thermal fluid, whether magnetic or not. It's just like your house radiator. You can use circulating water with or without additives, it's not...

it's just a theoretical risk. 10% gradient climbing at maximum power for 5 miles is 800m vertical, not likely found in the UK. Realistically, have you come across any geared hub that died of overheating? Very unlikely. Magnetic fluid has its use but not in ordinary e-bikes otherwise Bosch would...

BBS kits are reasonably tidy, my hub kits are a little tidier still. They'll look like this when the OP has time to tidy his wiring: or like this: or like this:

you can use XF07 to model the XF08C. They are similar enough. The motor can dissipate 150W OK, there is a considerable laminar flow of air around the motor. On some motors where the emulator has a heat dissipation model like 9Continent 2705 DD motor which in the same condition has a yield of...

the MXUS motor has an internal clutch and gearbox with nylon wheels. Do you still maintain that Paul should use coolant?

wonders never cease where brexit is concerned.

yes.

Paultr has an MXUS XF08C motor and a Lishui 17A controller. That kit does not need coolant.

James, because of your weight, you have to have better kits.

no need for coolant. You can ride for hours and your motor is not even warm. The geared hub motors do not suffer as much from overheating as direct drive motors because they are much more efficient at climbing hills compared to direct drive motors. Higher efficiency means much less energy is...