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I don't mean to burst your bubble, but I think that dual motors makes the bike non-compliant with EU regulations.

Go troll somebody else.

Having already stated this multiple times, I couldn't agree more. DD motors are so much better suited for hot-rodding and those that do go this route, tend to want to eek out every last bit of performance. This is where FF + hubsinks shine - I think the phrase is "game changer". The other side...

You're forgetting that FF is magnetic and therefore forms columns between the stator and magnets. It bridges the air gap enough to have a dramatic effect on cooling. If you want greater bridging, use more FF. This will of course increase motor drag though. Also, FF suitable for this application...

Without even looking at your numbers, there's so much wrong with your general understanding of ferrofluid. Firstly, it does bridge the air gap - it is attracted directly to the magnets, that much is plain to see when it's applied. It has been calculated through prior testing and research that...

You show a fundamental misunderstanding about the role ferrofluid plays in hubmotor cooling. It's there purely to bridge the gap (displace the air) between the stator and motor casing, allowing faster heat transfer from where the heat is generated.

Apart from on a low power folder, I've all but given up with geared hubs. I wouldn't want to live with the mess of oil bath cooling anyway. Also, the downside of increased drag negates the advantage of them being able to freewheel. Sorry, that's just plain wrong. By far the greatest heat...

I've destroyed 3, all by overheating due to running too much power, although the failure modes were not all the same. I'm positive that none of them would've failed with oil cooling. This of course ignores all the downsides to oil cooling, which I think outweigh the benefits for most people...

I've never said that Paul (or anyone else for that matter) should use coolant. I do maintain that additional cooling will allow a motor run at greater power levels or loads than it was originally designed for, whatever the motor.

I certainly agree that a MXUS XF08C doesn't require additional cooling at 17A. That's not to say that it wouldn't still be beneficial in specific scenarios though. If you were to fill one with oil, you probably be able to reliably run it at 30A. What's not to like (apart from the inevitable...

Additional cooling of a motor is required when you want to push the power output past what can be sustained with natural cooling only. It is nonsense to state that any given motor type does or doesn't need it. If you want to eek the maximum performance out of any motor, it'll need additional...

Me too. A couple of small accessories and..... For my next build I'm going back to basics. Here's a preview:

As an interim solution, are you able to reprogram your controller to adjust the throttle input voltage range to match that of the faulty throttle?

The exit route almost impossible to stop is via the motor cables. Give it time and you'll find that oil wicks through the wires via capillary action. The lacquer won't stop the ferrofluid from working, but there has been anecdotal evidence to suggest that the base oil can react with some...

Don't get me wrong - oil cooling works a treat. It's just that the volume required is many orders of magnitude greater than required with ferrofluid and this creates unnecessary drag. Additionally, keeping the oil on the inside of the hub is a losing battle. Ferrofluid contains nanomagnetic...

You might want to put a hold on oil cooling and look into using ferrofluid instead. http://www.ebikes.ca/product-info/statorade.html

That's a fairly standard indicator/hazard circuit and looks totally fine to me.

I have to disagree. I've spent over £15,000 on AliExpress over the past year and have had an issue with 5 transactions - maybe £500 worth of purchases. For each case opened, I have been given at least an equal level of protection as I would receive from Ebay and have not been left out of pocket...

Cyclone kits are available from the following Greek reseller: http://www.turbobikekit.com/index.php?route=common/home Sent from my One Mini 2 using Tapatalk

AliExpress has accepted PayPal for a couple of months now. Sent from my One Mini 2 using Tapatalk