Honestly, I don’t think more cooling is really needed. Will do more tests, but I feel comfortable rating these at 1500 watts con, and 2500 watts burst without heat issues.
I was doing 1500 con in the one video I posted a while back on that long 6 block fairly steep hill, that I did 3 times back to back with no breaks. Just up and down as fast as possible (still did over 25 mph up that steep hill). The old motors would have been over 250 F by then. On the first go, they got up to 145 F, second 150 F, and third go, still 150 F. Everything in these motors are rated to 300 F or higher besides the bearings. But opening these motors are so easy now that you need a few basic, cheap tools now to replace the big bearing, some of which any DIYer would have. These are no doubt the easiest hub motors on the market to service. Theres really no wasting any parts anymore. They can be 100% fixed if you manage to some how break them, haha.
Bear in mind, this was my wind, which had a .060 resistance. Hummies wind, which is these, have a .030 resistance, which simply means way less heat. This also has about 30% more copper than my wind (by weight), so these are going to stay cool under pretty much every circumstance.
This is meant to be an elite design already. We will continue to improve where we can over the coming years. But these motors already have so much attention to detail already. All of the other hubs I’ve seen have thin bells. You want more metal rather then less behind the magnets. These guys are heavy, fully assembled, about 5 lb per motor before trucks. But they are robust, durable, easily serviceable, and very powerful motors that are designed, hand wound, and assembled in San Francisco with a lot of attention to detail.
The last piece of the puzzle is the core/wheel right now, which we feel confident will be solved in the coming days. We have everything we need to make them happen, just getting these darn cans open is not easy, haha. In the mean time, more motors are coming together.
More magnets have been shipped, about 2 weeks out. In the mean time, winding and pressing! I can knock the all of bells out in about a week once the magnets arrive. The winding and pressing should be almost done by then!