The older motors needed this adapter, or put on your own JST PH connector
3 Likes
Measure it?
1 Like
Polyester resin =/= epoxy.
Polyester resin is cheaper, but also stinkier and more of a pain to get to cure properly, which is likely the cause of your issue - the resin has interacted with the paint and not cured properly.
I highly recommend using epoxy resin over polyester, youāll have a better time.
5 Likes
Yes, precisely
2 Likes
Are direct drives in practice worse though?
With a 1:1 gearing, its about the least efficient setup anyones gonna have.
2 Likes
Direct drives can be quite powerful and efficient (For example my ebike motor routinely handles >2.5KW for extended periods and 5KW peaks without breaking a sweat, I think I calculated the max efficiency as better than 85%).
However they really struggle with cooling and power density. To reach those numbers, my ebike motor is over 9kg, or 20lbs. For a hub motor small enough to fit an esk8, thereās just not room for a big enough motor to handle high power levels.
Raising the kv lowers the winding resistance, which greatly reduces heat generation. Raising the kv means the motor has to spin faster, and the extra airflow velocity from spinning faster helps with cooling as well.
4 Likes
I Didnāt think it was that simple, but Iām sure you have much more experience with these simple things than I do sir.
1 Like
If it has a bunch of pins, measure across a few and divide to get a more accurate pitch measurement.
The chart on the Wikipedia article has the names for each different pitch (spacing)
4 Likes
Are trampa/kaly style decks safe at speed? ~200lbs at 40mph?
Something about those curvesā¦
How so? DD cuts out all the loss involved with a belt transferring power from motor to pulley. Thats why coasting on DD feels so damn good
Mechanically they are very efficient.
Electrically, much less to.
To get the KV low enough a hub motor needs many more turns of wire on each stator tooth, and also usually more stator teeth than a similar-sized non-hub motor. The longer thinner wire means the winding resistance ends up being much higher than a similar sized non-hub motor, and the power loss of a resistor at a given current increases linearly with the resistance.
On top of that, hub motors are much harder to cool:
The outer diameter, the largest surface through which heat could be lost, is covered in a thick layer of insulating polyurethane. Even on DD motors that arenāt in a sleeve, the lower RPM means less shear/turbulence in the air gap between the hot stator and the cooler shell, further reducing the heat transfer compared to a geared motor, and theyāre almost always totally sealed/enclosed so they canāt benefit from forced airflow through the motorās core.
Increased heat weakens magnets and causes the resistance of the coils to increase even more, in a vicious cycle that ends up with a paperweight.
All that to say, TLDR, hub and DD are great for stealthy, low power builds and they do have very low rolling resistance, but they struggle mightily with higher power. The harder you push them, the worse the drawbacks get.
4 Likes
No idea about 40 but i did 38 
Edit: 100kg, 17ply trampa
2 Likes
Are Trampa/Kaly style decks safe at speed? ~90kg at 64km/h?
No idea about 64, but [he] did 61
2 Likes
The stiff ones, yes. The flexy ones, no.
Source: owner of a stiff kaly, a soft kaly, and a medium trampa deck
3 Likes
This is an interesting new hobby youāve got Bri. Trying to convert the masses to a saner system of measurement is a laudable goal at the end of the day 
1 Like
Itās definitely not new 
I will convert to metric when appropriate so more folks can understand ā but I wonāt do the reverse conversions because FUB needs to fade away.
1 Like
Are Trampa/Kaly style decks safe at speed? ~14 stone at 34.6 knots?
No idea about 34.6, but x did almost 33
4 Likes
im pretty embarrased, iāve got wobble at low speed (20kmh) with my mtb and it make the ride uncomfortable, i have tried to harden the front bushing (apex truck) but if that stop my wobble problem that means i canāt turn anymore because its too tight.
maybe the slime didnāt help but i donāt know how wash it out of the tube.
So, iām thinking to put some E-toxx hubs but 1st question : is that solve my problem ? 2nd : someone have already install the e-toxx hubs on boardnamics A-T gears ?
1 Like