Hello, I did not update this thread for a while, here are the news & experiences:
The bike is up and running since November, but I did not use it in the winter. Until now I rode about 1000km.
Some data:
- weight is 56kg, a few kg-s more than I expected
- 29s1p, 15Ah Headway cells, 96V nominal, charged to 106V
- 42A battery current limit, just below the 3C continuous limit of the battery. The voltage drops to 85V at this current.
- 3.6kW battery output power, limited due to the battery
- just increased the phase current to 120A, until now it was set to 100A
- 70kph top speed (75kph when I lay on the handlebar..) with Schwalbe Crazy Bob. Slightly less with Kenda Nevegal offroad tires, maybe 65kph - not measured exactly yet.
I had to weld the rear shock mounting brackets to an upper position, more away from the pivot, because it was impossible to set the damping properly. Now it is much better, the leverage is around 2.7.
There was an issue with the spoke nipples in the rear wheel: some 4mm diameter nipples broke, possibly due to the bent spokes and the bad damping in the first times. Then I changed them to 5mm, they are ok now. The spokes are 13g, 4mm and 5mm nipples are available for this. Definitely a motorcycle rim, tires and spokes would be better for this weight and power, and also due to the large unsprung weight of the rear wheel.
Generally I'm happy with the bike (I just call it Star Destroyer
), but soon I'll start to fabricate a new, lower weight frame with more rounded corners that will hopefully look better
Some photos:
Display, controller and BMS with the firmwares are also my designs and builds, maybe I'll make some photos of the internals if I disassemble the bike the next time...