What does battery cutoff mean? Now I know. This had been a full 2-hour trip and voltage dropped pass 33.0V for the very first time, to something like 32.8V when I checked. When battery cutoff occurs, the motors still run but at a super slow speed. So slow that I just turned the power off and pushed my way home. The voltage ran back up a bit to 33.0V when I turned it back on at home These are the BLDC configurations of my DIY, except that I use FOC instead of BLDC as my motor type. FOC mode gives me a bit less startup torque but the motors are basically silent.
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The left rear wheel was coming off my DIY again after a 2-hour trip. (Voltage dropped from 41V to 33V, not too bad at all.) The silicone sealant I used just don't stick to metal as good as I wanted. It did hold onto it for a long while. It's not bad comparing to a previous brand of silicone sealant which slid right off the motor after drying. The (dark gray) silicone sealant did stick to (blue) rubber very well. The problem with this particular wheel is that the recess was bored way too deep, giving it space to slide out even with the end cap tightly secured. Filling the excessive recess with silicone sealant. Let's see how long this time the fix could last.
Belt drive systems (in BLDC mode) are so noisy that I can hardly wait to put my DIY back into action. I tear the wrapping up and turn it on. OMG, 40.9 volts! Dropped less than 1 volt over the winter! Good to go already!
There was only one fall in 2017 that I could not simply run out. That happened on July 25th. It was an 1.5 hour ride and I was using a selfie stick for the first time. Max speed achieved was only 46.3 km/h as I was not used to holding a stick in my hand And perhaps because the left rear wheel had come loose and slid out a couple mm? (Note the gap between the wheel and the motor.) Anyway, the asphalt joint was wider than expected and I didn't slow down enough. I tried to cut an angle (through every joint) so that only one wheel would fall into the joint at any time. Since I was turning to cut this angle, I was not able to land right back on the deck after being thrown into the air. Here's how it happened. (The fall happened at 1:25 at a speed of 35km/h. Five seconds later, I was able to locate and retrieve my camera.) Not sure if it was because of my training many years ago in Judo, I surprised myself by doing a forward dive shoulder roll - I tucked my head and dived, rolling on the asphalt along my right hand, right elbow, right shoulder, and finally the right back side of my hip before standing right up side-way. (So cool that I wish I had captured it in video!) My G-Form elbow pad saved my elbow. However, it did not hold well in position while my elbow slid on the asphalt. My helmet barely touched the asphalt and suffered from minor scratches. In this particular instance, I would have been perfectly fine without the helmet. This gentlemen saw everything and not only did he tell me where my board went, he actually retrieved it for me. Saying farewell. Thank you so much! For better protection just in case I will fall at even higher speed, I bought this after the fall: Featuring both elbow and shoulder protection, this jacket has a big thick back armor plate for spine protection too.
Anyway, I will see you around in 2018 The E-Go was dead after riding through pools of water. Waterproofing from the outside was obviously not enough. Luckily, after turning the board upside down overnight has drained and dried the water out of the control unit compartment and the E-Go is alive again. It's high time to flood the inside with Nano Protech as well. The green batteries in blue jacket were surprisingly clean after 3 seasons of riding! E-Go has done a great job sealing the battery compartment. Not so for the Control Unit compartment!
Will this really water proof the board? We will see in 2018! |
DarrylTaking up longboarding... Archives
November 2018
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