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It’s possible the tantalum was installed in reverse at the PCB assembly house, which is why it blew.
I’m a little confused about how you’re powering your receiver. Are you powering the AR610 directly from the battery? The battery is 4S, which means 16V. The receiver can only handle up to 9.6V, which means if you powered it directly from the battery, it most probably is fried. You should instead power the receiver via the 5V BEC on the tricopter frame.
As Frank said, the carbon fiber is lighter and looks cooler.
On the down side, carbon fiber does block radio signals, so just avoid placing your radio receiver directly above the carbon fiber plate and you should be ok.
Thanks Frank for the info, just placed my order for a new mini Tri kit 🙂
The reason I asked is that I have had to pay import tax in the past when buying commercial goods and having them shipped to a business address. USPS usually makes you pay the tax when you pick up the package at the post office, while UPS or FedEx usually makes you pay via their website before they’ll deliver the package. So I was just wondering if the same applied to buying from David and getting it shipped to a residential address. But I guess not, so yay!
I think the problem is that the ground pins are connected to a ground plane (i.e. large copper area) inside the tricopter board, while the signal and positive pins connect to thinner traces (I assume…). If this is the case, then when you heat the ground pin with the soldering iron, all the heat is being absorbed by the large ground plane.
To solve this, keep your soldering iron on the ground pins for a little longer (say extra 2 seconds) before applying the solder. Just don’t melt the plastic on the headers. This extra time should compensate for all the heat being conducted away to the ground plane.
If this doesn’t work, then you probably just need a more powerful (higher wattage) soldering iron.
I often need to balance my motors. I usually do this by sticking small squares of vinyl onto the side of the motor to get it to balance. The method is described here:
This has helped me reduce vibrations enormously in the past on other aircraft.
The wires from your battery to the tricopter look pretty long and thin to me. They therefore probably have a fairly high resistance. Are you sure that these wires aren’t the cause of your volt drop?
I would try with connecting the battery connector directly to the KK board and measuring the voltage there.