Recent content by dirty_d

I think this is a common misconception. Rewinding a motor doesn't change its mechanical characteristics, that is, it's torque/speed relationship at a given output power. A motor's mechanical characteristics are determined by it's size, shape, magnet strength, and copper fill percentage. Changing...

I guess this is a good first step. I think I'll worry about learning how to ride behind a boat before I start thinking too hard of about the electric propulsion.

I think if you really wanted to try this with the torqeedo prop, you could by flashing a custom firmware to the ESC. It's definitely possible to run a motor sensorless like that. The ESC by default just isn't expecting the motor to accelerate so slowly.

Is this one of you? https://www.youtube.com/watch?v=D-zdHYI_ZkI I have that same motor just laying around unused, hmm...

https://www.youtube.com/watch?v=uSudkID3zJM :lol: :lol: :lol:

NolaDoogie, they almost certainly do based on the size of the propeller compared to the size of the motor housing. I really think the best way of doing this is the same as pacificmiester did. An inrunner and inline gearbox gives you a slender drive that minimizes drag, and it lets you use a...

I like the idea of using something like this https://www.mhz-watercraft.com/shop/en/motors/449/motor-sss-56104?c=110 direct drive to something like one of those 52mm impellers https://www.mhz-watercraft.com/shop/en/jets/504/spare-impeller-jet-52-52mm-diameter-spare-part?c=110. Cooling an...

I've been toying with the idea of making one of these. I've ordered a kit from http://www.clearwaterfoils.com/ already. I'm going to just use it as a wake foil behind a boat for now. The thing that's holding me back from making an electric one is the gearbox. Even the one that pacificmeister...

As far as your current limiting goes, it might be more complicated than it needs to be and not react fast enough to save the FETs from frying. Its ok to have the shunt between ground and the low side fets, because while the average voltage across it will be the average battery current, not motor...

I was working on a flight controller a while back. It used an STM32 Arm microcontroller eval board. I was having stability problems the last time I was working on it, so I just ended up getting the KK so I could finally just fly the damn thing :) I admit it is kinda intimidating to fly knowing...

I did some research and ended up getting the ImmersionRC Uno5800, the 600mW transmitter, and cloverleaf antennas. I found some tests online that measured the actual power output at around 750mW. I was stuck between that and the Boscam TS352 or TS353 with the RC832 receiver. Those both tested...

Testing out how it flies with a load, maybe 4 pounds. Nowhere near the full payload capacity. I have the KK2.1 throttle scaled to 75% and was hovering at around 50% throttle on the transmitter. It's a lot more stable than I thought it would be...

It felt really stable, maybe because of the size. I've never flown a quadcopter before, and I didn't even realize that auto-level was off the entire time. What is 42Hz filtered? The output to the ESCs?

I finally got around to flashing the simonk firmware to the ESCs, I went ahead and bought a KK2.1 controller as well. It works pretty damn well. https://www.youtube.com/watch?v=XlMyax9dP8E https://www.youtube.com/watch?v=wzRT8luIYk4

I've been real lazy since getting back from Vegas. I need to get this thing outside one of these days and get it tuned right.