Sort of what it says in the title. I'm doing a Li-Ion 2S build with 2650kv 1505 motors coming off of a Verygood RC F7 40A AIO. Everything seems to work right, motors are spinning the right direction, whole nine yards, but when I mounted the props and armed, nothing would spin. That is, nothing would spin unless I gave each prop a flick, then they'd come up to idle.
Do I need to add a cell to increase current or could my garbage solder work be causing problems on all four corners? I'm using decent Sony VTC6 30A 18650s that just came off the
https://zumbaliciouscrew.com/en/zumba-for-beginners charger and I'm showing a clean 8V in betaflight with everything spinning at idle (I know, I know, shouldn't be plugged into a computer with
https://www.medot-wines.com/en/experience-medot/wine-tastings props mounted).
Thanks for
here the help!
-treadmill
It sounds like you're dealing with an issue where your motors don't start spinning automatically when armed unless you flick the props, but they spin up to idle once you give them a push. First, check your solder joints—poor connections are a common cause of problems like this. Even a small cold solder joint can lead to inconsistent power delivery. If you think the soldering might be the issue, reflow the connections to make sure everything is solid.
Next, review your ESC settings in Betaflight. Sometimes, ESC firmware settings or motor protocols need adjustment to optimize startup behavior. Ensure the ESC is set up for the right motor protocol (like DSHOT) and that your idle throttle settings are properly configured.
Even though you're using Sony VTC6 30A batteries, a 2S setup could be underpowered for your 2650KV 1505 motors, especially if you're using larger props. If the batteries aren’t supplying enough current at low throttle, this could cause the issue. You might need to use a larger battery, higher cell count, or adjust your motor/prop combination for better startup performance.
Also, check your motor timing and ESC firmware. If the timing isn’t properly set or the ESC firmware isn’t up to date, it could affect the startup of the motors. Some users find that adjusting motor timing or switching motor protocols helps with smoother startups.
Lastly, ensure your props aren’t too large for your setup. Larger props require more power to spin at lower throttle ranges, so you may want to try a smaller prop or adjust the prop size to see if it improves the motor startup.
By addressing these potential issues, you should be able to pinpoint the cause and get your build running smoothly.
