Had a few instances today where I would lose control mid flight. One time there was a visible RX Loss warning in the OSD as I loss control. Two other times losing control resulted in a slow flip, but there was no RX Loss warning. Luckily all times nothing was damaged because I was low to the ground.
Strangely, looking at the DVR footage, when the RX Loss warning pops up, the rssi on my osd still says 90+dbi. Here are a couple theories of what is going on. I am flying the HQ durable 6x4.5 props on Cobra 2204s. These props are actually really durable (haven't broke one yet), but they bend. I suspect one or two props are bent out of alignment and are causing bad vibes. Either the vibes or the FC trying to filter out the vibes is causing the CPU to lock up and me to lose control. Another idea is that with the out of balance props, one motor is drawing too many amps and an ESC is going into protection mode. That doesn't explain why somethings the loss of control leaves the quad still in level flight. The RX is built into the FC (FrSky XSRF3O) so its not a receiver wire coming loose.
Worth noting that last weekend I was flying a different quad at the same location and it lost receiver connection once during a flight. There are 4+ of us flying FrSky in the same spot, but I think the protocol is good enough to avoid any interference. There is also a radio tower just up the hill from out flying spot, but it has not been an issue before.
So to summarize I think it is the FC CPU locking up from bad vibes, or an ESC shutting down.
Let me know what you guys think it is. I have flown this quad dozens of times without issue.
Strangely, looking at the DVR footage, when the RX Loss warning pops up, the rssi on my osd still says 90+dbi. Here are a couple theories of what is going on. I am flying the HQ durable 6x4.5 props on Cobra 2204s. These props are actually really durable (haven't broke one yet), but they bend. I suspect one or two props are bent out of alignment and are causing bad vibes. Either the vibes or the FC trying to filter out the vibes is causing the CPU to lock up and me to lose control. Another idea is that with the out of balance props, one motor is drawing too many amps and an ESC is going into protection mode. That doesn't explain why somethings the loss of control leaves the quad still in level flight. The RX is built into the FC (FrSky XSRF3O) so its not a receiver wire coming loose.
Worth noting that last weekend I was flying a different quad at the same location and it lost receiver connection once during a flight. There are 4+ of us flying FrSky in the same spot, but I think the protocol is good enough to avoid any interference. There is also a radio tower just up the hill from out flying spot, but it has not been an issue before.
So to summarize I think it is the FC CPU locking up from bad vibes, or an ESC shutting down.
Let me know what you guys think it is. I have flown this quad dozens of times without issue.