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Attention: RC-CAM.com will be closing down August 2021.

The RC-Cam.com forum was the very first online community dedicated to the advancement of wireless video cameras on radio controlled (R/C) models. This is now called "FPV" (First Person View). We are proud of the contributions that our members have made to the FPV hobby.

We've seen significant changes over the last twenty years. Initially there were a lot of eager R/C hobbyist that built their own video systems. Allowing these creative individuals to share their work was the purpose of this site. Now the FPV market is flooded with low cost systems; Sadly DiY FPV video projects are now rarely discussed.

RC-CAM.com (main site and forum) will be closing down August 2021. This is being announced now (March 2021) so that everyone has time to download any information that is important to them. After the site is shutdown the information will no longer be available here.

We appreciate every member's involvement with advancing the FPV hobby. It is indeed sad to say goodbye to all our online friends. Be safe and stay healthy.

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Hi there.

Anyone out there using X500 or X600s (or anything else that doesn't use GPS), having loss of control problems at height?

The symptom is sudden loss of ability to recover back to a hover from forward/backwards/sideways slides i.e. you go into a big slide, and can't get out of it.

For a while I thought it was ESC overheating, but I no longer believe that to be the whole story: My original X500 would sometimes suddenly fall to one side, but suddenly at low altitude and lots (!), due to overheating of a single ESC on the side carrying the most weight.

This other - much smoother - slide has happened to me a few times, but only from quite high up.

I am wondering whether, since I'm measuring airspeed using local cues (trees, ground etc.), it's just that the higher I get, the harder it becomes to detect horizontal movement. True whether flying conventionally or FPV. And if your horizontal speed increases to the same sort of speed as your downwash - about 20 kmh I measure - you lose thrust through vector addition; the rotational moment you're using to correct the slide is reduced by the sideways movement below the amount necessary to correct the slide.

Anyway, my question to all you quad FPV-ers out there, has anyone had this 'unstoppable slide into the ground' problem when flying?

(Might just be me - I'm quite paranoid enough...)

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  • 1 month later...
my question to all you quad FPV-ers out there, has anyone had this 'unstoppable slide into the ground' problem when flying?

Probably not the exact same thing, but I've been bitten by an unexpected slide too. It is described here:

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