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strange noise from a spinning propeller and hexa going backward

Posted by x-air71 on July 1, 2012 at 11:00pm

Dear all, I've built an hexacopter with APM1, during my first flight I've realized the hexa was going backward, even if there were no wind at all, what could be? (I've done the level procedure)

Second issue, I've uploaded the latest firmware and had some problems in setting up the parameters...really much different from the one I had saved before.

How can I find the recomended parameters list for hexa with firmware 2.6?

As last, when giving throttle (50%), I hear a strange noise coming from one propeller/Motor, looks to me as a kind of cavitation noise...I changed the propeller thinking it was damaged...but it is still the same.

Any idea?

 

Thanks

Marco

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Replies

  • Michael Müller July 2, 2012 at 8:04am

    You can calculate it here. Or you can measure the thrust of one motor and multiply it by six. If your thrust is at least 2 or better 3 times higher than your lift off weight, than it is ok.

  • Michael Müller July 2, 2012 at 6:50am

    Here is a thread about the changed min throttle and how to change it.

  • Developer
    Jani Hirvinen July 2, 2012 at 6:14am
    yeah sounds like you have prop either mounted upside down or it's on "wrong" motor and spins backwards. both will create funny tunnel kinda sound and also bad lift. dont fly before checking

    always check that air flows down under propellers.
  • Michael Müller July 2, 2012 at 5:35am

    Maybe you mounted one prop upside down. Printing must be on the top. Otherise it has only about 40% thrust and makes this noise.

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