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  1. Phillip LaRose

    Joined:
    Apr 23, 2016
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    Location:
    Hellam,PA
    I have flown my P4 over many different types of water from large rivers, 1 mile wide, to small rivers, small streams,waterfalls, rapids, etc. Never had a problem until the last 2 flights. The last flight was over a small creek with flowing water and some faster water over rapids. Trees lined both banks with a small clear area between them. Water was muddy, a light brown color and shadows under the trees with bright spots with glare away from the trees. It was a bright sunny day. I started the flight by flying about 20 feet from the bank and 10 feet over the water where there was fast water over very small rapids. It would not hover and moved in the direction of the water flow. I had complete control of it and decided to fly upstream. I flew upstream a fair distance until trees on both banks blocked my way. My speed was very slow, 1 to 2 mph before stopping under a tree with a dark shadow where the water was flowing but not rapids. My P4 went up several feet and began to go backwards in the direction of the water. I started to turn and go forwards just as my props hit some leaves. I thought sure I was going in the water but I was able to fly away and return home safely. That was my blessing for the day!! When I got back to the car, I decided to test the P4 from the parking lot. It hovered rock solid. I think these conditions were just right to fool the sensors. My P4 has been rock solid over land and water except for these last flights. I also calibrated the IMU before the last flight.
     
  2. Meta4

    Meta4 Moderator
    Staff Member

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    Water is never going to provide a good surface for the VPS which needs:
    Operating Environment .. Surface with clear pattern and adequate lighting (Lux > 15)
     
  3. Reed L

    Joined:
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    Location:
    Alta, Ca.
    Was VPS turned on? :) Turn it off over that type of water and that should cure the problem.
    Ha Meta, you beat me :)
     
  4. WWK888

    Joined:
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    I thought there was no option of turning the VPS off on the P4. If you know how can you share how it is done?
     
  5. AsiaFlyer

    Joined:
    Aug 10, 2014
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    Location:
    Koh Samui, Thailand
    No option to turn it off like you can with the P3
     
    Reed L likes this.
  6. Reed L

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    Location:
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    So you need to put a piece of electrical tape over the eyes then... :)
     
    IslandDave likes this.
  7. Phillip LaRose

    Joined:
    Apr 23, 2016
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    Location:
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    Very interesting. I will try it.
    Thanks.
     
  8. stefan350

    Joined:
    May 31, 2016
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    Wow.


    I noticed the same thing when I try to hover over my pool.


    Sent from my iPhone using PhantomPilots mobile app