Welcome to PhantomPilots.com

Sign up for a weekly email of the latest drone news & information

Vortex Ring questions

Discussion in 'Pro/Adv Discussion' started by DrewFlies, May 16, 2015.

  1. DrewFlies

    DrewFlies Guest

    Does anybody know the actual rate of speed that causes vortex ring while descending? I noticed RTH descends a lot faster than me manually.
     
  2. brankster007

    Joined:
    Apr 14, 2015
    Messages:
    34
    Likes Received:
    10
    If the rate of descent on the RTH is descending to fast I would take manual control before landing. One thing I doubt the auto pilot factors in is vortex ring and if this happens as your coming into land you want to be quick on the controls to increase forward airspeed and gain height again to negate the vortex ring effect and then reattempt your landing manually.
     
  3. tcope

    Joined:
    Jan 29, 2015
    Messages:
    3,513
    Likes Received:
    1,387
    Location:
    Salt Lake City, UT
    It changes. Wind speed would have a great affect on this. The temp of the air would probably even affect it a bit. It's just not possible to know an _exact_ speed.
     
  4. snowghost

    Joined:
    Feb 13, 2015
    Messages:
    1,056
    Likes Received:
    213
    Location:
    SoCal, USA
    You might want to get something like an X5C to learn what VRC looks like in various conditions.

    When wanting to land fast I do a steep glidepath moving forward quickly.
     
  5. gunslinger

    gunslinger Moderator
    Staff Member

    Joined:
    Nov 3, 2013
    Messages:
    2,722
    Likes Received:
    497
    Location:
    Least Coast...
    +1... perfect answer...
     
  6. Monte55

    Joined:
    Apr 26, 2014
    Messages:
    2,198
    Likes Received:
    517
    Location:
    Raymore Missouri
    wind speed, air pressure and temp...density altitude, has a big effect. Props being used and weight of aircraft. It can change from day to day. Your quad will fly better in cool dense air than hot thin air.
     
  7. DrewFlies

    DrewFlies Guest

    I have read about slightly moving the quad as your descending. But, when I do that it sounds like the motors are a lot loud and the angle the quad goes in makes me feel likes it more vulnerable to crash if all of a sudden there is a high gust of wind or something of that nature.
     
  8. DrewFlies

    DrewFlies Guest

    has there been any reported issues of RTH going into VRC?
     
  9. Kristian Waalberg

    Joined:
    May 2, 2015
    Messages:
    19
    Likes Received:
    4
    This will not be a problem. Plenty of power to pull it up anyways.
     
    mmee1992 likes this.
  10. Monte55

    Joined:
    Apr 26, 2014
    Messages:
    2,198
    Likes Received:
    517
    Location:
    Raymore Missouri
    You need to try and understand this. It is simple so let's not make it difficult. An aircraft weighs a certain amount. The props, motors, battery power have to provide lift to get off the ground and hopefully more power to go out and do some serious flying. Now when the quad comes straight down with no wind, it may enter its own prop wash leading to VRS. That means it's flying in dirty air and may not be able to provide the proper lift for the craft. What to do? Add more throttle? All you do then is make more dirty air and the craft starts to decend in a uncontrolled manner. Loss of lift. Air is like water but thinner. A boat prop that cavitates can't get the thrust needed to get the job done. It needs clean water with no bubbles to push against to provide thrust. Same with the phantom in the air. Dirty air is kinna like bubbles in a way. If you move the quad sideways into clean air you regain your lift. The props need to push against good solid air rather than squishy bubble air if that makes any sense. If you do enter the VRS state and move the quad sideways...don't move with the wind, it just follows you. I can go fly my quad and take it high and bring it down fast at an angle always considering the wind direction. I can see when it starts to enter VRS. No big deal.Just get your *** into good air and fly. Forget some of the panic posts you see. So many have no clue what they are talking about. Just go out and test for yourself. You will learn more and become a better pilot. Good luck.
     
    #10 Monte55, May 16, 2015
    Last edited: May 16, 2015
    clkilljoy, Meta4 and brankster007 like this.
  11. brankster007

    Joined:
    Apr 14, 2015
    Messages:
    34
    Likes Received:
    10
    Good explanation, No amount of power will solve Vortex ring and is a common mistake among pilots and the cause of some helicopter crashes, As a qualified Helicopter pilot if you still have height the only resolve is forward flight to get cleaner air. Thats why descending from high altitude forward and down, Always forward and down even when you are practicing auto rotations as its the safest way to avoid vortex ring in the first place. When you are low enough to the ground and IGE ( in ground effect ) then you can safely descend to land vertically.
     
  12. mmee1992

    Joined:
    Mar 14, 2015
    Messages:
    340
    Likes Received:
    139
    I don't know about the phantom but from my experience flying real helicopters adding more power actually makes it worse.
     
    claws likes this.
  13. Kristian Waalberg

    Joined:
    May 2, 2015
    Messages:
    19
    Likes Received:
    4
    any clean air will fix it. Go backwards or left/right as well. No need to only go forward.
     
    brankster007 likes this.