Dji Phantom 2 Vision + User Manual download pdf (Page 19)

At the first signs of VRS something like the following make a good escape plan:

1) Release throttle.

2) Push Forward or Sideway at full thrust to get clean air and try to "punch out" of the vortex. If possible, punch out

into or across the wind (upwind or crosswind).

3) Flip to ATTI mode.

4) If uncontrolled yaw/rotation is occurring, apply opposite yaw to stabilize heading.

Avoiding VRS

Of course, none of this guarantees you WILL escape VRS, so it's highly preferred to avoid VRS altogether if possible.

Tips I've gathered from extensive reading on this topic as well as my own sad experience include:

1) Don't fly when wind speed is >13-17mph. DJI is explicit about this in the manual. Beaufort scale 4 for those of

you who prefer that sort of thing. Remember that winds aloft can differ greatly from wind speed on the ground.

A quick flip to ATTI mode aloft and observing drift or observing the OSD horizon line in GPS mode can help

gauge wind speed and direction at your flight altitude.

2) Limit your "straight down" descent speed.

3) Never descend straight down, especially if coming down fast. Maintain lateral movement when descending to

keep the quad in "clean air" (zig zag, side-to-side, circle, etc).. Always descend at an angle (preferably into the

wind) - Fly forward and down OR while flying a circle - Circling down in small spirals.

4) Avoid fast yaw movements where possible and avoid fast yaw combined with descent. You can enter your own

prop wash and provide the conditions for VRS.

5) There have been many reports of users with prop guards and heavily laden quads encountering VRS. Many

observers appear to agree that using prop guards appears to increase the chances of invoking VRS.

H- Low Battery

The Phantom has two levels of battery warnings: Low Battery Level Warning and Critical Battery Level Warning.

The battery warning level is no longer set by battery level. It's now controlled by estimated flight time remaining. The

thresholds for these warnings are automatically determined based on the current aircraft altitude and its distance

from Home Point. The yellow and red zones will grow or shrink depending on how far away your phantom is from

home point. Yellow is low battery warning, red is RTH.

If you enabled “Low Battery Auto Go Home” (using either the DJI Phantom Assistant or DJI Vision App) and the

battery level reaches the Low Battery Level Warning, a message will appear on the DJI Vision app screen. Tap

“Go Home” to have the aircraft return to the Home Point(RTH) and land automatically, or “Cancel” to resume

normal flight (be sure to land it manually, ASAP). If, after 10 seconds, no action is taken, the aircraft will

automatically go home and land. Personally, I have it disabled because RTH flies very slowly and odds are it may

not make it back anyway. Home lock and full back on the stick is much faster. Be sure you always keep an eye on

your battery status, if you disabled it.

When the battery level reaches a Critical Battery Level Warning, the DJI Vision app screen will flash red and the

aircraft will automatically land straight down and power off the motors after landing.

You may be able to keep it aloft by applying some throttle to manoeuvre to a safer area, but at that point you are

flying on borrowed time - you can't really know how quickly the battery will die. If the Phantom happens to be

fighting the wind, it could be much quicker than you think. And when the battery is exhausted…well you know

what’s gonna happen!

With the new firmware: the Phantom has maximum descent speed set to 0.6m/s when the aircraft’s altitude is less

than 10m and descending automatically (for example in failsafe mode). The maximum speed of descent remains

2m/s in other flight conditions (DJI way to try minimizing VRS). If you are way up in the air, you might find this

painfully(read stressfully) slow... So plan ahead. Remember to always keep an eye on your battery status versus

your current aircraft location. Know when it's time to come back safely. Personally, when I'm near 30%, I make sure

I'm close to my Landing Location. Better safe than sorry!

Need to Know: Avoid Over Flying your Battery. Over flying battery times can damage battery cell and life

expectancy. It is recommended to bring your aircraft on the ground when battery level is around 30%.

Be sure to check the “Battery Status” Section.

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