Cetacean
Captain
Flight distance : 2528264 ft
United States
Offline
|
Drone AV Posted at 10-17 12:55
No. I did not try the RTH at that time, because there were trees closed by. So, I did manual descending. But does it matter to use RTH or manual descending? Is it typical for descending slower than ascending, for whatever reason ?
Thanks
Aloha Sam,
There are a number of reasons for a slower descent rate than an ascent rate. One is Vortex Ring State (VRS). VRS can create a loss of lift under power called "settling with power". What that means is, as with all helicopters (including the V-22 Osprey - one crashed because of VRS), a downdraft is created that produces a localized condition in which the air rushes straight down in line with the descending aircraft. If the aircraft remains in the descending column of air, it will crash no matter how much lift is applied to the main rotor. The stealth H-60 involved in the Osama bin Laden raid also crashed due to VRS.
For the most part, DJI changed the alignment of the four motors of their quads so that there is no full-blown down blast of air. This started with the P2 V3. But still, there are possible situations where your aircraft may get caught in its own downdraft due to unique wind conditions if it descends too fast.
Hope this helps!
Take care and be safe!
Aloha and Drone On! |
|