endotherm
Captain
Flight distance : 503241 ft
Australia
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The Phantom 3 is limited in its vertical descent speed to 3m/s (~10ft/second). This speed is deliberately limited to avoid a ring vortex state under the aircraft leading to a loss of control, preventing you flying into your own choppy, upset air beneath. It really won't matter from how high you start, as it will quickly achieve that speed and descend no faster. Landing and hitting the ground at that speed is survivable, but not recommended -- it is a heavy landing and you will hit quite hard. In reality, as you get close to the ground, the down wash from the rotors will cause the air to get much denser, as the air no longer has anywhere to push down and out of the way. This has the effect of creating a "cushion" of air that can slow and protect the aircraft to some extent in the last few centimeters before touchdown.
I'm not sure sensors play much of a part in this, as none of them are designed to tell you where the ground is. The only ones likely to contribute anything are the VPS system if you have that turned on, they might assist in maintaining a stable and accurate altitude reading on the way down. They don't take over and fly and land the aircraft for you though, you are still in control. The best advice is to ease off on the stick as it is touching down, inputting less and less power the lower you get. You can still land quickly and smoothly using this method. It is similar to how an experienced driver brakes in a car. You can come to a quick smooth stop by pressing the brake pedal hard , but lifting off the pressure in the last moments before stopping, eliminating that jarring shake at the end you experience when a novice is driving. You probably do it subconsciously after developing some experience, landing is no different.
My advice for landing would be to descend to 1 or 2 feet and hover over your "landing pad", then pull the stick down gently, probably only a third of the way down and no more than 50% deflection until it touches down. You might get a little bounce, but hold the stick down fully for a few seconds until the aircraft detects there is no movement, and the motors will disarm.
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