New spin on an old thread (VPS, on vs off)
Like many, I have been flying without the use of VPS, but after watching an auto-landing at the end of a Litchi mission, I am reconsidering VPS's value.
As I said, my P3 was performing an auto-landing, when watchful as always, I noticed it was coming down at a good clip. Waiting for it to slow just before ground contact, I had my finger on the trigger as always, (ready to return to P mode and take control) and I am glad I did. Maybe three feet + or -, I switched modes and of course it stopped just short of touchdown. I was honestly concerned it would have hit too hard. This led me to start some testing for the P3's elevation awareness with VPS off. Hypothesis, it is sometimes or often wrong.
With VPS off, I flew up to 10', then 15', back down a few, then back up a few. Each time the elevation was wrong, and mostly it was reading higher than it was. Not way off, but off. Next test I turned on VPS, and after repeating the same test, it was spot on with elevation, and like other post had stated, it even followed the minor slopes of my driveway in both directions, each time the elevation was perfect. I took this test to a larger slope with a mix various materials below the P3, concrete, gravel, curbs, short grass and small scattered bushes were found at a small park. Almost everything I was looking for and of course a slope that dropped around 20 feet. At an alleviation of approximately 10 feet I first flew down hill. The P3 followed the terrain perfectly, remaining at or about 10 feet AGL. Next, spin aground and see if it would self elevate or fly into the side of the hill. Answer, elevate, not as quickly as the going down the slope, and not fast enough for an autonomous flight, but at a crawl it did elevate, right back to where I started.
Now, none of this may be new news to many, but I would conclude that if you are going to rely upon auto-land, especially under circumstances that may not allow for P mode override, i.e., out of sight critical battery landing, it may be the difference in a soft vs hard landing, and that may = no damage vs damage, or "maybe" it will it will see the changes in GL that you missed.
! VPS may have more value than it was intended for.
If anyone has information that discounts my test, please advise.
Cheers
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