High enough to clear all obstacles. Keep in mind, if you are set for, say, 90 feet, and the Phantom is at 120 feet, it will NOT descend to 90 feet. It will stay at 120 feet until it reaches the RTH point, then it will land. So, watch out for higher things like bridges, etc....
If you're flying indoors, (not sure I would with a Phantom but I do it often with my Spark), make sure you change it to be lower than the ceiling. Otherwise, it will attempt to ascend to what it's set for, hit the ceiling and crash.
Yes, I noticed right now. I think that mine is 30 m, and I was 40 m high and ask to return to home. So it came in 40 m and after reach RTH it started descending to the ground.
1. You're almost always going to encounter much stronger winds aloft way up at 120m. The aircraft may not be able to overcome those winds during RTH.
2. It takes energy from your battery to climb up there and descend again. Not so handy when you're low on battery.
If you need 120m to clear all obstacles for a given flight that's one thing, but keeping it set that high seems unwise if you don't need it.
1. You're almost always going to encounter much stronger winds aloft way up at 120m. The aircraft may not be able to overcome those winds during RTH.
"but keeping it set that high seems unwise if you don't need it."
Def makes sense especially with CLP and thanks for the tip.
Typically when the MP is in LOS, I'll turn off RTH then work my way to home base. I have it set there b/c for me it's the safest altitude coming in from a long distance. I find it's good clearance for flying I do in this area.
I think it always depends on the flight environment that you fly with, always set a higher altitude than the obstacles around to avoid the potential of the collision, but if it is too high, it might require much power. So it depends.
FatherXmas Posted at 2017-9-28 12:13
If you're flying indoors, (not sure I would with a Phantom but I do it often with my Spark), make sure you change it to be lower than the ceiling. Otherwise, it will attempt to ascend to what it's set for, hit the ceiling and crash.
If I were to fly indoors, I would set it to hover only.