Hterag
lvl.4
Flight distance : 961978 ft
China
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I hope you don't actually try this... If that were the case, the aircraft would immediately shoot into the sky, never to return, immediately after take-off. The aircraft needs to know it's actual altitude to control the speed of the motors. If it drops slightly, it increases thrust to go back. If it raises slightly, it lowers the motor speed and drops back down. The more accurately it knows it's height, the more stably it'll fly by making smaller adjustments.
Also, the sonar on the bottom is only used at low altitude, above 5-8m it switches to the barometer which wouldn't be changed by sticking tape over the sonar.
If you really want to go high, you have to start high. Start half-way up a 1000m mountain, fly to the bottom then fly to the top and you've gone up 1000m. Just be careful, I think there is a minimum height, too (might be higher than -500m).
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