Just Curious?

Pawpaw Woody · Oct 19, 2020

Flying the Mavic Mini yesterday in somewhat stout winds and in Sport mode. I wondered if flying downwind at full speed with the descent stick at full deflection is it possible to fly the Mini into the ground or do the downward facing sensors prevent this from happening? Understandably I did not want to test this quandry in flight. This is supposing a
level terrain without obstacles or abrupt elevation changes in the flight path.

THE CYBORG · Oct 19, 2020

It isn’t something I would want to do on purpose

Starz · Oct 20, 2020

I believe sport mode will disable the sensors.

karlblessing · Oct 20, 2020

Page 11 of the manual doesn't indicate any of the visual sensors are disabled and in my own testing the visual sensors still runs in sports mode. (None of the minis modes go into Atti unless gps signals are weak/non existent and too dark)

Flight Modes
Mavic Mini has three flight modes, plus a fourth flight mode that the aircraft switches to in certain
situations:
Position Mode: Positon mode works best when the GPS signal is strong. The aircraft utilizes GPS and
the Vision System to locate itself and stabilize. Intelligent Flight Mode is enabled in this mode. When the
Downward Vision System is enabled and lighting conditions are sufficient, the maximum flight altitude
angle is 20° and the maximum flight speed is 8 m/s.
The aircraft automatically changes to Attitude (ATTI) mode when the Vision System is unavailable or
disabled and when the GPS signal is weak or the compass experiences interference. When the Vision
System is unavailable, the aircraft cannot position itself or brake automatically, which increases the risk
of potential flight hazards. In ATTI mode, the aircraft may be more easily affected by its surroundings.
Environmental factors such as wind can result in horizontal shifting, which may present hazards,
especially when flying in confined spaces.
Sport Mode: In Sport mode, the aircraft uses GPS and Vision System for positioning. In Sport mode,
aircraft responses are optimized for agility and speed making it more responsive to control stick
movements. The maximum flight speed is 13 m/s, maximum ascent speed is 4 m/s, and maximum
descent speed is 3 m/s.
CineSmooth Mode: CineSmooth mode is based on Position mode and the flight speed is limited,
making the aircraft more stable during shooting. The maximum flight speed is 4 m/s, maximum ascent speed
is 1.5 m/s, and maximum descent speed is 1 m/s.
The aircraft’s maximum speed and braking distance significantly increase in Sport mode. A minimum
braking distance of 30 m is required in windless conditions.
Descent speed significantly increases in Sport mode. A minimum braking distance of 10 m is
required in windless conditions.
The aircraft’s responsiveness significantly increases in Sport mode, which means a small control stick
movement on the remote controller translates into the aircraft moving a large distance. Be vigilant
and maintain adequate maneuvering space during flight.

Bolded the part as it relates to the ops question.

SpitFire · Oct 20, 2020

Many of flight control problems are caused by neglecting 6 points, one of them for the MM is Wind speeds in excess of the design limits of the aircraft. If your going to push the envelope, good to make sure you activate find my drone, and understand how the RTH feature works. Safe flying and keep the rotors pointing up.

karlblessing · Oct 20, 2020

SpitFire said:
Many of flight control problems are caused by neglecting 6 points, one of them for the MM is Wind speeds in excess of the design limits of the aircraft. If your going to push the envelope, good to make sure you activate find my drone, and understand how the RTH feature works. Safe flying and keep the rotors pointing up.

Especially since RTH isn't going to magically fight past the maximum wind resistance. (on a windy day, I like to keep the home point downwind of what I plan on shooting so I can least have a better chance of keeping signal on and bring it down where I may be able to get to it).

Helps to treat it somewhat like a manned plane, if the wind is too much, better not to fly.

Dbez1 · Oct 20, 2020

This is just a guess... I think sport mode will be too fast for the sensors to react to the ground. I believe it will crash.

new2mavic · Oct 20, 2020

Pawpaw Woody said:
.... the descent stick at full deflection is it possible to fly the Mini into the ground or do the downward facing sensors prevent this from happening?

If the craft is within 50 cm above the ground, holding the throttle stick all the way down for more than a second will trigger landing. The horizontal speed has no effect.

If the throttle stick is held down for less than one second, the sensor will keep the craft at some distance, like 30 cm above the ground.

new2mavic · Oct 20, 2020

Starz said:
I believe sport mode will disable the sensors.

It wont because the IR sensor at the bottom is mainly for height control in landing. The craft still needs to land in sport mode right ?

Pawpaw Woody · Oct 21, 2020

Dbez1 said:
This is just a guess... I think sport mode will be too fast for the sensors to react to the ground. I believe it will crash.

Thanks, that is what I would like to know! I suspect it might burn in given enough rear wind speed that the sensors will not react in time. There are a lot of presumed variables needed to quantify this theory... None of which I want to put into practice! Yet....

new2mavic · Oct 21, 2020

Pawpaw Woody said:
I suspect it might burn in given enough rear wind speed that the sensors will not react in time.

The sensor just measures the height. In sport mode, the speed of decent will be higher when fully-down throttle is applied so there may be some lag in the height information sent to the flight controller. The horizontal speed and tail wind have zero effect on the sensor. If the ground is perfectly flat ( e.g. paved road surfaces ) , the likelihood of crashing should not be affected by the horizontal speed.

Pawpaw Woody · Oct 21, 2020

new2mavic said:
The sensor just measures the height. In sport mode, the speed of decent will be higher when fully-down throttle is applied so there may be some lag in the height information sent to the flight controller. The horizontal speed and tail wind have zero effect on the sensor. If the ground is perfectly flat ( e.g. paved road surfaces ) , the likelihood of crashing should not be affected by the horizontal speed.

Understood.... The hypothetical was full throttle with full downward stick applied during a significant tailwind. Assuming an angle of forward cant the sensors would not be in line with horizontal level terrain.

new2mavic · Oct 21, 2020

Pawpaw Woody said:
.....Assuming an angle of forward cant the sensors would not be in line with horizontal level terrain.

That's true at least on the M2P where the IR height sensor at the bottom started reporting no data when the tilting is about 30 degrees. That's the max tilt angle of the craft in sport mode.

It is easier to reach that max tilt angle in head wind of no wind. In tail wind, the craft does not have to tilt so much to achieve the commanded speed.

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Just Curious?

Pawpaw Woody

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THE CYBORG

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Starz

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karlblessing

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SpitFire

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karlblessing

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Dbez1

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Pawpaw Woody

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