Questions tagged [stability]

The capability of a drone to sustain a controlled flight.

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1 vote
1 answer
20 views

Air speed velocity of a windy situation

This is perhaps a really obvious question but I just want to make sure... If the wind is blowing at 40 km/h, do I need a drone with a max speed of 40 km/h in order to stay stable? In other words, is ...
6 votes
3 answers
115 views

The Effect of Pitching Moment on Aircraft Stability

I'm designing a small RC plane and I'm currently at the first iteration of airfoil selection. I have converged to Clark-Y, NACA-2412, NACA-2415, and S-8036. In comparing the four, I noticed that all ...
3 votes
1 answer
104 views

Advice on correct linkage to use to rotate motor mount

I'm designing a VTOL based on a conventional airplane design that will use a tilt-rotor to move the motors 90 degrees around a carbon fibre tube that also acts as the wing spar. Each motor is tilted ...
1 vote
2 answers
52 views

Can an extra 300s glide upside down and backward?

I had a crasy idea; here it is. Let's say I'm flying an 80" Extra 300s with a .6 nitro motor in it. I then go into a dive straight down with full throttle util my plane is 30 ft. off the ...
5 votes
1 answer
69 views

Quadcopter Stability Modelling

We know software like XFLR5 to model fixed-wing aircraft to determine aircraft dynamics and stability. Is there any software which we can model our quadcopter geometry in so we can know it's CoG, ...
5 votes
1 answer
271 views

How do thrust requirements change as a multirotor leaves ground effect?

Assuming either a quadcopter or a hexacopter, is there any published data on how much more energy is expended to escape the ground effect? Is it a function of the thrust being produced to lift the ...
18 votes
3 answers
5k views

Why are quadcopters inherently unstable?

I have heard it mentioned that quadcopters are inherently unstable and only become stable due to control. What does inherently unstable mean in this context, and why are quadcopters inherently ...