Questions tagged [stability]

The capability of a drone to sustain a controlled flight.

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3 votes
1 answer
52 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 ...
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5 votes
3 answers
64 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 ...
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1 vote
2 answers
49 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 ...
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5 votes
1 answer
46 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, ...
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5 votes
1 answer
180 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 ...
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17 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 ...
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