Questions tagged [stability]

The physics of maintaining a specific state in the dynamic system of aircraft flight.

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Does/Can combustion instabilities occur in SCRAM jet?

I was told that combustion occurs at Supersonic speeds in SCRAM jet. So acoustic disturbances/ pressure fluctuations can't travel into incoming jet stream. Does this avoids combustion instabilities in ...
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Was the Wright Brothers' 1902 machine a working glider or just a kite?

Was the Wright Brothers' 1902 machine a working glider or just a kite? I spent the last days reading the letters and articles of Amos I. Root, the man who claimed he had seen Wilbur Wright flying his ...
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First Boeing 757-200 N757A 'Catfish' was modified with a Canard foreplane. How did it behave?

The aircraft had these changes made around 2006 to act as an F-22 Avionics test bed. One would expect that the fore plane changed many performances of machine, including take off and landing attitude ...
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Is there an ideal value for the difference between the stick fixed and stick free static margin?

I'm calculating the static stability for a fictional aircraft and have to determine the elevator size. I have all the calculations but don't know how to choose the correct size and position. Is it ...
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Does the 737 MAX's engine nacelle camber affect the pitching moment?

A side view of the B737 MAX's engine nacelle shows a positive camber at the top. As nose camber of any lifting shape (wing or nacelle) generally allows more lift at higher AoA, do you think this ...
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Does the angular momentum of a jet engine affect aircraft performance?

I am interested, do jet engines have angular momentum? And how does such momentum affect airplane stability?
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What Inertial effects should be considered to achieve blade stability on a Variable Pitch Propeller tailoredby aerodynamic loads?

I am developing a self adjusting variable pitch propeller tailored by its pitching moments due to aerodynamic loads setting the blade rotation axis in an offset from the aerodynamic center as shown ...
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How do boxwing and tandem airplanes balance moment

I want to build a hydrofoil like this picture: I discovered that you can pump it with a leg motion and moving the center of mass. Like this: I discovered xflr5 and ...
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Is C.G. of wing itself in line with hang point (hang glider)?

Where is c.g. of hang glider wing,at hang point ,in front or behind hang point? Is control bar "neutral" when glider is at rest and there is no wind or flip backward or forward? At 0:45 ...
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What is the manoeuvre point?

a centre of gravity position at which stick force per g becomes zero What does this mean? If the centre of gravity happened to be at the maneouvre point, would there be stick be very light in the ...
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Control surface deflection during takeoff

What is a reasonable (or typical) control surface deflections required for takeoff? I would like to know two ball park values if possible elevator deflection for conventional transport aircraft ...
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