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2 votes

How to calculate lift and drag of commerical aircraft in different phases of flight?

So lift and drag are properties directly proportional to the angle of attack (AoA) of the aircraft. The equation for lift and drag of an airfoil would be: L=N*cos(phi)-Asin(phi) D=N*sin(phi)+Acos(...
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4 votes
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Is a yaw string better than an inclinometer in determining coordinated flight in a steep turn?

String is always better, if you can use it. The ball is less sensitive and can be thrown off a bit, such as when flying a twin single engined, and the rudder is applying lateral thrust to compensate ...
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1 vote

What does deploying landing flaps do to the (L/D)max and minimum drag speed of an airplane?

I thought that deploying flaps will increase both the drag and lift, thus increasing L/D ratio The lift coefficient increases, but the lift force does not, at least over the long run. The lift force ...
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1 vote

What does deploying landing flaps do to the (L/D)max and minimum drag speed of an airplane?

Lowering flaps generally reduces L/D max and reduces L/D max speed It really depends how you want to design your plane, but usually you want to have maximum excess power at your climbing speed$^1$. ...
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0 votes

Why does elevator input move the turn coordinator ball in steep turns?

When practicing steep turns, I'm running into an unusual phenomenon. If the airplane is losing altitude in coordinated flight and I apply aft stick pressure to pitch up and correct, I notice that the ...
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2 votes

Will this helicopter fly?

Pic source The first try may not result in a lift-off, the second try has a much higher probability of being able to fly. Large piece of plywood directly attached to the skids: the rotor downwash ...
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2 votes

how is ITT peak temperature affected by altitude during an airstart?

Heat dissipation is roughly proportional to mass flow times temperature difference. Mass flow through the intercooler is $\dot{m}=\textrm{TAS}\times \rho$. Since $\textrm{TAS}\approx\textrm{EAS}\sqrt{\...
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4 votes

how is ITT peak temperature affected by altitude during an airstart?

ITT is affected by the heat dissipating effect of airflow: The less air flowing through the turbine section the hotter it can get. So, you are correct in that IAS is the parameter that is being ...
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2 votes

How does the weight affect the altitude that can be reached by trading speed after a total engine failure?

A few issues with the concept unless hard test flight data is shown. Kinetic Energy vs drag Glider data shows us that two gliders of different weight will glide the same distance. The heavier one ...
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16 votes

How does the weight affect the altitude that can be reached by trading speed after a total engine failure?

To gain altitude (by any means) you need to gain potential energy. Since the engine has stopped, the only thing you can do is trade kinetic energy for potential energy (slow down). Since both kinetic ...
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