New answers tagged

1 vote

How to calculate optimal flight climb angle?

Did I do something wrong? No, if you have no thrust limitation, your result of a vertical climb is correct. Rockets ascend that way initially while air is dense to minimize the energy expended. On ...
0 votes

How to calculate optimal flight climb angle?

I may have missed something but your drag equation seems naive and so gives the wrong sort of speed-drag curve. You need to include the induced drag component. Vx is CAS for best angle of climb[...
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1 vote

what exactly Vx and Vy for in gliding and powered descent(piston-prop aircraft)

This might be easier conceptually to look at thrust as negative drag. A powered descent means a flatter angle of descent than an unpowered descent, you've just turned your Cessna 172 into a high ...
4 votes

what exactly Vx and Vy for in gliding and powered descent(piston-prop aircraft)

Vx (the speed of the steepest climb, ie. speed with most excess force) and Vy (the speed of the fastest climb, ie. speed with most excess power) are defined with climb power. I don't really see they ...
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2 votes

How did the 747SR fly from Qatar to London?

I was crew at Qatar in the days of the 747. On the London Gatwick route (no routes to Heathrow in those days) was via Cairo in both directions. The flight to Manila would route Doha - Dhaka - Bangkok ...
0 votes

How to calculate optimal flight climb angle?

Being $\gamma$ the climb angle, the simplified equilibrium equations on the horizontal and on the vertical direction are: $T=D+W\sin\gamma$ $L=W\cos\gamma$ with the vertical velocity aka rate of ...
  • 916
1 vote

How to calculate optimal flight climb angle?

The optimal flight rate of climb angle can be derived from Vy. Basically, at Vy, one flys the plane at optimal angle of attack and optimal thrust output. As we have learned, lift is less than weight ...
0 votes

How to calculate thrust force of an aircraft for steady flight?

I will not be able to tell you whether your approach is appropriate or not - rather, by attempting to better identify some of the assumptions/approximations in your approach, you will need to decide ...
1 vote

Will a heavier aircraft be more efficient at high speeds(cruise)?

Will a heavier aircraft be more efficient at high speeds(cruise)? If the aircraft is a glider, then yes. Gliders very often carry water ballast to increase their weight, and thus reduce their sink ...
  • 17.6k
1 vote

Will a heavier aircraft be more efficient at high speeds(cruise)?

Inertia is a property related to acceleration, as in Newton’s first law $F = m \cdot a$. If we want to change the current velocity of the aeroplane, we need more force to do so when inertia is higher. ...
  • 58.9k
5 votes
Accepted

How Do Pilots Account for Weight Shift?

Luggage shifting generally isn't a problem, since large luggage volumes are containerized and therefore compartmentalized, and in smaller jets like corporate aircraft, the luggage is confined to a ...
  • 110k
4 votes

Will a heavier aircraft be more efficient at high speeds(cruise)?

Inertia is defined by Oxford languages as a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external ...
  • 21.8k
6 votes

What difficulties may you find when controlling an aircraft with one engine on fire?

Airplanes and helicopters are designed so that their control does not depend on the engines and they can be controlled even with no engine power. The asymmetric thrust—in twin-engine plane with one ...
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2 votes

Matching the Drag Equation to Real Airplane Data

What you describe is commonly called the quadratic drag equation. While not perfect, does this methodology make sense? Yes, see answers here, here and here, for example. But you can easily refine ...
1 vote

Why increase chord length for supersonic aircraft (swept vs delta wings)?

Open to all answers, but mathematically justified would be awesome. Aerodynamics is what keeps aeroplanes in the air, and is ruled by physics. The equations used in OP are simplified physics ...
  • 58.9k
0 votes

Why increase chord length for supersonic aircraft (swept vs delta wings)?

Using a delta wing instead of a highly swept wing for supersonic aircraft has positive effects both from an aerodynamic and a structural point of view. From an aerodynamic point of view, the biggest ...
  • 916
2 votes

for a piston-prop aircraft, why "V max excess power" equals Vmd and "V max excess thrust" equals Vmp?

Power in aviation physics is Thrust × Velocity. The best combination of these two is V max excess power, meaning (because of the drag curve) that no other speed will give a better rate of climb. V ...

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