# Questions tagged [lift]

The force acting on an aircraft in opposition to gravity which keeps the aircraft in the air.

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### What is the total lift equation of a helicopter with 3 Flettner rotors?

I'm doing research regarding the possiblity of using Flettner rotors on helicopters. I would like to derive the total lift equation for a helicopter that consist of 3 Flettner rotors. Given that: ...
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### Is there any bibliography for triplane aircraft design?

I've been tasked with designing an RC aircraft that has the greatest lift force for a specified wingspan, total length and takeoff velocity, and thus have been studying the different wing ...
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### What is the effect of wing flex on wing's airfoil shape and its performance effect on wing?

There are good amount of discussion on wing flex in this forum. I am more interested in understanding the effect of flex on aerofoil shape of the wing and its impact on flight performance. Do ...
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### What is the relation between solidity and lift coefficients?

I've seen this graph in a couple of places. I'm not sure what it's supposed to mean, as the formulae I've seen in the papers cannot be found in any standard book or reference. Please let me know if ...
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109 views

### How much lift can be generated by the intake lip of a duct?

How to calculate the extra lift gained by the intake lip of a duct? Aside from improving efficiency by preventing tip vortices, if a duct has a bell-shaped intake, this lip around the edge creates ...
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### Where does the lift act on a B747-400 wing when the aircraft flies straight and level?

I'm doing a math exercise and I'd like to understand: Where does lift act overall on the wing of a B747-400 when the aircraft flies straight and level at its cruise speed. Which parameters, if any, ...
1answer
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### How can the lift induced drag for a wing be calculated?

I have found a lot of information to calculate drag coefficients and I know that total drag can be calculated by $$D = \frac{1}{2} \rho u^2 S C_d$$ However I was wondering, if I substitute the zero ...
1answer
83 views

### Calculate g's per radian

I'm currently attempting to assign handling qualities to the A-4D, and I would like to know how to find the term: $n / \alpha = \overline{q} \times C_{L\alpha} / (W / S)$ where $C_{L\alpha}$ is ...
1answer
24 views

### What are the best methods for calculating lift during different stages of flight?

Supposing I have the all dimensions of an RC airplane: wingspan, NACA airfoil, aspect ratio, fuselage length, etc., what would be the best methods of calculating the expected lift the aircraft should ...
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### Why does the tapered part of the wing has high coefficient of lift? Like a Delta wing design

If we take a Trapezoid wing shape as an example and see that it has low 𝑐𝑎 near the root of the wing and very high 𝑐𝑎 at the tip. The Lift generated, however, is reversed to the that of the 𝑐𝑎. ...
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### Whats the effect of aerofoil camber and thickness on Clmax and Cdmin?

Does anyone have any experimental references/wind tunnel testing testing data for various thickness and/or camber?
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### How calculated the drag coefficient lift coefficient with pressure coefficient?

I have got the Cp Plot on a wing, now I am trying to calculate Cl and Cd. And the angle of attack is 0 degrees, the wing has been split into N Panels, and the normal vector ni for every Panel is ...
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### The lift and moment of the tail equations

We have The lift of the tail, $$L_t = C_L.q.S_t$$ The moment of the tail around c.g. $$M_(cg,t) = C_M.q.S.c$$ look at the S in the two equations. Why the lift of the tail is proportional to the ...
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### How can we find maximum lift coefficient of Airfoil?

I am trying to find the maximum Lift coefficient for airfoil NACA 64A-404. I chose this airfoil for wing. I am stuck at finding the Clmax. I tried to use javafoil but javafoil is showing Cl less than ...
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### Calculating Lift of a closed-wing drone

A group of students and I are designing a theoretical closed-wing drone and need to calculate lift based on the NASA lift equation. We've designed fixed-wing aircraft before and when it came to ...
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### How do I calculate the center of lift?

See my other question here for the background context. Consider this simple plane. I have applied the 4 basic forces: lift, drag, weight, and thrust. My question is, where, precisely, do I apply the ...
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123 views

### What are the effects of endplate on airfoil section?

A 3D wing cannot achieve the same high lift/drag ratio (more than a hundred sometimes) displayed by a 2D profile (airfoil section). This is due to 3D effects like spanwise flow, wingtip losses(...