4k views

### Why do tapered wings not stall at the root first?

Why do moderate tapered wings stall first at mid-wing section and high tapered wings stall at tip first? The effective AoA should be always higher close to the root? (considering no geometric or ...
1 vote
2k views

### How to calculate the zero lift drag coefficient for a wing with data from airfoiltools.com? [closed]

I'm currently trying to write a script in python that I can use to optimalise a flying wing aircraft. I've run into a problem when trying to use data from airfoiltools.com. I've tried to calculate the ...
1 vote
1k views

### How do you calculate the wing moment coefficient knowing the moment at each spanwise station?

A lot of theoretical formulas exist for finding the moment coefficient for airfoils, but I have been confused by how to get the moments for a wing. I came up with three related questions that have ...
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1 vote
857 views

### L/D -Bell vs Eliptical spanload?

look at this video from 18:00-21:00 ,Al Bowers talk about benefits of bell spanload compare to classic eliptical..Can someone explain what does it mean in practice examples when design aircrafts: 1)...
• 177
1 vote
2k views

### How much is alpha induced angle?

I know that alpha induced rise with increasing AoA but how much is alpha induced in reality ,are we talking about 1-2 degrees or more?
• 177
273 views

### Do horizontal stabilizers on airliners have varying angle of incidence in the span-wise direction (washout or negative twist)?

Reading this question and answers, I was wondering if modern airliners with cruciform tail have some noticalbe washout or negative twist along the horizontal stabilizer's span. During cruise, if wing'...
4k views

### Does an elliptical wing planform have an elliptical lift distribution, and is that the most efficient shape?

I know that there are similar topics already here, but after reading them I still do not understand everything. From what I know an elliptical lift distribution gives the least amount of induced drag. ...
• 2,025
1 vote
929 views

### Why is a reduction in lift called 'drag'?

Induced drag is high pressure air 'leaking' to the upper part of the wing (low pressure zone) creating a vortex which means the area of the wing tip with the vortex can't create lift. Drag on the ...
• 767
945 views

### Why do the elliptical and the rectangular wing show different aerodynamic efficiency?

I understand the elliptical planform is aerodynamically the most efficient type of wing planform and generates the greatest L/Dmax, but it's difficult for me to understand why. What makes the ...
• 7,565
7k views

### Why does the elliptical wing have the lowest drag?

I read that the elliptical wing has the lowest induced drag. Why is that so? I welcome a mathematical and intuitive explanation.
• 649
6k views

### How is the induced drag calculated for a wing with elliptical planform?

How is the induced drag calculated for a wing with elliptical planform ? Is this wing shape the most efficient ?
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