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While working on my project I gave my RC plane's nose a particular shape. It doesn't resemble any simple shapes for which coefficient of drag is provided on Internet. I don't know simulations. Also I don't have any wind tunnel facility for my project. So is there any other way, any website or any formula for computing coefficient of lift and drag?

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    $\begingroup$ Search for computational fluid dynamics (CFD). I think there are open source programs that run on a PC. Not a simple task, though. $\endgroup$
    – jamesqf
    Jan 22, 2018 at 20:07
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    $\begingroup$ Could you elaborate a bit on what you plan to do with the coefficient? $\endgroup$
    – rul30
    Jan 22, 2018 at 21:28
  • $\begingroup$ I don't know simulations on any software. I also don't have much time to learn simulations. $\endgroup$
    – Xeno
    Jan 23, 2018 at 12:32

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There are essentially only two ways to do this.

First you can build a wind tunnel, run experiments and measure the forces involved.

The second is to run a computer simulation. There is software that will do this, but it is complex professional grade engineering software. Free applications are available, but I can't vouch for their effectiveness. You can search for "computational fluid dynamics software" to find options. Adding "free" to that will find you a few cost-free options.

Be aware that setting up and using this software is a complex task that involves creating a CAD model of your shape. You can definitely do the calculation if you are interested, but it's not a simple or quick task.

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If you just want answer, use wind tunnel. If you want to calculate the answer, you must solve Navier-Stokes equations, with boundary conditions established to represent the shape in question. This is done using numerical analysis and is an advanced mathematical process involving complex analysis (by which I mean meaning using complex numbers and complex functions).

As mentioned in another answer, there is software available that does much of this for you.

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