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This question is asked in context of a fixed wing, Unmanned Aerial Vehicle (UAV), with a wing span of about 5m (16ft).

How far ahead of the wing leading edge should the propeller be located?

The propwash should have minimal effect on stability and should not adversely affect the airflow over the wing.

Can propwash be useful?

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    $\begingroup$ Your question is a bit vague. Do you want the props as close to the wing as aerodynamically possible, or as far from the wing as possible? $\endgroup$ – Timpanus Feb 10 '16 at 11:48
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    $\begingroup$ Are you designing a twin? Because with single engine you don't have much choice: you must place the prop at the nose (or tail; pusher is a choice you do have) and the wing according to the centre of gravity. $\endgroup$ – Jan Hudec Feb 10 '16 at 13:44
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    $\begingroup$ Why does it have to be ahead of the leading edge - I can think of a few where it is to the rear. $\endgroup$ – Adrian Feb 10 '16 at 14:02
  • $\begingroup$ Sorry for not being clear. $\endgroup$ – Rohan Feb 11 '16 at 12:41
  • $\begingroup$ I am only looking for a tractor configuration, for now. It is a single prop not twin. So, I want to know what should be the distance between the propeller and wing leading edge so as to minimise the disadvantages of propwash. Is there any rule of thumb or empirical relation or any relevant material on this? Re~ 5e5. $\endgroup$ – Rohan Feb 11 '16 at 12:48