click here
or see this:

Easy, angle 70, power-wind*wind factor= the power ur gonna use
this is accurate for distance around 1 SD
btw red area isnt suggested to use 70 angle, i wud rather choose low angle
also for green area, the further distance the bigger wind factor it has
for yellow area, the closer the bigger wind factor.
just add/subtract wind factor slightly.
have fun
PS wind factor increases if the wind is big
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