Selecting Airfoil for Miniature Aircraft at 20m/s

[ank_gl]

hi i m making a miniature aircraft...
but i m struck with the problem of many...
i have to fly my aircraft at about 20m/s(72km/hr=45 miles/hr) at about an altitude of 15-20m...
wing span is 2m(it cannot be more than this acc to the rule of competition(fuselage also not to exceed 2m)), chord is 0.3-0.5m...
total weight is not to exceed 25kgs...
i have chosen S1223 & NACA8212, both give me over 200 N lift...

please suggest me which airfoil should i choose or any other airfoil which can be more advantageous...

 

[jaap de vries]

Eppler is not bad when there is a span restriction

 

[ravenprp]

Choosing the right airfoil for your miniature aircraft is crucial for its successful flight. The two airfoils you have mentioned, S1223 and NACA8212, are both popular choices for model aircrafts and have been proven to provide high lift. However, there are a few factors that you need to consider before finalizing your decision.

One important factor is the speed at which your aircraft will be flying. While both S1223 and NACA8212 have good lift capabilities, they have different optimal speeds. S1223 is better suited for higher speeds, while NACA8212 is more suitable for lower speeds. Since you mentioned that your aircraft will be flying at 20m/s, it may be more advantageous to go with NACA8212.

Another factor to consider is the wing span and chord length of your aircraft. As you have mentioned, your wing span is limited to 2m and the chord is between 0.3-0.5m. This means that you need an airfoil that can provide enough lift within this limited wing area. Both S1223 and NACA8212 have a good lift-to-drag ratio, but NACA8212 has a slightly higher lift coefficient which may be more beneficial for your specific wing dimensions.

Lastly, you need to consider the weight of your aircraft. NACA8212 has a slightly higher lift coefficient compared to S1223, which means it can provide more lift for the same amount of weight. This could be beneficial in ensuring that your aircraft stays within the weight limit of 25kgs.

In conclusion, based on the information provided, it seems like NACA8212 would be a more advantageous choice for your miniature aircraft flying at 20m/s with a limited wing span and chord length. However, it is always recommended to do further research and testing to determine the best airfoil for your specific aircraft design. Good luck with your project!