Hello,

I'm making a 1/4 scale Extra and looking over many different designs of kits and full scale I noticed there is a difference in airfoils between the model and full scale.

I've noticed the full scale has the thickest part around 18%-20% or so but the models are around 25%. The model I'm making will be for 3-d and slow speed of course but could some one tell me which would perform better.

These images I uploaded are just an example of the differences. One is thicker with thickest part closer to the front and other thinner with thickest part further aft.