Many (MANY!) years ago when I built my last carrier model I used a Clark-Y airfoil, essentially a flat-bottom section. It worked TOO well! It created so much lift that I could not get the model to stall/land, it had to be driven(!) into the deck.

I suggest a symmetrical airfoil is the better choice.

Bill

If the model is meant to hang, use a symmetrical airfoil. It makes a smooth transition into and out of the hang.
I use 12-13% at the root and 15% at the tip. Phil Cartier recently told me that the thickness didn't make much difference in high speed, and I can't dispute him, but I've been using the thinner airfoils with good results. If the model isn't meant to hang, you could probably use something flat bottom"ish", but I would mount it a few degrees negative (leading edge low) To keep it from climbing as Bill Lee described.

I have normally used symmetrical airfoils, but My seafire with a flat bottom has no problem hanging. It is not a Clark Y however but a KFm 2