I have never assumed the novice builder is without math or physics skills - only about aerodynamics in particular. I belong to a club that is filled with engineers and tech guys who have no trouble with the math or physics. I always ssume that is the case until the questioner says they can't understand what you are saying. I would think guys at a keyboard have elementary math skills.

This isn't presenting things to a jury (I would hate to be on a jury and felt that I was being talked down to) - it's simply talking aerodynamics. It's a lot more fun when you really understand the details about what is going on. Questions like this one using symmetrical airfoils, factors in real airfoil design (not just drawing curves), etc., are fun and just not that hard to understand. The thing is that aerodynamics isn't magic or wild guessing. It is based in science which most of the guys that post here have had some of.

Why not present it that way? We have disagreed on this before - I can't stand your approach. I just realized why I stopped answering questions months ago.

Ben