Awesome! Thanks for the update. What did you end up using for a wing spar? it is something I am concerned about with my plane if I end up finishing the drop bays. I don't have enough channels on my current radio to add the servo controlled bay doors. We don't want to re-enact this: wing failure
Thats gonna be beefy but will work quite well for you. I usually suggest the home depot ruler because it keeps weight down, and you can keep the strength going in the important direction, vertically, but if you're doing the armin wing, you're going to wind up with a wing with a 1.25/14 aspect ratio or about 9% which is pretty good.
The symmetrical airfoil is another good point, now I have another item to add to the list of changes I want to make to my design.
The Mars did use a symmetrical airfoil, but it also had 5.5 degrees of incidence. A heavy lift model will either need some incidence if using a symmetric airfoil, or need a thick asymmetric airfoil (USA 35A, USA 35B, Clark Y). The USA 35B and Clark Y are both excellent airfoils with gentle tendencies. You might consider adding split flaps for a heavy takeoff for the 35B or Clark Y though. It will give you the increased lift for takeoff, but you can retract them in flight and reduce cruise drag.
That is a very good idea, here is a link to some fowler flaps that Andres designed for his P38 build. Fowler Flaps I will look at adding them between my nacelles and fuse.
