Good Luck! Great project! Here is a wing construction document that is most helpful. I am searching for a supplier for the spars, and will post it when I find it. 2.5" x 1/16" x 144" tubing: https://www.extrude-a-trim.com/aluminum-extrusions/aluminum-tubing/aluminum-round-tube/9 2.5" x .083" x 144" drawn (stronger) : https://dovertubular.com/aluminum-seamless-tubing-search/ Wing contruction.pdf
Allen, don't worry too much about CHT, the EGT will cook your engine in seconds. Basically, when trimmed at high speed cruise at high EGT (for gas efficiency) do not dive the airplane, this will make the rpm rise and the EGT will go very high very fast. In 10 seconds you can lunch your engine. To descend from high speed cruise, slow down first, then pull back the throttle.
I removed my Maule and put on the Matco single arm wheel, it is lighter and less expensive, and I am not sure the dual arm has any great advantage. The pneumatic wheel is terrific, and is also so much quieter! It took a bit to get it to not shimmy, just follow the directions.
109jb I am putting a bunch of Tesla batteries in my new off grid house and have learned a bunch about them. For our purposes, while the weight savings is fantastic, the down side isn't Freezing weather is one, they really misbehave if you charge or discharge them below freezing. Also, the battery monitor has to be unique to the type of Lithium battery, in terms of the allowed max voltage, charge rate and such. I wanted to go the route you thought about, then went to Walmart and bought another lawn tractor battery!
My header is not vented, the wing fuel flows into it, and it has lots of headspace to collect air, which I expel prior to every flight. I open the valve on the top and drain the fuel onto the ground, thus assuring that the air is let out first.
109jb, Your discussion is helpful, your math, not so much. Total drag = Parasite + Induced drag. That means the Vsquared Parasite drag is ADDED to the Incuded drag to make total drag, so Total drag goes up by MORE that Vsquared. Somehow you think Induced drag is subtracted from parasite drag in the process, where this came from, I don't know. The fact that Total Drag line on the plots you provide is ABOVE Parasite drag is lost you you, but it shows that total drag is more than parasite, so it goes up to a higher value than parasite drag. Total drag rises faster than Vsquared, my friend. Here is nice discussion: http://www.pilotfriend.com/training/flight_training/aero/drag.htm
Oh for Pete's sake, save us the internet version of anti-vaccination, ok, 109jb. Or else write NASA and tell them your crackpot theory. Until then, drag goes up by V squared, and in fact power required goes up by V cubed. https://www.grc.nasa.gov/WWW/K-12/airplane/drageq.html