After a solid month of family visits, playing with the 'wiggle worm', and her baptism, it's time to get back to work!
Above is a picture of the front end of the propulsion unit -- a modified Honda GX25 4-stroke engine. I designed the cooling shroud in one weekend in September 2018 using SolidWorks and had it 3D printed using SLS nylon. The cowl flap is capable of completely closing in order to maintain a high CHT at low power settings.
While CAD-ing the shroud assembly, my wife was watching the movie "Lorenzo's Oil" in the same room. As a result, I get a distinctly sad feeling every time I look at those parts. The act of designing and building new systems is an emotional journey. Sometimes the actual emotions involved end up being quite random!
Everything in the propulsion section is close to being finalized, but there remains some additional work on carb mods and doing endurance testing. Of course, all of the wiring will need to eventually be sleeved and secured to reduce the possibility of wire fatigue.
I have also been testing an alternate, high-power 2-stroke engine. However, given my time constraints, the integration work for this engine will likely be shelved soon in favor of the ready-to-go 4-stroke engine.