short WTC Test. see https://youtu.be/DMYfmBc6ZsA
if you like. Material used Acrylic Tube, 1.5mm Finnboard for Top and bottom cover (several layers) and inlay mockup, 2 O-Rings for sealing for each cover, vaselin, several O-Rings for Alu pipes for inside sealing.
During the test i realized that i would need a filling pump to speed up diving process. The 4mm PVC pipes are bit small in diameter.
Propeller and shafts finished. That has been some trouble with these low quality propellers. Out of line with the shafts. Needed to redo the m3 thread for proper alignment. Also one brass tube has had a 0.1mm smaller ID, so that the shaft didn't move inside. I did check it with a different 3mm shaft and that one was ok. Should have waited for the proper shafts and do the fitting test on the workbench before .... i keep on saying that to me ... ignorant old man ...