Thank you sir!
So, it blew a fuse......but after running for 45 minutes.
I did the initial trial, but shortly after running it (it ran so well and behaved so nicely) I handed the controls for Sam to run.
He and I both were able to get a pseudo neutral buoyant (well close enough) attitude with the Neptune.
So I went to go sit with grandma and Tina and a little while later, the sub was on the surface and Sam yelled it stopped. We figured it ran out of battery. Although that was pretty harsh not to let us have any throttle to guide it in.
When I got home, I put the battery on the charger and it had about 11.7 volts on it, I thought that should be more than adequate to run. Checked the fuse and that is when we discovered the fuse was blown. The internals were dry (yeah!) and I did not smell any electronic burning smell. So gurus of the Neptune, is the prop too much for this boat? It is a three blade, 40 mm outside diameter with a 41 mm pitch (do not know for sure what that means or if that is a steep pitch). How does the Raboesch prop compare to that?
If you can cut, drill, saw, hit things and swear a lot, you're well on the way to building a working model sub.