My two cents worth: If I were to spend the time, money, & effort to build a submarine I would not run it in water such as you are describing. Yes, the iron will most likely cause glitching, all subs will glitch occasionally, but think about what that iron in the water will do to your sub. I would fear more the chance of the water damaging or destroying bearings, paint and anything else it comes into contact with. I would look for a cleaner place to run it. If you do run it in the canal I would suggest a good cleaning after every time you run it. Flush everything out with clean water and let it air dry before reassembling it.

Good luck in your running!

Pete


there are two types of ships: submarines and targets