[PSUBS-MAILIST] Hydrodynamic question

[james hughes via Personal_Submersibles]

Hello Gang,My sub is nearing completion after many years of work.  I based the design primarily on the K-250 blueprints I have but instead of having thrusters on the sides I have a 16 inch propeller under the aft ballast tank (linked to a 10 horsepower motor on the inside) and a 108 pound thrust trolling motor mounted under the forward ballast tank to help me turn port or starboard at low speeds.  My question is: Do I need to add dive planes in order to keep the thing level as I cruise along above the sea floor at about 2 to 3 knots?  The boat is 25 feet long, 5 feet in diameter and will weigh in at about 8 tons (with about the bottom 12 inches of the sub filled with lead ingots).  Attached is an old picture to give you a visual of what it looks like (I'll post some new ones soon).  Any input would be very much appreciated  but I would really like to hear from anyone who has operated something like a K-350 using just the aft motor when submerged.  I don't mind making changes / additions at this point but really want to get this thing done and in the water so I'm hoping I can go without the need for dive planes.  Please let me know what you think!
God bless and Merry Christmas to all!  Jim
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