<html><head></head><body><div class="ydpd768b2b7yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">Hello Gang,</div><div dir="ltr" data-setdir="false">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 <i>old</i> picture to give you a visual of what it looks like (I'll post some new ones soon). <b><i>Any</i></b> 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!</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">God bless and Merry Christmas to all! Jim</div></div></body></html>