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<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;">Hey, Jim,<br></span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"> </div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;">The size of that beast is quite impressive. You've received some excellent advice</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;"> from the group. I'm curious about a few other items:</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;">1. Where are you located, and where do you plan to launch?</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;">2. How do you plan to launch? Trailer, gantry, davit, or ???</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;">3. Whichever end goes into the water first might require more draft than the boat</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;"> will when it's level. If launching from a ramp it can be a major challenge to</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;"> get it far enough out from the water's edge to float free of the trailer.</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;">4. Salt water or fresh? I've noted that interior corrosion can be a bigger issue</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;"> than exterior corrosion, and it can occur amazingly quickly. You can wash</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;"> the exterior after a dive.</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;">5. What operational depth did you design to?</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"> </div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;">We'll all be eager to see it get wet for the first time.</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"> </div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;">Cheers,</span></div>
<div class="userEdit" style="font-family: arial, helvetica, sans-serif; font-size: 10pt; color: #000000;"><span style="color: #000000; font-style: normal; font-weight: normal;">(the other) Jim T.</span></div>
<br>In a message dated 12/20/2023 5:39:25 PM Central Standard Time, personal_submersibles@psubs.org writes:
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<div dir="ltr">No worries, I still found your email useful and I certainly appreciate it!</div>
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<div dir="ltr">God bless, Jimhey</div>
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<div>On Wednesday, December 20, 2023 at 01:25:39 PM PST, Alec Smyth via Personal_Submersibles <personal_submersibles@psubs.org> wrote:</div>
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<div dir="ltr">Sorry Jim, it’s only reading Hank’s response that I realized you do not have vertical thrusters. I thought you were asking about trim control, as in keeping on a level plane. But I most definitely agree with Hank that you need vertical thrusters. Sorry, I took those for granted.</div>
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<div dir="ltr">Best,</div>
<div dir="ltr">Alec</div>
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<blockquote>On Dec 20, 2023, at 12:42 PM, hank pronk via Personal_Submersibles <personal_submersibles@psubs.org> wrote:<br clear="none"><br clear="none"></blockquote>
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<div dir="ltr">Hi Jim, Great size for a Psub. I always say building bigger is much easier as you get older.</div>
<div dir="ltr">You will need vertical thrusters, for sure. I find dive planes difficult and not much use at slow speeds. Depending on size of coarse. If you get the sub trimmed perfectly, you need a way to push the sub down. If you dive slightly positive, you will land on the bottom. You will then add a pinch of air to become ,neutral. Now you need to lift off the bottom and start your travel, that requires thrust. If you add too much air to get a bit of altitude, you are heading to the surface. It becomes semi controlled bounce. Bolt a couple of thrusters on and you dives will be much more enjoyable. Because trolling motor thrusters are terrible in reverse, consider mounting two in opposite directions on each side, or front and back.</div>
<div dir="ltr">Good luck and keep us posted.</div>
<div dir="ltr">Hank</div>
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<div>On Wednesday, December 20, 2023 at 04:49:14 AM MST, <a href="mailto:vbra676539@aol.com" target="_blank" rel="noopener noreferrer">vbra676539@aol.com</a> via Personal_Submersibles <personal_submersibles@psubs.org> wrote:</div>
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<div dir="ltr">Understood, and best of luck. </div>
<div dir="ltr">Vance</div>
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<div>On Tuesday, December 19, 2023, 10:54:31 PM EST, james hughes via Personal_Submersibles <personal_submersibles@psubs.org> wrote:</div>
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<div dir="ltr">Dear Vance,</div>
<div dir="ltr">Thank you (to say the least) for your input! Much as I would like to go without any significant further changes to my boat I think I may just have to now. But having said that, I may see how the boat handles without any dive planes or additional thrusters. The simple truth is that I'm under a bit of a time crunch and may need to put any major changes off until later (I need to get this thing out of my brother's backyard ASAP). </div>
<div dir="ltr">Thank you again and Merry Christmas! Jim</div>
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<div>On Monday, December 18, 2023 at 05:29:19 PM PST, <a href="mailto:vbra676539@aol.com" target="_blank" rel="noopener noreferrer">vbra676539@aol.com</a> via Personal_Submersibles <personal_submersibles@psubs.org> wrote:</div>
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<div dir="ltr">Jim,</div>
<div dir="ltr">As someone who has spent thousands of hours piloting 18 to 25 foot long subs with 10 hp motors, I can say with utter certainty that you would get some degree of use out of ANY additional maneuvering thrusters and/or control surfaces. The Perry boats generally had at least three small on/off reversible thrusters (usually fore and aft lateral, and forward vertical) plus a barn door rudder and side mounted dive planes (chord section all with end plates). The Hyco vehicles I operated had exactly none of those. Aquarius had one lonely pivoting hymak in the stern, and Leo and the Pisces boats had a pair of side thrusters pivoting on a common shaft. The JSLs had thrusters hanging all over them, so everything was done electrically, and It took a BIG battery to run that thing for 3 to 4 hours max. In any case. all of them had excellent trim systems, and none of them used that trim system for anything beyond initial attitude adjustments and fine buoyancy control in the water column. Long story short, I can tell you without equivocation that a Perry boat would, did, and will run rings around the competition. Ain't saying you can't do it simpler. Just saying that good control makes life easier down there in the cold dark wet places.</div>
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<div>On Monday, December 18, 2023, 05:37:08 PM EST, james hughes via Personal_Submersibles <personal_submersibles@psubs.org> wrote:</div>
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<div dir="ltr">Thank you Alec for that reply! I have a bit more hope now that I can do without those dive planes. I should have also mentioned that I will be adding two trim tanks that should hold about 45 pounds of water each (for "fine tuning" the trim).</div>
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<div dir="ltr">God bless, Jim</div>
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<div>On Monday, December 18, 2023 at 12:05:21 PM PST, Alec Smyth via Personal_Submersibles <personal_submersibles@psubs.org> wrote:</div>
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<div dir="ltr">Hi Jim,<br clear="none">
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<div>That is quite the addition to the fleet, I can't wait to see it in the water! I recall one PSUBBER with a large sub, though not quite as large as yours, who keeps a largish weight inside the cabin. I'm guessing it was maybe 30 lbs, but it was years ago. The weight had a handle on top and carpet glued underneath. He simply slid it forward or aft to trim the boat. Longitudinal trim is very sensitive to weight displacement. For example, a K250 changes trim visibly just when you open the hatch (the weight of the hatch is further aft when open.) With that sort of length to move things around in, I would not expect you to need dive planes.</div>
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<div>Best,</div>
<div>Alec </div>
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<div class="yiv8148155960ydp9f4bb3f8yiv4898649786ydpf10a9265yiv8756270740gmail_attr" dir="ltr">On Mon, Dec 18, 2023 at 2:43 PM james hughes via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank" rel="nofollow noopener noreferrer" shape="rect">personal_submersibles@psubs.org</a>> wrote:</div>
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<div dir="ltr">Hello Gang,</div>
<div dir="ltr">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 <em>old</em> picture to give you a visual of what it looks like (I'll post some new ones soon). <strong><em>Any</em></strong> 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>
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<div dir="ltr">God bless and Merry Christmas to all! Jim</div>
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