<html><head></head><body><div class="ydpaf5c41bbyahoo-style-wrap" style="font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 13px;"><div id="ydpaf5c41bbyiv2355058101"><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;" class="ydpaf5c41bbyiv2355058101ydpc3bcbf9fyahoo-style-wrap"><div></div>
<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><div dir="ltr"><br></div><div dir="ltr" data-setdir="false">God bless, Jim</div><div><br clear="none"></div>
</div><div id="ydpaf5c41bbyiv2355058101yahoo_quoted_3537911866" class="ydpaf5c41bbyiv2355058101yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
</div>
</div></div></div></div><div id="yiv2355058101yqt71092" class="yiv2355058101yqt3986129147"><div>
On Monday, December 18, 2023 at 12:05:21 PM PST, Alec Smyth via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
</div>
<div><br clear="none"></div>
<div><br clear="none"></div>
<div><div id="yiv2355058101"><div><div dir="ltr">Hi Jim,<br clear="none"><div><br clear="none"></div><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><div><br clear="none"></div><div>Best,</div><div>Alec </div></div><br clear="none"><div class="yiv2355058101gmail_quote"><div id="yiv2355058101yqt75304" class="yiv2355058101yqt3694629760"><div dir="ltr" class="yiv2355058101gmail_attr">On Mon, Dec 18, 2023 at 2:43 PM james hughes via Personal_Submersibles <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;" class="yiv2355058101gmail_quote"><div><div style="font-family:Helvetica, Arial, sans-serif;font-size:13px;"><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 <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"><br clear="none"></div><div dir="ltr">God bless and Merry Christmas to all! Jim</div></div></div>_______________________________________________<br clear="none">
Personal_Submersibles mailing list<br clear="none">
<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none">
<a rel="nofollow noopener noreferrer" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none">
</blockquote></div></div>
</div></div><div id="yiv2355058101yqt24425" class="yiv2355058101yqt3694629760">_______________________________________________<br clear="none">Personal_Submersibles mailing list<br clear="none"><a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br clear="none"><a rel="nofollow noopener noreferrer" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br clear="none"></div></div></div></body></html>