<p dir="ltr">Hi Brian,<br>
>From my experience driving my dive club's (2t) boat with twin engines, using them to steer is not very effective at all. And thinking about it, to turn, the stern needs to have a sideways force on it, which is only very marginal from a straight drive shaft, i.e. imagine holding even a small boat at the stern in the water and and trying to pivot it around the stern. Much harder than trying to push the stern sideways to turn it.</p>
<p dir="ltr">Cheers,<br>
Steve</p>
<div class="gmail_quote">On 09/12/2014 8:25 AM, "Brian Cox via Personal_Submersibles" <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="font-family:Arial,sans-serif;font-size:10pt"><div>Hi Alan,</div><div>                I do have a model, but the sub has evolved a bit from when I made the model.  At this point I'm basically committed to my design and I'll have to work with what I have.  It's all good, can't wait to play with it, my welder did another viewport flange yesterday, and I have another guy finishing up the conning tower..</div><div> </div><div>Brian<br><br>--- <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a> wrote:<br><br>From: Alan James via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] U joint prop<br>Date: Mon, 8 Dec 2014 19:04:52 +0000 (UTC)<br><br></div><div style="color:rgb(0,0,0);font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px;background-color:rgb(255,255,255)"><div dir="ltr"><span>Hi Brian,</span></div><div dir="ltr"><span>are the motors near the middle of the sub?</span></div><div dir="ltr"><span>You will be able to turn a lot easier if they are.</span></div><div dir="ltr"><span>You could always make a scale model & push it at the point of the motor placement </span></div><div dir="ltr"><span>& see how easily it turns.</span></div><div dir="ltr"><span>Alan</span></div><br>  <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div style="font-family:HelveticaNeue,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:16px"> <div dir="ltr"> <hr size="1">  <font face="Arial"> <b><span style="font-weight:bold">From:</span></b> Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br> <b><span style="font-weight:bold">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> <br> <b><span style="font-weight:bold">Sent:</span></b> Tuesday, December 9, 2014 7:18 AM<br> <b><span style="font-weight:bold">Subject:</span></b> Re: [PSUBS-MAILIST] U joint prop<br> </font> </div> <div><br>No, I'm running shafts back along each bottom sides of the sphere.  I found an area between the body of my ballast structure and the sphere where there is space to tuck in the motors nicely and still keep everything with in the profile.  I still may put some rudders on if I can't turn the thing.<br><br>Brian   <br><br>--- <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a> wrote:<br><br>From: hank pronk via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>To: Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br>Subject: Re: [PSUBS-MAILIST] U joint prop<br>Date: Mon, 8 Dec 2014 08:09:44 -0800<br><br>Brian,<br>If your motors are in cans, can't you turn the can?<br>Hank<br>--------------------------------------------<br>On Mon, 12/8/14, Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>> wrote:<br><br> Subject: Re: [PSUBS-MAILIST] U joint prop<br> To: "Personal Submersibles General Discussion" <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br> Received: Monday, December 8, 2014, 10:03 AM<br> <br> That's probably the reason I've never<br> seen one.  I'm hoping that with two props I'll be able<br> to turn by just running one prop or the other.  <br> <br> Brian<br> <br> --- <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a><br> wrote:<br> <br> From: Marc de Piolenc via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a>><br> To: <a href="mailto:personal_submersibles@psubs.org" target="_blank">personal_submersibles@psubs.org</a><br> Subject: Re: [PSUBS-MAILIST] U joint prop<br> Date: Mon, 08 Dec 2014 10:11:37 +0800<br> <br> One U-joint causes a 1/rev vibration which can be quite<br> severe. To get <br> smooth action, you need a pair of U-joints, and the input<br> and output <br> shafts need to be parallel.<br> <br> That, or you need to substitute a constant-velocity joint<br> for the U-joint.<br> <br> Marc<br> <br> On 12/8/2014 9:11 AM, Brian Cox via Personal_Submersibles<br> wrote:<br> >      Has anyone ever had any experience<br> or seen a propeller that can<br> > change orientation using a U joint at the end of the<br> propeller shaft?<br> > If could just get 15 degrees or so I might be able to<br> eliminate my<br> > rudder assembly altogether.<br> > Brian<br> ><br> ><br> > _______________________________________________<br> > Personal_Submersibles mailing list<br> > <a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br> > <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br> ><br> <br> -- <br> Archivale catalog: <a href="http://www.archivale.com/catalog" target="_blank">http://www.archivale.com/catalog</a><br> Polymath weblog: <a href="http://www.archivale.com/weblog" target="_blank">http://www.archivale.com/weblog</a><br> Translations (ProZ profile): <a href="http://www.proz.com/profile/639380" target="_blank">http://www.proz.com/profile/639380</a><br> Translations (BeWords profile): <a href="http://www.bewords.com/Marc-dePiolenc" target="_blank">http://www.bewords.com/Marc-dePiolenc</a><br> Ducted fans: <a href="http://massflow.archivale.com/" target="_blank">http://massflow.archivale.com/</a><br> _______________________________________________<br> Personal_Submersibles mailing list<br> <a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br> <br> <br> _______________________________________________<br> Personal_Submersibles mailing list<br> <a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br> <a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br> <br><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a href="mailto:Personal_Submersibles@psubs.org" target="_blank">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div>  </div>_______________________________________________
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