<html><head></head><body><p dir="ltr">Concur - this is an excellent reference. The only place it falls short is in its addressing of propeller shrouds (Kort nozzles), but then technically these are fairings / hull form surfaces and could be considered outside the scope.</p>
<p dir="ltr">Sean<br>
</p>
<br><br><div class="gmail_quote">swaters@waters-ks.com wrote:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>I would recommend getting the propeller hand book by Dave Gerr. I bought it when I was trying to select a prop for my submarine. It has every calculation and explanation you could ever want in it. </div>
<div>Thanks,</div>
<div>Scott Waters</div>
<div> </div>
<blockquote id="replyBlockquote" style="FONT-SIZE: 10pt; FONT-FAMILY: verdana; COLOR: black; PADDING-LEFT: 8px; MARGIN-LEFT: 8px; BORDER-LEFT: blue 2px solid" webmail="1">
<div id="wmQuoteWrapper">-------- Original Message --------<br />Subject: [PSUBS-MAILIST] prop size<br />From: hank pronk <<a href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>><br />Date: Wed, September 04, 2013 3:58 pm<br />To: Personal Submersibles General Discussion<br /><<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br /><br />
<div style="FONT-SIZE: 12pt; FONT-FAMILY: tahoma, new york, times, serif; COLOR: #000; BACKGROUND-COLOR: #fff">
<div><span><br class="yui-cursor" style="RIGHT: auto" /></span></div>
<div style="FONT-SIZE: 16px; FONT-FAMILY: tahoma, new york, times, serif; RIGHT: auto; COLOR: rgb(0,0,0); FONT-STYLE: normal; BACKGROUND-COLOR: transparent">I have a two part question,</div>
<div style="RIGHT: auto">Is it beneficial to increase my propeller size to increase efficiency. I was under the impression from my boating days that a large slow prop is more fuel efficient. It should increase battery range and slow down the shaft speed, helping the seal.</div>
<div style="RIGHT: auto">I have a much larger prop left over from boating and I am thinking of using it on Gamma</div>
<div style="RIGHT: auto">The next question is,,, is there anyone here with the ability to calculate the new rpm for my given prop size and motor hp.</div>
<div style="RIGHT: auto">Hank<var id="yui-ie-cursor"></var><br style="RIGHT: auto" /></div>
<div style="FONT-SIZE: 12pt; FONT-FAMILY: tahoma, new york, times, serif">
<div style="FONT-SIZE: 12pt; FONT-FAMILY: times new roman, new york, times, serif">
<div dir="ltr">
<div class="hr" contenteditable="false" style="FONT-SIZE: 0px; BORDER-TOP: #ccc 1px solid; HEIGHT: 0px; BORDER-RIGHT: #ccc 1px solid; BORDER-BOTTOM: #ccc 1px solid; PADDING-BOTTOM: 0px; PADDING-TOP: 0px; PADDING-LEFT: 0px; MARGIN: 5px 0px; BORDER-LEFT: #ccc 1px solid; LINE-HEIGHT: 0; PADDING-RIGHT: 0px" readonly="true"></div><font size="2" face="Arial"><b><span style="FONT-WEIGHT: bold">From:</span></b> Jon Wallace <<a href="mailto:jonw@psubs.org">jonw@psubs.org</a>><br /><b><span style="FONT-WEIGHT: bold">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br /><b><span style="FONT-WEIGHT: bold">Sent:</span></b> Wednesday, September 4, 2013 6:18:15 AM<br /><b><span style="FONT-WEIGHT: bold">Subject:</span></b> [PSUBS-MAILIST] There's gold in them-thar waters<br /></font></div>
<div class="y_msg_container"><br /><br /><a href="http://www.usatoday.com/story/news/nation/2013/09/03/florida-family-gold/2757357/" target="_blank">http://www.usatoday.com/story/news/nation/2013/09/03/florida-family-gold/2757357/</a><br />_______________________________________________<br />Personal_Submersibles mailing list<br /><a href="mailto:Personal_Submersibles@psubs.org" target="_blank" ymailto="mailto:Personal_Submersibles@psubs.org">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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