<html><head><base href="x-msg://88/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">fyi,<div>These twisted straps look very much like a water diffuser vanes on the impulse pump of a one Victor Schauberger <a href="http://schauberger.co.uk/home.html">http://schauberger.co.uk/home.html</a></div><div>but that is as far off topic as can be..<div>Richard <br><div><div>On Sep 20, 2013, at 1:57 PM, Crispin Pemberton-Pigott wrote:</div><br class="Apple-interchange-newline"><span class="Apple-style-span" style="border-collapse: separate; font-family: Verdana; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div bgcolor="white" lang="EN-CA" link="blue" vlink="purple"><div class="WordSection1" style="page: WordSection1; "><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Dear Paul<o:p></o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Before rushing to put in the TT’s be aware that such devices in the actual flame will impede combustion quite a bit, producing a lot of soot (clinging to it).<o:p></o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">If the carbon falls into the fire and burns, that might be OK. If, strictly speaking, the purpose is turbulence, it could as well be created with secondary air jets and the soot avoided. Everyone should try it to see the effects.</span><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; "><o:p></o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><img width="473" height="244" id="Picture_x0020_1" apple-width="yes" apple-height="yes" src="cid:image001.jpg@01CEB67E.B28B2100"><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p></o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Because we do not know the gas composition from the stove, it is hard to know what the overall effect of the TTs was on combustion efficiency. This is the sort of effect that is hard to guess.<o:p></o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Regards<o:p></o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Crispin<o:p></o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; ">Frank,<br><br>see below<br><br><o:p></o:p></div></div><blockquote style="margin-top: 5pt; margin-bottom: 5pt; "><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; "><b><span style="font-size: 14pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Surprised to see twisted tape adding efficiency as I would think that would just remove heat that was on its way to the pot. </span></b><o:p></o:p></div></blockquote><div style="margin-top: 0mm; margin-right: 0mm; margin-bottom: 0.0001pt; margin-left: 0mm; font-size: 12pt; font-family: 'Times New Roman', serif; color: black; ">They twisted tape (TT) is quite small and will be up to full temperature quite quickly. After that, they to not remove any more heat. But the added turbulence continues. And seems to have substantial impact. <span class="Apple-converted-space"> </span><br><br>The test of the TT could easily be done in the Rocket stoves that have been tested so many times. Does 1 or more TT have impact there? <span class="Apple-converted-space"> </span><br><br>TT is one of several major designs for turbulence. Looks like an important topic for more study (and does not require fancy expensive equipment.<br><br><o:p></o:p></div></div>_______________________________________________<br>Stoves mailing list<br><br>to Send a Message to the list, use the email address<br><a href="mailto:stoves@lists.bioenergylists.org" style="color: blue; text-decoration: underline; ">stoves@lists.bioenergylists.org</a><br><br>to UNSUBSCRIBE or Change your List Settings use the web page<br><a href="http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org" style="color: blue; text-decoration: underline; ">http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org</a><br><br>for more Biomass Cooking Stoves, News and Information see our web site:<br><a href="http://stoves.bioenergylists.org/" style="color: blue; text-decoration: underline; ">http://stoves.bioenergylists.org/</a><br><br></div></span></div><br></div></div></body></html>