<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
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--></style></head><body lang=EN-US link=blue vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Take a look at:</p><p class=MsoNormal><a href="https://www.hunker.com/13407187/how-to-calculate-cfm-from-rpms">https://www.hunker.com/13407187/how-to-calculate-cfm-from-rpms</a></p><p class=MsoNormal>Perry</p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986">Mail</a> for Windows 10</p><p class=MsoNormal><o:p> </o:p></p><div style='mso-element:para-border-div;border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='border:none;padding:0in'><b>From: </b><a href="mailto:warthodson@aol.com">warthodson@aol.com</a><br><b>Sent: </b>Friday, January 24, 2020 5:49 PM<br><b>To: </b><a href="mailto:healeyguy@aol.com">healeyguy@aol.com</a>; <a href="mailto:p_cquinn@tpg.com.au">p_cquinn@tpg.com.au</a><br><b>Cc: </b><a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a><br><b>Subject: </b>Re: [Healeys] Curved/quiet or Straight/efficent</p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>I am confused by the terminology & illustrations on this site. <o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Terminology: <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Pitch = angle of attack. An efficient fan/propeller blade usually has a higher pitch near the hub (center) than at the tip. A blade with a constant pitch is less efficient.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Blade Camber is the equivalent of a wing airfoil. A flat blade = 0 camber is generally less efficient than a blade with a camber/ arch/airfoil. However, the camber has t be appropriate to the application. <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Gary<br><br><o:p></o:p></span></p><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>-----Original Message-----<br>From: Perry via Healeys <healeys@autox.team.net><br>To: Patrick & Caroline Quinn <p_cquinn@tpg.com.au><br>Cc: healeys@autox.team.net <healeys@autox.team.net><br>Sent: Fri, Jan 24, 2020 4:11 pm<br>Subject: Re: [Healeys] Curved/quiet or Straight/efficent<o:p></o:p></span></p><div id=yiv4103211760><div><div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Sir Patrick<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Please peruse the web site at: <a href="https://daviescraig.com.au/blog/straight-vs-curved-fan-blades-dispelling-the-myth" target="_blank">https://daviescraig.com.au/blog/straight-vs-curved-fan-blades-dispelling-the-myth</a><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>They must have the best info on the globe since they are located down under! </span><span style='font-size:10.0pt;font-family:"Segoe UI Emoji",sans-serif;color:black'>😊</span><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Perry<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'>Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986" target="_blank">Mail</a> for Windows 10<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'> <o:p></o:p></span></p></div></div></div></div></div></div></div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial",sans-serif;color:black'><o:p> </o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>