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<DIV>How about a demo/seminar from the Dave and Dean show at the NATS next year?</DIV>
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<DIV>Randy</DIV>
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<DIV><SPAN class=331373014-17112004><FONT face=Arial color=#0000ff size=2>And now, the Dave and Dean show have spoken ...</FONT></SPAN></DIV>
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<P><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT face="Times New Roman">Kodeos Communications</FONT> <BR><FONT face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT face="Times New Roman">d.pappas@kodeos.com</FONT> </P>
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<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B> discussion-request@nsrca.org [mailto:discussion-request@nsrca.org]<B>On Behalf Of </B>DaveL322@comcast.net<BR><B>Sent:</B> Wednesday, November 17, 2004 9:22 AM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> RE: 3-bladed props for OS160FX<BR><BR></FONT></DIV>
<DIV>...and a further variable....</DIV>
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<DIV>It is quite difficult to measure the pitch of the prop without knowing the zero angle of attack of the airfoil used on the prop (which often changes along the span of the prop). So the pitch reading from a pitch gauge is really just a reference. For the most part, I've found that reducing the pitch of an APC close to the root results in a fairly equal reduction along the span of the prop (as measured on a Prather pitch gauge).</DIV>
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<DIV>Regards,</DIV>
<DIV><BR>Dave</DIV>
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<DIV> I guess if you want to maintain a true helical pitch, if you are reducing the pitch then you will need to add some pitch back towards the tips. Higher pitch props have more twist along the blade than lower pitch props. So if you depitch at one point towards the root, then you end up with a blade that effectively has washout. Correct? That may be good for our purpose.</DIV>
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<DIV>Bob.</DIV>
<DIV><BR><BR><B><I>Dean Pappas <d.pappas@kodeos.com></I></B> wrote:</DIV>
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<DIV><SPAN class=514511421-16112004><FONT face=Arial color=#0000ff size=2>Claudio,</FONT></SPAN></DIV>
<DIV><SPAN class=514511421-16112004><FONT face=Arial color=#0000ff size=2>Ideally you would twist the prop at several places to acheiv helical pitch. In practice, this is entirely unnecessary. Twist once, as close to the hub as practical, and that will work just fine. I see that Dave L added more detail to the procedure.</FONT></SPAN></DIV>
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<DIV><SPAN class=514511421-16112004><FONT face=Arial color=#0000ff size=2>until later,</FONT></SPAN></DIV>
<DIV><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT face="Times New Roman">Kodeos Communications</FONT> <BR><FONT face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT face="Times New Roman">d.pappas@kodeos.com</FONT> </DIV>
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