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<DIV><FONT face=Arial size=2>It would be fun, just to see who holds the torch
and who twists the prop....</FONT></DIV>
<DIV><BR>Bob Pastorello<BR>NSRCA 199 AMA 46373<BR><A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR><A
href="http://www.rcaerobats.net">www.rcaerobats.net</A></DIV>
<DIV> </DIV>
<DIV> </DIV>
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<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=d.pappas@kodeos.com href="mailto:d.pappas@kodeos.com">Dean Pappas</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, November 17, 2004 2:23
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: [SPAM] RE: 3-bladed props
for OS160FX</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=914412220-17112004><FONT face=Arial color=#0000ff size=2>Dave
and I are trying to decide if he sings and I dance, or the other way around.
Either way, bring ear-plugs!</FONT></SPAN></DIV>
<DIV><SPAN class=914412220-17112004><FONT face=Arial color=#0000ff
size=2>Sounds reasonable, though.</FONT></SPAN></DIV>
<DIV> </DIV>
<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"><A
href="mailto:d.pappas@kodeos.com">d.pappas@kodeos.com</A></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>randy10926@comcast.net<BR><B>Sent:</B> Wednesday, November 17,
2004 9:45 AM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> [SPAM]
RE: 3-bladed props for OS160FX<BR><BR></FONT></DIV>
<DIV>How about a demo/seminar from the Dave and Dean show at the NATS next
year?</DIV>
<DIV> </DIV>
<DIV>Randy</DIV>
<DIV> </DIV>
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Original message -------------- <BR>
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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>
<DIV> </DIV>
<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>
<DIV> </DIV>
<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>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV><BR>Dave</DIV>
<DIV> </DIV>
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Original message -------------- <BR>
<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>
<DIV> </DIV>
<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>
<DIV><SPAN class=514511421-16112004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<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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