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<DIV><FONT face=Arial size=2>I admittedly am no rocket scientist but I think it
has to do with the efficiency at the speeds the props spin. Full scale
props are most likely more efficient because they don't cavitate in their own
wake as bad as a model prop does. And model props develop mucho
noise as the tips reach mach speed. I think Bob P. has a prop speed chart
on his website illustrating that. Thus the shape of the tip and
blade is important in our part of keeping them quite as well as creating
efficient thrust. There are people who can convey this idea better then I
can but w</FONT><FONT face=Arial size=2>hy does a larger model fly better then a
smaller one even though it has a higher wing loading? I think the
relationship in prop sizes, full scale vs. model, has a similar
reference.</FONT></DIV>
<DIV><FONT face=Arial size=2>I am told so therefore I am I think.
hmmmmmm!</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>WG</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </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=Richard.Fletcher@gs.com
href="mailto:Richard.Fletcher@gs.com">Fletcher, Richard</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 1:04
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: [SPAM] RE: Unusal
Props</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=380440019-17112004><FONT face=Arial color=#0000ff
size=2>Dean, </FONT></SPAN></DIV>
<DIV><SPAN class=380440019-17112004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=380440019-17112004><FONT face=Arial color=#0000ff
size=2> It is interesting that no other prop manufacturer
has been nearly as successful at marketing this design as APC has. The have
essentially dominated the glow engine prop market. In the giant scale market
this blade style has not shown nearly as much efficiency. The Fuchs line is
semi scimitar in shape and their props work well but other brands with more
traditional designs work as well, or better. I once owned an APC 22X12 three
piece prop and again it was really not much better then a traditional design
wood prop. I wonder why these props work so well at the smaller
sizes?</FONT></SPAN></DIV>
<DIV><SPAN class=380440019-17112004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=380440019-17112004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=380440019-17112004><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=380440019-17112004><FONT face=Arial color=#0000ff
size=2>Rich </FONT></SPAN></DIV>
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<DIV></DIV>
<DIV class=OutlookMessageHeader lang=en-us 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>Dean Pappas<BR><B>Sent:</B> Wednesday, November 17, 2004 1:56
PM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> RE: [SPAM] RE:
Unusal Props<BR><BR></FONT></DIV>
<DIV><SPAN class=998213618-17112004><SPAN class=267095318-17112004><FONT
face=Arial size=2>That's right, and it was a closely held technology until
only a few years before APCs became available.</FONT></SPAN></SPAN></DIV>
<DIV><SPAN class=998213618-17112004><FONT face=Arial
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=998213618-17112004>The benefits of the scimitar shape for
delaying compressibility effects at high prop tip Mach numbers have been
known since WW2. As it turns out, Von proved the value of knowing how to
read!</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 1:44 PM<BR><B>To:</B> discussion@nsrca.org<BR><B>Subject:</B> [SPAM]
RE: Unusal Props<BR><BR></FONT></DIV>
<DIV>I believe the CAD/CAM, software, algorithms, etc used to develop
the technology/process for the APC prop line came from "quiet"
propellers on submarines.</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV> </DIV>
<DIV>Dave Lockhart</DIV>
<DIV><A href="mailto:DaveL322@comcast.net">DaveL322@comcast.net</A></DIV>
<DIV> </DIV>
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Original message -------------- <BR>
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<DIV><SPAN class=399543318-17112004>Dave Von Linsowe was experimenting
with semi-scimitar shaped props at that time, I wonder if APC was
influenced by his efforts.</SPAN></DIV>
<DIV><SPAN class=399543318-17112004></SPAN> </DIV>
<DIV><SPAN class=399543318-17112004></SPAN> </DIV>
<DIV><SPAN class=399543318-17112004></SPAN> </DIV>
<DIV><SPAN class=399543318-17112004>Rich</SPAN></DIV>
<DIV><SPAN class=399543318-17112004></SPAN> </DIV>
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<DIV> </DIV>
<DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><FONT
face=Tahoma>-----Original Message-----<BR><B>From:</B>
discussion-request@nsrca.org [mailto:discussion-request@nsrca.org]
<B>On Behalf Of </B>Rcmaster199@aol.com<BR><B>Sent:</B> Wednesday,
November 17, 2004 1:32 PM<BR><B>To:</B>
discussion@nsrca.org<BR><B>Subject:</B> Re: Unusal
Props<BR><BR></FONT></DIV><FONT id=role_document face=Arial
color=#000000>
<DIV>
<DIV>Yes we do. The semi-scimitar design was a huge departure from the
"Normal". I heard from many "...what an ugly prop.....never will
use.... blah, blah, blah...." among other things. But performance has
silenced everyone.</DIV>
<DIV> </DIV>
<DIV>Matt</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV>In a message dated 11/17/2004 1:24:21 PM Eastern Standard Time,
rcaerobob@cox.net writes:</DIV>
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style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><FONT
style="BACKGROUND-COLOR: transparent" face=Arial color=#000000>
<DIV><FONT face=Arial>Mostly the Rev Ups were used because they made
our motors SING!!! I mean FAST...LOUD...but never went
anywhere.</FONT></DIV>
<DIV><FONT face=Arial> We didn't know
better.</FONT></DIV>
<DIV><FONT face=Arial></FONT> </DIV>
<DIV><FONT face=Arial>Then came MK and Asano....</FONT></DIV>
<DIV><FONT face=Arial>Then this maverick APC thing....Boys, we
remember when THOSE first hit the pits, don't
we??????????</FONT></DIV>
<DIV><BR>Bob Pastorello<BR>NSRCA 199 AMA 46373<BR><A
title=mailto:rcaerobob@cox.net
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A><BR><A
title=http://www.rcaerobats.net/
href="http://www.rcaerobats.net/">www.rcaerobats.net</A></DIV>
<DIV> </DIV>
<DIV> </DIV>
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style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=mailto:perkinsrx@centurytel.net
href="mailto:perkinsrx@centurytel.net">Eddie Batchelor</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=mailto: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 12:18 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: Unusal
Props</DIV>
<DIV><BR></DIV>True It might be that.<BR>I don't think I've
ever seen a prop labeled as to how many blades.<BR>Interesting
thought<BR>I like you're "tlarld"<BR><BR>the prop markings are
like
this<BR>
2<BR> 12 O
5<BR> REV-UP<BR><BR>with
the "O" being the hole in the middle.<BR><BR>It's times like this
I wish the "list" could handle pictures.
<G><BR><BR>Eddie</BLOCKQUOTE></FONT></BLOCKQUOTE></DIV>
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