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<DIV style="FONT: 10pt arial">----- Original Message -----
<DIV style="BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A
title=frvondra@cox.net href="mailto:frvondra@cox.net">Frank R. Vondra</A> </DIV>
<DIV><B>To:</B> <A title=Undisclosed-Recipient:;
href="mailto:Undisclosed-Recipient:;">Undisclosed-Recipient:;</A> </DIV>
<DIV><B>Sent:</B> Tuesday, February 04, 2014 8:02 AM</DIV>
<DIV><B>Subject:</B> One of two flying single blade J-2 cubs</DIV></DIV>
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<DIV style="MARGIN-LEFT: 0.5in"><FONT face=Arial><B><U><SPAN
style="FONT-SIZE: 13.5pt">One of two flying single blade J-2
cubs</SPAN></U></B><SPAN> </SPAN><SPAN><U></U><U></U></SPAN></FONT></DIV>
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<DIV style="MARGIN-LEFT: 0.5in"><SPAN><BR></SPAN><FONT face=Arial><B><SPAN
style="FONT-SIZE: 13.5pt">This is super interesting and totally bizarre . . . .
. .</SPAN></B><SPAN> </SPAN><SPAN><U></U><U></U></SPAN></FONT></DIV>
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<DIV style="MARGIN-LEFT: 0.5in"><BR></SPAN><FONT face=Arial><B><SPAN
style="FONT-SIZE: 13.5pt">The idea is that a single blade would be more
efficient than multiple blades because the single blade is always travelling
through undisturbed air. The propeller is counterweighted and mounted
eccentrically on the hub to keep it balanced. It also has fore-aft pivot so the
prop pitch self-adjusts to the most efficient angle - you can move the tip of
the blade forward and back several inches with your hand.</SPAN></B><B><SPAN
style="FONT-SIZE: 10pt"> </SPAN></B></FONT></DIV><FONT face=Arial><B><SPAN
style="FONT-SIZE: 10pt"></SPAN></B></FONT><SPAN>
<DIV style="MARGIN-LEFT: 0.5in"><BR></SPAN><FONT face=Arial><B><SPAN
style="FONT-SIZE: 13.5pt">Apparently the design worked; in 1939 the Everel prop
was tested on a Taylor Craft in a race and won by quite a bit. However, shortly
after the introduction of the prop, powerful 50 </SPAN></B></FONT><FONT
face=Arial><B><SPAN style="FONT-SIZE: 13.5pt">HP engines were developed which
rendered the efficiency gains of the single blade moot. Considering that the
balance of the prop was very fickle in changing weather, the already mechanical
complex prop just wasn't worth the effort, so the design never caught on. It's a
nifty bit of engineering and a cool piece of history.</SPAN></B><SPAN>
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