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I know we're supposed to be flying, but I'm still motor-less...but getting there...</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0"> A question for anyone who knows....what is the procedure for installing scoops/baffles on the cowling to cool the main bearing?</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0"> Is there experience to justify putting them on the OS/Mintor/Webra larger two strokes?</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0"> Any websites with "how to" info?</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0"> Do baffles/scoops lengthen bearing life and reduce heat???</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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I am using "Nostrils" on Alliance's nose (top of fuse) to help with cooling airflow directly at the crankcase bottom. I also use a header scoop originally intended for the YS 140 header, to good advantage for the Webra's pipe. It's a fully enclosed belly set-up therefore it needs the airflow.<BR>
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These are simple glass/balsa additions carved to fit the fuse top and belly pan side. The entry areas are approximately 4 sq cm each nostril, and about 6 sq cm for the header scoop. Main air cooling comes from the front pan opening, which completely covers the cylinder.<BR>
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Note that the cowl is fairly close fitting around the engine so additional internal baffles for air redirection are not used and are not needed in my plane. But some have reported adding redirectors inside the large cowlings of models like Smaragd or Partner to get adequate cooling.<BR>
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As far as longer life out of the bearings, the Webra is still going after 220 flights and bearing still smooth. We'll see how long bearing lasts<BR>
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matt Kebabjian</FONT></HTML>