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Tip clearances according to Skene's is 10% of Prop Diameter for a
2 blade, 15% of Prop Diameter for a 3 blade.
<BR>I.e. A 10" prop dia requires a 1.5" tip clearance minimum, for a 3
blade, from any part of the boat or aperture in that plane.
<BR>Cheers,
<BR>John
<P>Bob Lincoln wrote:
<BLOCKQUOTE TYPE=CITE><TT>From:</TT> <TT>"Bob Lincoln" <lincoln@cc.UManitoba.CA></TT>
<BR> <SPAN class=897590616-17012000><FONT FACE="Arial"><FONT COLOR="#0000FF">A
web site regarding propeller selection is ...www.properpitch.com.
Generally speaking the Atomic 4 direct drive uses a smaller pitch and has
a higher rpm than diesels on the A30 that have a reduction gear similar
to yours. Check your engine specs to determine at what rpms you develop
maximum horsepower, and go from there. The older design books also
suggest what tip clearances you should have in the prop aperture.</FONT></FONT></SPAN><SPAN class=897590616-17012000><FONT FACE="Arial"><FONT COLOR="#0000FF">Bob
Lincoln</FONT></FONT></SPAN><SPAN class=897590616-17012000><FONT FACE="Arial"><FONT COLOR="#0000FF">Indigo
590</FONT></FONT></SPAN>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader><FONT FACE="Times New Roman"><FONT SIZE=-1>-----Original
Message-----</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=-1><B>From:</B> Peter Amos
[<A HREF="mailto:P.A.Amos@tesco.net">mailto:P.A.Amos@tesco.net</A>]</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=-1><B>Sent:</B> Sunday, January
16, 2000 1:51 AM</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=-1><B>To:</B> Alberg 30</FONT></FONT>
<BR><FONT FACE="Times New Roman"><FONT SIZE=-1><B>Subject:</B> [alberg30]
A30 props</FONT></FONT>
<BR> </DIV>
<TT>From:</TT> <TT>"Peter Amos" <P.A.Amos@tesco.net></TT><SPAN class=897590616-17012000><FONT FACE="Arial"><FONT COLOR="#0000FF"><FONT SIZE=+0>[Bob
Lincoln commented:] ... </SPAN></FONT></FONT></FONT><FONT SIZE=-1>Is
there a site that gives prop sizes for boat and power combinations?</FONT><FONT SIZE=-1>Peter
Amos "Tait Tait" 478</FONT>
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