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<DIV>Ditto on the extra headshim, 20%, OS-F, EFI bearing, longer pipe, and propping for 7500 - 7800. I ran the RX and EFI this way fo 5 years. On the RX in particular, what pipe and what length will have a pretty dramatic effect on the peak power and midrange transition, and to a lesser extent, the "best" idle mixture (the idle mixture has some effect on the midrange transition up to about 1/3 throttle). The idle compromise is usually this - richer is better for spool down and braking, but leaner is better for midrange transition.</DIV>
<DIV> </DIV>
<DIV>The 15.5-12 4b will work, but vertical is not nearly as good as the 10" 3b or 18.1x10.1 2b.</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV><BR>Dave</DIV>
<DIV> </DIV>
<BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">-------------- Original message -------------- <BR>From: "Dr. Mike Harrison" <drmikedds@sbcglobal.net> <BR><BR>> 2 things I recommend are adding an additional head shim so that there are 2 <BR>> head shims and lengthening the pipe a couple of inches from the standard <BR>> setup. I use the OS F plug and 20% pro blend Cool Power. <BR>> We have recently found the idle needs to be pretty lean. <BR>> I get very strong performance and very smooth transition. <BR>> One more thing, be sure to change the rear bearing to the EFI bearing. This <BR>> can be purchased from Tower Hobbies. <BR>> <BR>> The key to quiet engine performance is not to trun too much rpm with the <BR>> 18.1x10w. The plane will be very quiet and have great power if you are <BR>> turning 8000rpm or less. <BR>> <BR>> <BR>> Mike <BR>> ----- Original Message ----- <BR>> From: "wgallig
an" <WGALLIGAN@GOODSONACURA.COM><BR>> To: "NSRCA Mailing List" <NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>> Sent: Tuesday, November 21, 2006 7:50 AM <BR>> Subject: Re: [NSRCA-discussion] 4 blade spinner <BR>> <BR>> <BR>> >I think you will find the 18.1x I0W APC To be a good prop for that engine. <BR>> > <BR>> > Wayne Galligan <BR>> > <BR>> > ----- Original Message ----- <BR>> > From: "Kelly Regan" <KELLY.REGAN2@VERIZON.NET><BR>> > To: <NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>> > Sent: Monday, November 20, 2006 9:39 PM <BR>> > Subject: [NSRCA-discussion] 4 blade spinner <BR>> > <BR>> > <BR>> >>I am getting ready to order the last few items for my 140RX <BR>> >> powered Brio. <BR>> >> <BR>> >> I read some good things about the APC 15.5 x 12 4 blade <BR>> >> prop and thought I would give that a try. <BR>> >> <BR>> >> My problem is I don't see a 4 blad
e spinner in 3 3/8" or 3 /1/2" <BR>> >> that will fit the Brio. 3" looks way to small and I think it might <BR>> >> look funny on the Brio. <BR>> >> <BR>> >> Any idea's ? <BR>> >> <BR>> >> <BR>> >> -- <BR>> >> ______________________________________________ <BR>> >> <BR>> >> Kelly Regan <BR>> >> www.reganbrothers.com <BR>> >> Home Page: http://mysite.verizon.net/vze6uror/ <BR>> >> ______________________________________________ <BR>> >> <BR>> >> _______________________________________________ <BR>> >> NSRCA-discussion mailing list <BR>> >> NSRCA-discussion@lists.nsrca.org <BR>> >> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion <BR>> >> <BR>> >> <BR>> > <BR>> > _______________________________________________ <BR>> > NSRCA-discussion mailing list <BR>> > NSRCA-discussion@list
s.nsrca.org <BR>> > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion <BR>> > <BR>> <BR>> <BR>> _______________________________________________ <BR>> NSRCA-discussion mailing list <BR>> NSRCA-discussion@lists.nsrca.org <BR>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion </BLOCKQUOTE></body></html>