[NSRCA-discussion] 4 blade spinner

[DaveL322 at comcast.net]

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.

The 15.5-12 4b will work, but vertical is not nearly as good as the 10" 3b or 18.1x10.1 2b.

Regards,

Dave

-------------- Original message -------------- 
From: "Dr. Mike Harrison" <drmikedds at sbcglobal.net> 

> 2 things I recommend are adding an additional head shim so that there are 2 
> head shims and lengthening the pipe a couple of inches from the standard 
> setup. I use the OS F plug and 20% pro blend Cool Power. 
> We have recently found the idle needs to be pretty lean. 
> I get very strong performance and very smooth transition. 
> One more thing, be sure to change the rear bearing to the EFI bearing. This 
> can be purchased from Tower Hobbies. 
> 
> The key to quiet engine performance is not to trun too much rpm with the 
> 18.1x10w. The plane will be very quiet and have great power if you are 
> turning 8000rpm or less. 
> 
> 
> Mike 
> ----- Original Message ----- 
> From: "wgalligan" 
> To: "NSRCA Mailing List" 
> Sent: Tuesday, November 21, 2006 7:50 AM 
> Subject: Re: [NSRCA-discussion] 4 blade spinner 
> 
> 
> >I think you will find the 18.1x I0W APC To be a good prop for that engine. 
> > 
> > Wayne Galligan 
> > 
> > ----- Original Message ----- 
> > From: "Kelly Regan" 
> > To: 
> > Sent: Monday, November 20, 2006 9:39 PM 
> > Subject: [NSRCA-discussion] 4 blade spinner 
> > 
> > 
> >>I am getting ready to order the last few items for my 140RX 
> >> powered Brio. 
> >> 
> >> I read some good things about the APC 15.5 x 12 4 blade 
> >> prop and thought I would give that a try. 
> >> 
> >> My problem is I don't see a 4 blade spinner in 3 3/8" or 3 /1/2" 
> >> that will fit the Brio. 3" looks way to small and I think it might 
> >> look funny on the Brio. 
> >> 
> >> Any idea's ? 
> >> 
> >> 
> >> -- 
> >> ______________________________________________ 
> >> 
> >> Kelly Regan 
> >> www.reganbrothers.com 
> >> Home Page: http://mysite.verizon.net/vze6uror/ 
> >> ______________________________________________ 
> >> 
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> >> 
> >> 
> > 
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> 
> 
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