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07-07-2008, 11:38 AM
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Join Date: May 2005
Location: Canby, Oregon
Posts: 1,786
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Great testing Bryan
Have you noticed heating effects on the fiberglass of your new fairing from the exhaust pipes?
Kent
__________________
Kent Byerley
RV9A N94KJ - IO320, CS, tipup
AFS 3500, TT AP, FLYING....
Canby, Or
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07-07-2008, 08:59 PM
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Join Date: Aug 2006
Posts: 114
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Cooling exit area fairing
As you can see in version 1 the exhaust actually charred the fiberglass a little bit. In version 1.5 I modified the version 1 fairing to decrease angle of the exit and made both exits a bit wider. I also covered the exits in stainless to avoid the buring problem b/c the exhaust was so close. In version 2 the middle section from version 1.5 was removed completely making only 1 exit. At the time I didn't have any more stainless and the new exit angle moved the glass much futher away from the exhaust pipe so I just tried it w/o the stainless covers. Turns out the stainless seems not to be needed anymore. I have est. 4+ hours flight time on the new fairing and there are no signs of any charring of the glass. Of course once again, as I have said before, I need to fly around more before I make any promises, but I'm guessing it will not be an issue. The fairing glass is generally now further away from the exhaust pipe than the glass in the cowl and the exhaust gases themselves are not exiting the exhaust pipe and acting as directly on the glass as before. In fact I am defitinely tempted to cut my exhaust pipes parallel to the airflow but I haven't yet, mostly b/c I have mixed feelings about doing so.
Bryan
Last edited by bryanflood : 07-07-2008 at 09:03 PM.
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07-07-2008, 11:15 PM
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Join Date: Jan 2005
Location: Port Angeles, Wash
Posts: 373
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exhaust pipes
I cut my exhaust pipes back a bit so the pipes wouldn't hang out in the wind and to get some "thrust" by having them exhaust back. I noticed about 1-2mph gain in speed. However, there was more vibration in the flooring and I had a lot more soot to clean off the belly than before. I like your fairing and will be curious to see if it gains you any speed. I would suspect that if the flow is not turbulant coming out of the cowling exit and the air stays attached, then cooling drag should be reduced and temps should come down. I am planning a mod on my RV-6 to cut out the 90 degree bend on the firewall and but something like the RV-8 has to smooth out the air coming out of the cowling. I will have to fab up something to go over the bottom engine mount tube. I take it if your fairing works out then you will make a mold and be selling fairings to the rest of us! 
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02-18-2009, 03:52 PM
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Join Date: Mar 2006
Location: mn
Posts: 51
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exit mod.
Found something on the Lancair site, regarding cutting off the exh. to make a more direct aft exit to the pipe. two pieces of stainless were welded to each side of the last 3in of pipe and joined by a cap between the two ---__--- invert this and put a circle in the center which is the pipe. This eliminated the exh. stain on the belly and the vibration in the floor. Worth a try.
Walt RV-6
IO-320 CS finishing up
Last edited by buck : 02-18-2009 at 03:54 PM.
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05-21-2009, 10:09 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Bryan,
How's the testing coming?
Did this mod change your CHT's and oil temps any?
I was also wondering if you continued the fiber glass inside the cowling to help guide the exit air over the lip on the bottom of the firewall?
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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05-22-2009, 04:57 AM
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Join Date: Mar 2006
Location: Gilbert, AZ
Posts: 1,628
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Quote:
Originally Posted by N941WR
Bryan,
That is a great idea. Keep us posted on what you find. With only 135 HP, I would be very interested in simple speed mods.
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Bill,
Simple speed mod.... bigger engine!
__________________
Ron Schreck
IAC National Judge
RV-8, "Miss Izzy", 2250 Hours - Sold
VAF 2021 Donor
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05-22-2009, 07:47 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by ronschreck
Bill,
Simple speed mod.... bigger engine!
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Simpler speed mod... Dump the climb prop for a cruise prop.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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05-22-2009, 01:01 PM
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Join Date: Dec 2007
Location: Aubrey, TX
Posts: 358
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Noise/vibration
Bryan,
Have you noticed and noise/vibration improvements?
__________________
Dean Eiland
Aubrey, TX
Former Vice President EAA Chapter 1246
RV-9 (yes) N369RV
Mattituck IO-360, C/S Whirl Wind Prop, GRT, Digiflight II, Garmin SL30 & GTX 330 and Hotel Whisky Aux tanks, Bla Bla Bla
Flying
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11-02-2009, 11:07 AM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by N941WR
Bryan,
How's the testing coming?
Did this mod change your CHT's and oil temps any?
I was also wondering if you continued the fiber glass inside the cowling to help guide the exit air over the lip on the bottom of the firewall?
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Bryan,
Any updates?
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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11-02-2009, 07:32 PM
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Join Date: Jan 2009
Location: Northern California
Posts: 153
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Quote:
Originally Posted by N941WR
Simpler speed mod... Dump the climb prop for a cruise prop.
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Not necesarily so. More rpms mean more hp for the same MP. If a prop is effiecient at higher rpms it wil go faster.
My climp prop is my race prop, Faster than my cruise prop @ compairable altitudes altho with higher rpms.
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