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06-21-2015, 07:42 AM
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Join Date: May 2009
Location: Fort Mill, South Carolina
Posts: 345
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Alternate air?required?
What's the VAF opinion on installing/omitting the alternate air door? I have an IO-360 with Superior sump in an -8.
Pros & cons?
__________________
Bruce Windom
QB RV-8 N148BW
First Flight: Oct '16
AeroSport Power IO-360 180hp w/dual P-Mags
Catto 3-blade, with black carbon spinner.
10" Dynon SkyviewTouch. That's ALL.
2020 Dues contributed
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06-21-2015, 07:44 AM
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Join Date: Mar 2005
Location: Dallas area
Posts: 10,769
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It is not required but recommended.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
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06-21-2015, 07:58 AM
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Join Date: Oct 2008
Location: Utah
Posts: 8,151
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Make a poll Bruce would be interesting to see how many RVs don't have it.
I don't. 
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06-21-2015, 08:03 AM
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Join Date: Sep 2006
Location: Defiance, MO
Posts: 1,674
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I have had two versions, original magnet and slider. Seemed like the issues were worst then the advantages so permanently bonded a metal plate over the whole thing. Now have none.
I think you should consider having one if you ever fly in snowing conditions (of coarse none of us should fly in known icing conditions)
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Philip
RV-6A - 14+ years, 950+ hours
Based at 1H0 (Creve Coeur)
Paid dues yearly since 2007
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06-21-2015, 08:05 AM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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The convincing argument, for me anyway, is the proverbial plastic bag blowing across the runway at takeoff. That has happened to others and would be a potential disaster for sure. As much of a PITA as it is, I think it is absolutely necessary.
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RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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06-21-2015, 08:08 AM
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Join Date: Apr 2007
Location: Las Vegas, NV
Posts: 118
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I have the identical set up: RV-8, Superior IO-360. After reading several horror stories about the doors coming apart, blowing open, etc. I decided to skip it. It seems to me that it adds as much risk as it alleviates. Take my advice for what it's worth! I'm sure many will disagree!
Mark
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06-21-2015, 08:22 AM
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Join Date: Apr 2012
Location: Tampa (BKV)
Posts: 926
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If there were a leak free, can't fall apart in flight version...I would likely install it. But there isn't. So I haven't. Rv8, superior sump, intake on the ramp.
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RV-8 Flying
1,235th flying RV8
SARL Race#95
SnF Homebuilt Judge
2015 Sun n Fun Kit Built Reserve Grand Champion
2015 Oshkosh Kit Built Champion
2015 Jeffco Kit Built Grand Champion
2014 Oshkosh Outstanding Workmanship Award
Broken Warrior of the Jarhead Clan
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06-21-2015, 08:27 AM
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VAF Moderator / Line Boy
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Join Date: Jan 2005
Location: Dayton, NV
Posts: 12,256
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It is a risk trade - the risk of the intake becoming blocked versus the risk of the door coming apart and FODing the engine. The anecdotal evidence suggest that there are many more cases of the various versions coming apart than there have been blockages (although they HAVE occurred -apparently rarely). I have personally seen so many air boxes that have shaken and vibrated themselves apart that, for me, the blockage is a lower probability than the mechanism failing - so I dont have alternate air doors an any of our current RV's.
Everyone should make their own choice.
__________________
Paul F. Dye
Editor at Large - KITPLANES Magazine
RV-8 - N188PD - "Valkyrie"
RV-6 (By Marriage) - N164MS - "Mikey"
RV-3B - N13PL - "Tsamsiyu"
A&P, EAA Tech Counselor/Flight Advisor
Dayton Valley Airpark (A34)
http://Ironflight.com
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06-21-2015, 08:32 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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I've removed quite a few failed/failing vertical induction alt air doors, a number of them have come in with missing pieces (wonder where that went?). I personally don't have one.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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06-21-2015, 08:38 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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It is possible to build a good alternate air supply.
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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