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02-20-2012, 02:43 PM
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Join Date: Sep 2006
Location: Port Orange, FL
Posts: 1,020
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I missed the last paragraph of Bruce's post. I agree with Mel that VS and rudder of 7 and 9 are the same. HS and elevator hinge openings are the source of the whistle. I had them covered for a few years until my duct tape fell off. Now I am whistling in the sky again (as Wayne G. has observed).
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Ted Chang, VAF #681
RV-9A #91048, flying since 8/2006. 2,050 hrs.
2018 Due paid
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02-20-2012, 02:45 PM
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Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,118
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How do you cover the holes such that you still have full elevator travel? I assume you're not covering the elevator-HS gap - just the elevator cutouts? Got any pictures?
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2020 dues paid 
N16GN flying 700 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, 430W
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now. 
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02-20-2012, 04:39 PM
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Join Date: Jul 2007
Location: Taylorsville, Ga
Posts: 797
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Horz stab end ribs.
I notice one post indicated that the horiz stabilizer end ribs which have an obvious lightening hole exposed to the elements at times may also be part of the cause. Anyone tried taping just that hole to see if the whistle stopped? That appears quite easy job. Not sure I understand how to tape off the rudder or elevator rod end attachment holes, besides all the other models have same type opening as the 9 on those.
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02-20-2012, 05:44 PM
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Join Date: Dec 2006
Location: Oakland CA
Posts: 771
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the answer is obvious...
...they whistle 'cause they're just happy 
Jeremy Constant |
02-20-2012, 05:53 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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If I had to guess, and this is only a guess, I would suspect the flap hangers.
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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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02-20-2012, 06:02 PM
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Join Date: Jan 2005
Location: Warner Robins, GA
Posts: 1,187
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With just the rudder hinges taped I haven't heard anyone comment about whistling from my plane, but then I never asked anyone to listen for it. Next time I am at the airport I will have someone do just that.
The elevator hinges make sense because the -9 horizontal is bigger and it may make an effective resonator more so than the other, less awesome, RVs.
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Bruce Sacks
RV-9 N659DB - Flying since 7/1/06
Hatz CB-1 - Fabric covering with Polyfiber.
Warner Robins, GA
A&P
APRS KJ4EFS
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02-20-2012, 06:10 PM
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Join Date: Jan 2005
Location: Arkansas
Posts: 1,505
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This may be a silly question but could the whistle also be a source of drag that might effect airspeed. I hope not because I kinda think it's cool.
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Jim Wright
RV-9A N9JW 90919 SoldArkansas
http://www.jimsairplanes.com
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"It's a brutal struggle for the biscuit."
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02-20-2012, 07:01 PM
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Join Date: Sep 2006
Location: Port Orange, FL
Posts: 1,020
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When I had the tape on I only taped the bottom openings (used yellow duct tape to match my paint) to the extend that does not interfere with the down elevator. Yes, it is very easy to test.
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Ted Chang, VAF #681
RV-9A #91048, flying since 8/2006. 2,050 hrs.
2018 Due paid
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02-21-2012, 05:53 AM
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Join Date: Feb 2006
Posts: 359
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Quote:
Originally Posted by rv9aviator
This may be a silly question but could the whistle also be a source of drag that might effect airspeed. I hope not because I kinda think it's cool. |
If its making noise, its making drag!
Never noticed any whistling on my 9. Can't say I've really noticed it on others either. Probably just a little plane to plane variation.
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David Edgemon
RV-9A N42DE
RV-8 N48DE
whats next ??
Track me!
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02-21-2012, 06:50 AM
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Join Date: Jan 2005
Location: Blue Ridge, Georgia
Posts: 247
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Mine doesn't whistle...
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