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06-18-2016, 09:30 AM
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Join Date: Feb 2009
Location: Stockholm, Sweden
Posts: 2
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Whistling sound in my RV-9A
I have been flying my -9A for 6 years now, and I have enjoyed it for 300 flight hours.
Since the first flight, people on the ground have remarked about a whistling sound from the aircraft when I fly by. I have wondered about he origin of this aerodynamic sound but not really digged too much into it, since you could'nt here it in the plane.
But lately this sound can be heard inside the aircraft, even with my Lightspeed ANR headset on.
A hight pitched tone, which gets higher with more speed, not related to engine RPM or alternator speed. From what I understand it is aerodynamic, possibly coming from an air leak in the tip-up canopy or somewhere else.
I have a thin foam list sealing the canopy to the airframe, which has been a little worn over the years, could a small air leak here produce such an annoying sound?
Or should I start looking somewhere else?
Anybody else out there with similar problems and a solution?
Best regards
Thomas Boyner
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06-18-2016, 09:49 AM
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Join Date: Jul 2007
Location: Taylorsville, Ga
Posts: 798
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Most believe it's from the joint or opening between the horizon tail.surface and elevator. Maybe the hinge opening. Mine whistles as do most 9s . You can place some tape carefully around the openings and minimize it for a test but not recommended for permanent. Gives it character!!
__________________
DRRhodes
2020 VAF Supporter
RV9 N908DR
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06-18-2016, 10:57 AM
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Join Date: Jun 2007
Location: Atlanta
Posts: 745
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Heck, Makes you sound like an F-8 Crusader. 
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06-18-2016, 11:12 AM
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Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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I was gonna say a Corsair... 
__________________
Dale
Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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06-18-2016, 11:49 AM
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Join Date: Jan 2005
Location: Yorkshire, England
Posts: 2,052
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It probably doesn't know the words...... 
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"I add a little excitement, a little spice to your lives, and all you do is complain!" - Q
Donated in 2020
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06-18-2016, 12:05 PM
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Join Date: Aug 2007
Location: San Antonio, TX
Posts: 193
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that whistle on the -9
...has been with me since first flight, and i love it. at reduced throttle settings and slight descents at relatively high speeds it sounds great. folks on the ground usually love it too.
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06-18-2016, 01:01 PM
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Join Date: Aug 2010
Location: Wichita, KS
Posts: 1,958
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I too am the proud driver of a whistling 9A. Just part of the personality of this fine aircraft!
__________________
Kurt W.
RV9A
FLYING!!!
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06-18-2016, 01:15 PM
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Join Date: Aug 2011
Location: Ottawa, Canada
Posts: 34
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Was I Cheated?
My -9A doesn't whistle. Musta done something wrong when I built it. But it flies so nicely!
__________________
Lars
Ottawa, Canada
RV-9A C-FSLE - First flight May 7, 2015
Skybolt C-GSLE - built, flown and sold
Donation sent to DR - 2016
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06-18-2016, 04:34 PM
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Join Date: Oct 2014
Location: Albany,ny area
Posts: 63
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I fly several models of the 737, the older being loud because of poor turbulent airflow over nose and windshield, later models have vortex generators in FRONT of the windshield to energize and change flow possibly streamlining and smoothing airflow over cockpit and windshield, it makes for quieter cockpit....might be a thought for your application.
Tom
__________________
Cub/supercub builder/restorer
39 J3 on floats
53 supercub
47 pa11
91 RV 4
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06-18-2016, 05:02 PM
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Join Date: Nov 2013
Location: Prescott, AZ
Posts: 1,614
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barely there
I can hear the whistle.... just barely, with Lightspeed headsets. Don't mind it and it rarely gets mentioned by groundpounders...
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"Kindness is never a bad plan."
exemption option waived. Donation appropriate.
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