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  #1  
Old 06-18-2016, 09:30 AM
TBoyner TBoyner is offline
 
Join Date: Feb 2009
Location: Stockholm, Sweden
Posts: 2
Question 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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  #2  
Old 06-18-2016, 09:49 AM
DennisRhodes DennisRhodes is offline
 
Join Date: Jul 2007
Location: Taylorsville, Ga
Posts: 798
Default

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!!
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  #3  
Old 06-18-2016, 10:57 AM
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donaziza donaziza is offline
 
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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  #4  
Old 06-18-2016, 11:12 AM
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DaleB DaleB is offline
 
Join Date: Sep 2012
Location: Omaha, NE (KMLE)
Posts: 2,247
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I was gonna say a Corsair...
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Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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  #5  
Old 06-18-2016, 11:49 AM
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mike newall mike newall is online now
 
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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  #6  
Old 06-18-2016, 12:05 PM
don.olandese don.olandese is offline
 
Join Date: Aug 2007
Location: San Antonio, TX
Posts: 193
Default 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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  #7  
Old 06-18-2016, 01:01 PM
krw5927 krw5927 is offline
 
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!
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  #8  
Old 06-18-2016, 01:15 PM
Sledrider Sledrider is offline
 
Join Date: Aug 2011
Location: Ottawa, Canada
Posts: 34
Default Was I Cheated?

My -9A doesn't whistle. Musta done something wrong when I built it. But it flies so nicely!
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Ottawa, Canada
RV-9A C-FSLE - First flight May 7, 2015
Skybolt C-GSLE - built, flown and sold
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  #9  
Old 06-18-2016, 04:34 PM
Turbofan Turbofan is offline
 
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
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91 RV 4
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  #10  
Old 06-18-2016, 05:02 PM
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flightlogic flightlogic is offline
 
Join Date: Nov 2013
Location: Prescott, AZ
Posts: 1,614
Default 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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