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09-08-2014, 09:31 PM
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Join Date: Apr 2011
Location: SF East Bay
Posts: 852
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Filling stall warning holes
I tried searching old threads using various search strings but never found anything.
I have a QB8 wing that has the holes for the stall vane already pre-punched. I will be doing an AOA system (don't know which one yet) so I need to close these holes up. I have some ideas of my own plus some suggestions from local builders but wondered what others have done to close up these holes. Just looking to see how others have done it.
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Sam
RV-8 with the Showplanes Fastback conversion
Emp completed except for glass work
Wings completed except for bottom skin and glass work
Fuselage underway
N18451 reserved
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09-08-2014, 10:47 PM
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Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 5,281
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I am building a 6, so don't have this issue. If you can get access behind, I would rivet on a .025 backing plate and fill with filler. You can use HSRF if you don't think standard polyester filler will be strong enough. The HSRF is very strong with a tenacious bond.
Larry
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09-08-2014, 11:03 PM
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Join Date: Jul 2009
Location: Lee's Summit, MO
Posts: 747
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Holes
Can't you just prepare the holes and put in a rivet?
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Robert Williams
Lee's Summit, MO
RV-8 - Empennage & Wings Done
Working on Fuse
O-360-A1A
1946 Cessna 120
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09-08-2014, 11:24 PM
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Join Date: Dec 2011
Location: Meridian ID, Aspen CO, Okemos MI
Posts: 2,641
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Robert, the hole is about 1"x2" big enough for the stall warning divide to mount and catch air. It will be a job to hide it, but can be done.
Correction - I went and looked at my wings today and the opening is about 3/4 x 3/4.
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rockwoodrv9a
Williamston MI
O-320 D2A
Awaiting DAR Inspection
Last edited by rockwoodrv9 : 09-09-2014 at 01:43 PM.
Reason: error in measurement
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09-09-2014, 12:12 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Perhaps a cut-to-fit flush patch the same thickness as the skin, and a doubler behind it flush riveted to both the patch and the skin?
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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09-09-2014, 08:44 AM
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Join Date: Oct 2005
Location: Estes Park, CO
Posts: 3,931
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Stall switch
Why not install the stall switch and use it as a backup?
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Larry Larson
Estes Park, CO
http://wirejockrv7a.blogspot.com
wirejock at yahoo dot com
Donated 12/03/2019, plus a little extra.
RV-7A #73391, N511RV reserved (2,000+ hours)
HS SB, empennage, tanks, wings, fuse, working finishing kit
Disclaimer
I cannot be, nor will I be, held responsible if you try to do the same things I do and it does not work and/or causes you loss, injury, or even death in the process.
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09-09-2014, 09:21 AM
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Join Date: Oct 2007
Location: In New Braunfels, ist das Leben schön!
Posts: 871
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Quote:
Originally Posted by lr172
I would rivet on a .025 backing plate and fill with filler.
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Exactly what I did about 2 weeks ago. I made the backing plate to fit the existing rivet holes and filled the slot with West Systems epoxy and micro. It's now painted and you can't tell it was ever there.
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Larry New
RV-7A - Flying 900+ hrs
RV-10 - Flying 2.9 hrs
48 States in 7 Days!
VAF Paid - Annual Autodraft
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09-09-2014, 09:42 AM
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Join Date: Jul 2009
Location: Lee's Summit, MO
Posts: 747
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Quote:
Originally Posted by rockwoodrv9
Robert, the hole is about 1"x2" big enough for the stall warning divide to mount and catch air. It will be a job to hide it, but can be done.
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I might be remembering this wrong, but when I received my -8 wing kit the vane opening wasn't pre-punched. The leading edge skin included two small (1/8"?) locator holes for this opening. The vane opening was created by removing the material between these holes. My comment assumed the OP was only filling the locator holes.
Robert
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Robert Williams
Lee's Summit, MO
RV-8 - Empennage & Wings Done
Working on Fuse
O-360-A1A
1946 Cessna 120
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09-09-2014, 09:57 AM
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Join Date: Jan 2005
Location: Clarion, Pennsylvania
Posts: 549
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I am confused.......the opening in the leading edge for the switch is something like 3/8" x 3/4, not 1" x 2. Are we all talking about the same thing here? Or do different models have different switches and openings?
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-Andy Turner
RV-10 N784JC
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09-09-2014, 12:27 PM
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Join Date: Apr 2011
Location: SF East Bay
Posts: 852
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Quote:
Originally Posted by DaAV8R
I might be remembering this wrong, but when I received my -8 wing kit the vane opening wasn't pre-punched. The leading edge skin included two small (1/8"?) locator holes for this opening. The vane opening was created by removing the material between these holes. My comment assumed the OP was only filling the locator holes.
Robert
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This is what I have. Two small (undersized #40) holes in the leading edge that you would open up and connect to make the slot if you were going to install the vane and then some other pre-punched holes trailing back from the leading edge to secure the internal bits of the vane assembly.
Dimpling and filling with rivets is certainly one of the possibilities but wondered if others had come to a more elegant solution.
__________________
Sam
RV-8 with the Showplanes Fastback conversion
Emp completed except for glass work
Wings completed except for bottom skin and glass work
Fuselage underway
N18451 reserved
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