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07-09-2017, 03:30 PM
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Join Date: Jun 2015
Location: Boulder, CO
Posts: 130
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Doubler needed for 120mm defrost fans?
Hey folks,
I've decided to install 2 120mm defrost fans in a spot very similar to Brian and Brandi's:
Do y'all suggest installing a doubler around these holes on the underside of the skin? An .032" doubler with a single row of rivets and corner holes for the #8 screws doesn't feel overkill, but a 1" thick doubler like Vans suggests for the radio stack hole DOES feel overkill.
What are other people installing here to support their fans?
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07-09-2017, 04:52 PM
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Join Date: Oct 2008
Location: Carson City, NV
Posts: 493
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Pretty large fans. Mine are much smaller, and lighter and don't see any need for a doubler. Don't need to move much air to be effective.
__________________
Joel
N626JA
RV-7A at CXP
Flying!
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07-09-2017, 05:38 PM
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Join Date: Jun 2007
Location: new iberia la
Posts: 768
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Doublers
I installed fans this size in 2 different Slider 9's. Since I wasn't able to do the structural analysis myself (and it is structure) I used the repair patch part of 43:13 as a guide. The doubler was about 1" wide and got a double row of flush 3/32 rivets. Also made my own "grille" by drilling a hole pattern in a square of .032" which will add in a bit of strength as well. If I'm going to go off the plans a little overkill that hardly weighs anything works for me.
Don Broussard
RV9 Rebuild in Progress
57 Pacer
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07-09-2017, 06:46 PM
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Join Date: Jun 2010
Location: Sunman, IN
Posts: 2,189
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Fans
I used the 120s and put a 1" doubler in place with flush rivets...
__________________
Bob
Aerospace Engineer '88
RV-10
Structure - 90% Done
Cabin Top - Aaarrghhh...
EFII System 32 - Done
297 HP Barrett Hung
ShowPlanes Cowl with Skybolts Fitted - Beautiful
Wiring...
Dues+ Paid 2019,...Thanks DR+
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07-10-2017, 09:44 PM
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Join Date: Jun 2015
Location: Boulder, CO
Posts: 130
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Quote:
Originally Posted by rocketman1988
I used the 120s and put a 1" doubler in place with flush rivets...
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I ended up doing this as well, with a 0.75" doubler to accomodate the fan flange. Here's the result:
It was obvious when I finished sanding out the cut that it needed a doubler. With just the doubler it's nice and still again, and especially with the fan in place it feels great. Thanks all!
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07-11-2017, 08:37 AM
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Join Date: Jan 2016
Location: Sugar Land, TX
Posts: 406
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I also installed 120mm fans in this location. I purchased the mounting plates shown at: https://www.newegg.com/Product/Produ...0009-_-Product
This grill made for a very easy install, and comes with both a very solid square aluminum plate (doubler) and a nice grill to fit the round hole. I used flat head screws to mount the plate, and can either leave it open for natural ventilation, or can mount the fans for forced ventilation which is my intent.
__________________
Dave Macdonald
RV-10 First Flight April 1, 2020.  Currently in Phase 1
2020 VAF Dues Paid
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07-11-2017, 09:32 AM
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Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,597
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No grill, no backing plate option
An option is to not use a grill at all, just drill an interesting pattern of holes in the glare shield instead of one big square hole. This strengthens the area so no backer plate is needed, and eliminates the ugly grill.
Sorry, didn't set up for photos but is anyone wants them PM me your email address.
Carl
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07-11-2017, 12:08 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Quote:
Originally Posted by Carl Froehlich
An option is to not use a grill at all, just drill an interesting pattern of holes in the glare shield instead of one big square hole. This strengthens the area so no backer plate is needed, and eliminates the ugly grill.
Sorry, didn't set up for photos but is anyone wants them PM me your email address.
Carl
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+1. This is what I did. No flex in the glare shield. (In the -10 this is best done prior to installing the windscreen, depending on the exact location of the fan).
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07-11-2017, 12:36 PM
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Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,189
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Quote:
Originally Posted by Carl Froehlich
An option is to not use a grill at all, just drill an interesting pattern of holes in the glare shield instead of one big square hole. This strengthens the area so no backer plate is needed, and eliminates the ugly grill.
Sorry, didn't set up for photos but is anyone wants them PM me your email address.
Carl
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+2. Drilled some holes for airflow.

__________________
Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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07-11-2017, 01:24 PM
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Join Date: Jun 2017
Location: Naples FL
Posts: 147
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Carl's fan install

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