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Old 08-20-2019, 05:18 AM
cccjbr6 cccjbr6 is offline
Join Date: Dec 2013
Location: Birmingham, AL
Posts: 180
Default adding 4th seatback piano hinge

This is a question from a non-builder. We are about to add the Almost 14 Seatback mod which will allow the seat to recline more, but I also want to add more legroom. Is there any reason structurally or otherwise we cannot add a fourth row of piano hinge to the seat pan on both sides to add another 1.5 inches or so of legroom? I don't know what is under the seat pan that might interfere with that new row of rivets. I would appreciate any thoughts and guidance.
Chris Kimble
Birmingham Alabama
RV-6A Bluebird- Beautifully built by Bob Axsom and maintained by Vic Syracuse
$10/month donation gratefully made (worth every penny and painless)
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Old 08-20-2019, 06:40 AM
WingsOnWheels WingsOnWheels is offline
Join Date: Mar 2009
Location: Plano, TX
Posts: 2,137

I found that the seat belt brackets prevent much more aft movement of the seat hinge point. The additional recline does improve legroom as well. I am 6'4" and have long legs. I have the pedals as far forward as they can go, the 14 mod, plus thin back cushions, I fit great.

That said, there is nothing else to proclude adding another hinge. I bought some of the 20 degree bent triagle anchors to improve seat belt geometry.
Colin P.
RV-6A #20603
Complete 5/10/19
I donate every year on my B-Day (in Dec), but donated early in Sep'19.
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Old 09-05-2019, 08:33 PM
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MWH265 MWH265 is offline
Join Date: Feb 2016
Location: Virginia
Posts: 113
Default Adding Hinge

I did it on my 6A. Just on the pilot side. Also did the almost a 14 kit. Seatbelt attach points are very close. You may need to change the attach brackets on the belts. Or, you could just go 1 inch instead of the 1 1/2 that would even space the 4 row. So far no adverse effects. W&B still within envelope.
RV6A Owner/Operator
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Old 09-06-2019, 09:51 AM
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Raymo Raymo is offline
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,321

Easily done but, as mentioned above, the seat belts are the limiting factor. I gained about 1.5" in my -7A with Crow harnesses.
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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