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Old 02-08-2021, 07:30 PM
Jarrett Jarrett is offline
Join Date: Apr 2020
Location: Calgary, Canada
Posts: 36
Default Seat Rib Fluting

Hey folks, on page 26-03 Step 3 the instructions state to flute the lower flanges of the seat ribs in-between the holes called out. As far as I have measured the holes are already aligned with each other, so what is the purpose of the fluting? How much should I be fluting in-between these holes? Thanks!
Calgary, Canada
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Old 02-08-2021, 10:52 PM
n982sx n982sx is online now
Join Date: Apr 2010
Location: Chicago, IL
Posts: 363

Those ribs are formed with a slight curve in that section. The aft section is flat. You simply have to flute to keep the edge straight in the forward section. Line the holes up with the bottom skin to check. Mine took very little fluting.

On the 01415's you will dimple to follow the curve of the skin edge.
Bob Meyers

Built and Flying RV-14A N626KM SN 140093
Built and Flying Sonex N982SX
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Old 02-09-2021, 05:47 AM
Ron B. Ron B. is offline
Join Date: Nov 2007
Location: Yarmouth, Nova Scotia
Posts: 2,490

Just did that yesterday. Position the seat rib on the bottom skin where it belongs and you will see that fluting is required in order for the holes to follow the curve in the hole pattern on the skin. Not difficult to do once you understand the task.
Thanks Ron
RV-14 Flying
AirCam flying
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