[prkaye]

Should teh floor ribs be fluted so the webs will lie flat on a table?

 

[lrfrey]

Yes, with the flanges perpendicular.
Larry

 

[thallock]

Depends...

Phil,

Only if you want the holes to line up with the skins.

Tracy.

 

[Jamie]

The rule of thumb is if the bend is a straight bend, there is no need to flute anything. If the bend follows a slight curve then yes, flute them. In the case of the seat ribs, only the bottom flanges need to be fluted because the bottom skin of the fuselage has a slight curve to it.

 

[Steve]

No,

Verify the flange is square to the web, then flute the rib flanges until the holes are in a straight line. The web face will not be flat after fluting.
Steve

 

[alpinelakespilot2000]

Note that the outboard seat ribs have a slight outward bow to them. Those are the only ones I needed to flute.