Fuse Section 29, Page 14, Steps 4-8: Question on Steel edge distances

[RV6-KPTW]

Hey all,

When match drilling firewall brackets to fuselage channels – ex: WD-1003 to F-1041-L and R, the fuselage channel web edge distances are fine, >=2D.

Drilling the holes from the flanges of the channel into the two steel bracket arms perpendicular to the web will be less than 2 diameters.

Is this a problem or a common experience and acceptable?

The photo shows marks on the firewall bracket from the assembled parts and does not reflect accurately how close a drilled hole might come to the edge. It was a marked from a weird angle.

Thanks

 

[kirkbauer]

My understanding is that the minimum edge distance for steel is less than that on aluminum. Specifically steel is 1.5x diameter, and that is measured from the center of the hole, so in other words only 1x diameter from the edge of the hole to the edge of the steel. I did some searching, though, and I can't find anything definitive on that. It seems to be a rule of thumb, but please don't take my word for it. Perhaps worth reaching out to Van's to ask.

On the RV-10 wiki page it mentions an edge distance of 1/8" for this step.

 

[RV6-KPTW]

In the end, it turned out just fine following the RV10 wiki advice.

Thanks