Van's Air Force

The definitive Van's Aircraft support community! Buying, building or flying an RV? Join our exclusive family of mentors and enthusiasts!

Bottom cowling initial fit - is this normal?

avatty

Well Known Member
Patron
After sweating bullets trimming and fitting the top cowling, I've positioned the bottom cowling and wanted to ask if what I'm seeing is typical.

In the attached photos, the lower edge of the blue tape is aligned with the scribed line and the top edge of the inked line shows the top cowling overlap. The scribed line and the inked line converge at the front of the cowling (top and bottom both trimmed to the scribed lines), at the back there is about a 3/8 inch divergence.

The back face of the bottom cowling is trimmed to the scribed line and overlaps the fuselage side skins by a little less than 3/8 inch, and aligns (almost) exactly with the firewall rivet line.

In other words, I think what I'm seeing is normal, unless I'm pulling upward too hard in the effort to conform the cowling bottom corners to the fuselage bend?

As one more point of reference the untrimmed top edges of the bottom cowling extend to about 3/32 inch above the third rivet head in the fuselage side skin (and just writing this makes me feel like I need a break . . . ).
 

Attachments

  • LB Cowling.jpeg
    LB Cowling.jpeg
    1.6 MB · Views: 152
  • RB Cowling.jpeg
    RB Cowling.jpeg
    1.7 MB · Views: 149
After sweating bullets trimming and fitting the top cowling, I've positioned the bottom cowling and wanted to ask if what I'm seeing is typical.

In the attached photos, the lower edge of the blue tape is aligned with the scribed line and the top edge of the inked line shows the top cowling overlap. The scribed line and the inked line converge at the front of the cowling (top and bottom both trimmed to the scribed lines), at the back there is about a 3/8 inch divergence.

The back face of the bottom cowling is trimmed to the scribed line and overlaps the fuselage side skins by a little less than 3/8 inch, and aligns (almost) exactly with the firewall rivet line.

In other words, I think what I'm seeing is normal, unless I'm pulling upward too hard in the effort to conform the cowling bottom corners to the fuselage bend?

As one more point of reference the untrimmed top edges of the bottom cowling extend to about 3/32 inch above the third rivet head in the fuselage side skin (and just writing this makes me feel like I need a break . . . ).
The bottom cowl is to have its bottom trimmed back first. Then you can get it pushed upward against the belly fully. This may be where your divergence is occurring. Then trim the vertical/firewall edge. Then the horizontal front to rear edge.
 
Back
Top