|Quoting amccann (Reply 1):|
Did you happen to see the outside of the airplane? Or possibly the tail number? If you caught either of those you could look at pictures and determine if there is an external doubler on the RHS. However without tail number, I would still imagine if there is a large amount of rivets on the RHS and not the LHS, in presumably an area that sees equal loads on the RHS and LHS there is probably an external doubler on the RHS.
Rivet spacing, also referred as rivet pitch, is the distance between the rivets in the same row, and is measured from the rivet center to the rivet center.Transverse pitch is the distance between the rows of rivets, and is measured from the rivet center to rivet center. Edge distance is the distance from the center of the rivet to the edge of the material being riveted. There are no specific rules that apply to every case or type of riveting. There are, however, certain general rules that should be followed.
RIVET SPACING.— Rivet spacing (pitch) depends upon several factors, principally the thickness of the sheet, the diameter of the rivets, and the manner in which the sheet will be stressed. Rivet spacing should never be less than three times the rivet diameter. Spacing is seldom less than four times the diameter nor more than eight times the diameter.
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