Originally Posted by hamblin10
Thanks Scott! It was just strange how it was worded about protecting between the skin and spar cap.
In technical terms (at least in regards to our naming conventions at Van's), the spar cap
is the heavy structure material (in the case of the RV-12, the laminated layers of bars) along the top and bottom edges of the spar.
The spar flange is the flanged portion of the spar channel, that the skins rivet too.
On some aircraft the spar flange and spar cap are the same thing, but that is not the case on any RV wing spar (prior to the RV-15 at least
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Formerly of Van's Aircraft Engineering Prototype Shop
RV-6A (aka "Junkyard Special ")