The Relative Hydrodynamic Resistance of Various Types of Rivet Heads from Tests of Planning Surfaces, Special Report
A 1935 NACA special report on the hydrodynamic resistance of different rivet head types, tested on planning surfaces, published by the NASA Technical Reports Server from the NACA archive for aeronautical and hydrodynamic engineers. The pictures show four test planing surfaces labelled A to D with rows of rivets in varied arrangements, a model planing surface assembled for test, and resistance-versus-speed charts plotted against load and wetted length, offering a designer reference for how fastener profiles and surface detail affect drag.
