 Ira H. Abbott

Ira H. Abbott was an aerospace engineer whose Langley work connected airfoil geometry, wind tunnel measurements and corrections to aerodynamic data. NASA's institutional profile records his arrival at the Variable Density Tunnel in 1929, subsequent airfoil research and participation in tunnel design. The profile emphasizes that section data do not by themselves determine a complete three-dimensional aircraft wing's behavior.^[ref]

A specific primary contribution is the 1939 report with Eastman N. Jacobs on support interference in the variable-density wind tunnel. Its abstract states that the support effect made earlier drag coefficients and their apparent increase with airfoil thickness too large; the report supplies corrected data and methods. The apparatus supporting a model can alter the flow being measured, so its effect is not established merely by an empty-tunnel zero.^[ref]

For an original arithmetic illustration, stipulate measured drag coefficients of $0.012$ and $0.016$ for two sections, with separately established support corrections of $0.002$ and $0.005$. The corrected values are $0.010$ and $0.011$: the apparent difference falls from $0.004$ to $0.001$. At dynamic pressure $500\mathrm{Pa}$ and a shared reference area of $0.20{\mathrm{m}}^2$, these correspond to corrected drag values of $1.0$ and $1.1\mathrm{N}$. This invented example illustrates the experimental question; it does not replace the report's geometry-dependent correction method with a universal subtraction.