Every aeronautical conversation about airfoils starts with shared vocabulary. This guide names the parts you will see in HFOIL’s geometry view and in every polar report.
Leading edge and trailing edge
The leading edge is the forward stagnation region; the trailing edge is where upper and lower surfaces meet. Closure quality at the trailing edge matters before you trust Cd.
Chord, camber, and thickness
Chord is the straight reference from leading to trailing edge. Camber describes mean-line curvature; thickness is the distance between upper and lower surfaces. Together they set lift, pitching moment, and structural space.
Upper and lower surfaces
Pressure differences between upper and lower surfaces produce lift. In HFOIL, inspect both surfaces in the viewport before you believe a force coefficient.
Engineering takeaway
Name the geometry correctly, then analyse. Vocabulary mistakes become wrong Re, wrong thickness constraints, and wrong mission fits.
How HFOIL helps you act
Open a library airfoil, label the parts in the viewport, then run a first polar. License HFOIL via Contact Us.