Air deflectors on trucks/lorries

[JulianEdgar]

Originally Posted by Piotrsko

Gotta stop using those fat ugly gottengen style windmill blade profiles and at least use something like a Selig 737 tailfeather airfoil which are less sensitive to angle of attack and have a lower cd.

I'd be happy to experiment with different aerofoil profiles if you can find another so cheap and easy to use (eg another extruded aluminum one). The other extrusions I can fine are just generic ie no aero data.

[j-c-c]

Originally Posted by freebeard

I suspect that the leading and trailing edges are significant, but thickness mid-chord isn't.

I agree, but it must also be symmetrical, and chord length at some point becomes a factor in whatever the mid chord thickness is chosen.

All meaning to me, the thinnest possible at the requisite strength is the goal.