I guess I am just a bit touchy about some things -
I get the strong impression that some feel any airfoil not developed thru wind tunnel and computer work ups -are just not worth much.
I don't have any full scale experience in designing airfoils - none zip zero nada.
That said -I really don't see much correlation with the foils we need .
I have plodded thru a motley collection of textbooks tho -and must admit -they are 50 years old for the most part.
Some times I tempted to say " if my airfoil is only good enough - let's see one which performs better"- but that serves no one any good.
As a background --I have designed a lot of pneumatic circuits- some patented innovations -not just improvements on patents - so I do understand a wee bit about how air operates .
best yet the designs were and still are used- intact since 1970 -
So when I say SWAG- I mean a guess based on a lot of thought - but -it is still just a guess.
I will keep on guessing .
The Lockheed engineer story has many parallels -I am sure -
We had a engineer , who was asked to design a table for the tooling shop -for a two ton press.
He had one made which would support two tons ---