Thread highjack alert.
Dan Gurney used some boundary layer tech/principles in one of his Eagle Indy car designs, until that avenue was written out of the rules.
You mean designer Len Terry, don't you? (Formerly of Lotus, IIRC.) Didn't Terry also use the rad outlets to manipulate the BL flow?
AIUI, the delta gets the benefit by effectively going to an extremely long chord, so flow doesn't separate.
If the links are right, it wouldn't matter if Germany did get laminar flow, because the wing as built would never sustain it, because fit & finish were so poor...
A thought: couldn't the Me-109 &/or P-51 have turned the rad horizontal & fed it with a flush BL scoop? Would turning the outlet ducting sacrifice thrust from the hot air?
Another: if reducing drag is the goal, what about reducing tip vortices? I understand the modern winglets make a big difference; was there a way to do that in the '40s? Tip fences? Do winglets, or fences, actually eliminate the vortices, or just move them around? Is there an actual way to eliminate vortices? (I've read a paper suggesting there is, but I really didn't understand it....

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