[j-c-c]

Originally Posted by freebeard

https://www.researchgate.net/publica..._on_Tip_Vortex

Poruous airplane wings have been studied since the 1930s, their biggest hurdle was clogging up with ice in cold weather.

Without reviewing the link, that is referring to primarily lift enhancement under varying conditions, rather than outright drag reduction as the main focus on this thread, meaning its not really applicable to the original goal here? Be kind, I did open the link.