Just saw this;
I note the ongoing discussion about patents. This article says that KTH invented them in 2008.
What propulsion are they using? Appears to be a very ducted prop which would be inefficient?
Just saw this;
I note the ongoing discussion about patents. This article says that KTH invented them in 2008.
What propulsion are they using? Appears to be a very ducted prop which would be inefficient?