Major Thorpe (writer and artist), Charles Sultan (pencils and inks)
Published in Jumbo Comics #17, Jul 1940 - 9 pagesZX-5 is invited to fly along on a test flight of a new electronic airplane which receives its power from a ground station via air-waves. An explosion forces the plane to crash. ZX-5 is certain there is sabotage involved and looks into it. He finds it was a plot by "Himmled, leader and organizer of the internationally hated Blackguards".
Here are the pages I have of it.