Helldiver 04 Published March 26, 2014 at 4832 × 3753 in Helldiver 04 Museum specialist Will Lee fabricated this rudder rib using plans on file in the National Air and Space Museum’s Archives. (Photo by Dane Penland) Museum specialist Will Lee fabricated this rudder rib using plans on file in the National Air and Space Museum’s Archives. (Photo by Dane Penland)