Some older (circa 2009) concept sketches for "Inner Space".
I won't disclose too much about the world in which the graphic novel is taking place, but suffice to say there are two empires (and a few smaller nations) locked in a technological arm's race, cold war style.
The technological level is somewhat equivalent to our world's during the 1920s, and most machines are twists on old favourites (entirely justified in-universe, but I'm not going to talk about that yet).
A composite drawing (in real life two different pages from my sketchbook) detailing the two main fighter aircraft types in use in the "Inner Space" world.
Because rubber is unheard of in this universe, the best method of launching and retrieving aircraft is by hooking the trapeze on the top wing to crane like structures on the ground, which provide safe deceleration. Manoeuvring the planes around the airfield is done either via special trolleys or by overhead rails in hangars and on ships.
On our world, These kind of operations were successfully tested with the so-called "parasite fighters" of the flying aircraft carriers "USS Macon" and "USS Akron" as well as the post-war jet powered "Goblin" designed to protect the XB 36 "Peacemaker" strategic bomber.
Mixed traditional media, including markers and ink.