Barnett 1916 V12 'Swallow' Engine
Inspired by the advanced aircraft that was the Lesser European Swallow, Johannes Barnett revisited his old engine - now the staple of the Verusan Sky Crusaders leading aircraft - and set out to utilize his genius once more to improve upon it, so as to upgrade the existing engines in these aircraft without increasing the size, cost or reliability of the engine itself. To achieve this, he set out to raise the engine's RPM and torque by tampering with the camshaft's lobe and lift duration and by raising the compression ratio of the engine, bringing the engine up to between 280 and 300 hp. If necessary, cost can be shifted up slightly, but the engine must remain compatible with all airframes utilizing it and keep it's reliability.
Incandescent Ammunition Revision
Given the enemy's notable use of bright ammunition to guide pilots while firing, the VSC seeks out similar cartridges in two forms - relatively short ranged (350-400 m) 'incendiary' rounds, filled with magnesium and phosphorous, which are set to burn furiously upon being fired and meant to turn the target ablaze, and 'guide' rounds, with a magnesium and aluminium oxide powder at the base, meant to allow the pilot to lead their shot more effectively. Upon completion, these munitions should be used alongside ball rounds in mixed belts, with one guide round every five rounds, and one tracer every two, in the following order.
BALL - BALL - INC - BALL - TRACER - INC - BALL - BALL - INC - TRACER - ...
Lesser European Swallow Maneuverability Improvements
Given the relatively sub-par performance of the Lesser European Swallow in terms of maneuverability, the needless bracing is removed and time is devoted to testing the airframe and tweaking it's control surfaces so as to result in a much more responsive aircraft.