The aircraft I may be using for the dogfight RP, with Andifferous' approval. :D

It features 3 rotating double-barrelled machine gun turrets, plus portholes for armed passengers. It has a counter-rotating system of two props that spin in opposite direction, to prevent the aircraft from being spun by the force of one prop. It also has a harpoon-style grappling hook. I guess it can be used for puncturing airships, or for towing purposes. It also has two conventional aero-engines to assist forward flight. These can be turned off when landing or taking off vertically.