Steam-powered parasite fighter

This is a small fighter aircraft powered by the steam stored in a pressure tank behind the pilot cabin. Steam is discharged through a turbine geared to the ducted pusher propeller. After that, steam is expelled through a nozzle, leaving a trail. Wings can be folded by pivoting.
Flying time is about five minutes at full throttle. The fighter is released by the steam-powered mothership at a flying cruising height of 9.000 m. The fighter can be recovered to replenish steam and ammunition spent.
This is part of a steam air wars hardware designed for a story.