15mm Disappearing Gun Platform, 77mm

A disappearing gun platform mounting a 77mm cannon.  The folder contains 5 .stl files, two with the platform retracted, three with the platform extended.  Reconfiguring this item is very easy for me, so if you want the gun in a position that I don't offer, please let me know.

This 77mm anti-aircraft gun is loosely based on historical designs, and may serve your purposes if you need a 3-inch gun on a disappearing platform.  This is one of several different weapons that can be fitted to the disappearing gun platforms on the steampunk armoured airship Zaphnora, as I show in a video where I build the ship.  Battlestations that are ordered to survey the area above the ship for high-altitude aeroplanes generally keep their platforms retracted and their guns elevated, while all others keep the platforms extended, and are able to depress their guns a maximum of 30 degrees to target aeroplanes and light armoured airships that attempt to assail the Zaphnora from below.  As such, the three files with extended platforms have the gun level, depressed 10 degrees, and depressed 30 degrees.  Meanwhile, the retracted platform has the gun either unloaded (no shells in the rack) and level, or fully loaded and elevated 63 degrees.