Piaggio Stella P.IX is a nine-cylinder radial engine from the 1930s. Apart from several prototypes and obscure aircraft, there were three notable applications: IMAM Ro.37, Savoia-Marchetti S.81, and its civilian version, Savoia-Marchetti S.73.
This model is a byproduct of my Piaggio P.XI and Gnome-Rhone 14K projects. I had no scale plans and only used photos of the IMAM Ro.37 wreck from the Vigna di Valle museum as a source. Make your own opinion about the accuracy.
The default scale is 1/72.
The author hasn't provided the model origin yet.