Saw the beast in person in Kraków. Was inspired enough to dedicate a poem to it:
O the forgotten craft of yore!
To darkest arts I turn once more.
With new and oldest runes combined,
I'll birth the only of its kind:
Four-winged beast from depth of hell
By breath of fire be propel'd!
The cyclops eye, rise in my field!
With venom be your biceps filled!
From skies you'll pour death and gore—
I summon thee, o BELPHEGOR!
...Thus quoth der Polen:
A turbine-engined biplane for crop dusting.