This Austrian company makes a small engine for supermodels and/or ULM. It has 12 cylinders in V it is an exercise in micromechanics, with gearbox and mechanical supercharging.

“Pace 263”

-The powers that it delivers depending on the rotation regime are:

-34 HP at 3,500 rpm
-48 HP at 5,000 rpm
-68 HP at 9,000 rpm

-They are very suitable for fighter planes of the Second World War type that are reduced in size.

From Appendix 11: According to their website, now (nov, 2020) there are two 263 model versions:

The 263S that is turbocharged and the 263NA that is naturally aspirated.