A decimeter (dm) is one tenth of a meter... 26 square dm is 0.26 square meter... or 403,008 square inches... does that sound more appealing...?
Good stuff Steuermann! What did you do to the car engine for it to be "highly modified"?
I liked the subtitle of the vid: Männer und Motoren... Men and engines, lol, that just about sums it up.
I myself tend to be very intrigued by pieces of machinery that create a lot of noise, smoke, flames, heat and wind (not necessarily all together and in that order).
Tried my turbine engine for the first time yesterday: talk about an ear to ear grin...!