Some typos happen unconsciously, but honestly...

It was a stupid design, about as much over-engineered as the 5 cm leGrW 36 (platoon mortar). German engineers of the 30's were totally in love with spin stabilisation and neglected fin stabilisation (see also Rz 65, Nebelwerfer 41).

This, by the way, enabled the 8th air force to use its quite poor heavy bomber designs (which were mere target practice for fin-stabilised low-tech R4/M rockets!) in the first place.