The Critical Engine | Pilot Tutorial 

There are counter rotating props, however from what I understand it increases maintenance costs substantially due to engine side specific parts.

Rather than having two critical engines, aircraft with this design are said to have no critical engine, as failure of either would create the same yawing moment.

In a perfect world all multis should be counter rotating, but that also increases costs as now both engines are different. As someone who trained and got their multi in a conventional twin (spin same way) it’s really not that bad and with decent training easy to deal with. I don’t think multi rides should ever be done in counter rotating props as a critical engine failure is something everyone should learn to deal with

they have those as well but there more expensive

sr 7 There's no critical engine on the turbofan or turbojet, only twin propeller driven aircraft has the term 'Critical engine'.

@@zheqiu4429 only "conventional rotating" twin propeller aircraft has to figure out wich one is the "critical engine", and all the twin propeller aircraft you can find these days are all counter rotating. I think they just bring this critical thing out for teaching purpose...