well, I guess technically its the output shaft housing?
Being American, "drive" shaft might be accurate.
In England, a "drive shaft" is a drive axle.
As opposed to a Prop (Propellor Shaft)
So maybe its Prop Shaft housing.
...
okay, I just looked it up.
lol
Quote: "The reduction gear is contained within the large casing behind the propellor.
Magnetos are mounted on the top of this casing [I missed those] , one on either side of the propellor governor."
So, its not even the output shaft that connects to the propellor!