I never really switch to 1 engine or the other unless I'm running out of gas, I can't really tell a differance when running just 1 engine or the other when it comes to turning radius, all it does for me, is get me real slow to the point of flat spin... I've found the best way is just to avoid the spin all together which really isn't that hard as long as you manage your speed, attitude, and rudder correctly... Every now and then it still happens, but to me cutting 1 engine or the other really doesn't help IMHO, its just more buttons to mess with, besides, once you get that nose to finally drop in the flat spin, you want as much power as quickly as you can get it because you are now loosing alt quickly, if you have to start your #2 engine then it will take you allot longer to pull out of the stall... Only times I ever use 1 eng is for fuel consumption and if I have damage. Say my left wing is torn in half, I will cut my right engine and just run on my left so I won't have to ride my rudder the whole way back