Are you serious?!!!!
A 1940 is gonna make the poor .5 go WHAKO. Definately no the right motor.
A 1930 is already an over kill. A Kontronik Twist-47 or 55 with 3s will make you VERY happy.
To tell you the truth, I have a bad feeling that the .5 will not last for long with the 1930/5, not on 4s.