very good idea using a servo for the choke but i already have 8 servos on the plane as it is,ill be running a lithium battery pack with a regulator to drom the voltage down to 6 volts,im also going to run a lithium for the ignition and voltage regulator to drop the voltage to 5 volts,i dont know as of now if i will be able to run a smoke system,i would like to but i would have to come up with some ideas and build the system with a servo tray,the great planes pitts is built very simple and should be easy to build the system,but for now all i want to do is to fly the plane,heres another cool signature i i like

from the movie gingle all the way
"always keep your promisess if you want to keep your friends"