As for anyone ever wanting to start a Pulse Jet in the air I myself would use this set up in the photo.This will fire up a 100% kerosene fueled er90 so its the most powerful Buzz box you could ever want.It could fit in the INFERNO but I dont think I need it really.I dont have much space as it is & I dont want electronic interference drama. This small coil is off a V8 car & is good for 50.000V & over 3 amps.They are prone to failing if you use copper leads on them & if the spark has no where to go.The electronic circuit you have to make your self but I have the planes if you can build this type of thing OK .Dont cost much to build & run car coils at 283HZ per sec.This makes the Spark Plug I use glow red in the center guarantying the er90 fire up instantly.I use old car can coils (with no ballast resistor)in buzz boxes now as they never fail.Most use Ford T coils for starting Dyna jets.