Hey guys, I have a solution for smoke in your 120 size planes. I manufacture a smoke pump that is so small and light it adds minimal wieght to your airframe. The harris brushless programable smoke pump is the lightest competition pump in its class,only 2.2 oz and you do not need an aux battery. It plugs directly into your receiver for power,6 min of smoke on will only draw 25-40Mah from your rx pack. It is compact only 1.5' in diameter and 2.5" long. You can get more info at harrismodelproducts.com rc3dflyr.