This catapult throws boom 25's. To work it gently slide VTOL up just under halfway to th first notch. Note do this step gently or it will flip and explode. Next open activation group panel. When ready slide VTOL all the way down and press the desired activation group to launch a bomb. Make sure you release the bomb before the arm gets to 90 degrees up right. Camera selection to follow bombs are provided just make sure you are on the right one. Next the throwing arm should be 180 degrees in the opposite way it started. GENTLY slide VTOL back up to just under halfway to the first notch and repeat firing process until all 7 bombs are launched. it will not work with Boom 50's so don't try it you will blow yourself up. Have Fun!