Wow, lots of gloom and doom predictions for a dinky little .10 size engine. Sure, every engine is dangerous, but this is only 2xs the size of the little .049 cox engines we played with when we were 8 years old. We didn't have "experts" around, we just read the directions on the box and went for it. Put it on the boat, start it, keep your fingers out of the way, point the boat away from you, let it go and have a blast. If it works it works, if not it won't be the end of the world.