Don't know one from the other tbh, just was real big one with two sets of large blades front and back and was peekaboo through the clouds. I saw one last year and it had a large, thick projectile (metal pole or something) as a payload, the tip of whatever it was stuck out Infront and in back of the chopper by a good chunk of feet like nearly half the length of the chopper itself more, was wondering how it landed carrying something like that. lol. One lil bob forward or back would have the payload hit the pavement. Looked real awkward.