Lol i had a small model that was called the Blue (something, i think maybe moon?). It only got a few hundred feet in the air. I have a large model now that uses the big engines that you have to be 18 years old to get and are behind the counter, but i never flew it. Its sitting out in my garage ready to go. My engines are sitting in my room (maybe i should get them out of the house lol) on my shelf. Its supposed to go up about a 1000ft IIRC.
When i lost my little on, i had the bright idea one day to may a cardboard rocket from scratch. I used a foot long paper towel tube. I rapped the small engine in foil to insulate it from the cardboard, i taped on some paper plate cutout fins and launched it. It worked fine for about 50ft then it started to tumble and flew into the ground and burned lol... it didn't even have a parachute.
As a kid, one of my modeling dreams was to rig up a Space shuttle rocket set. I would build the SRB's to be real rockets and have a foam main tank and then i would have an RC model Shuttle. After the vertical launch, i would then separate the Shuttle and fly it off as an RC. It was going to have 3 ducted fans in it for its engines. That would have been cool and is still a small dream i have, but i probably never will do it.