How big does it have to be before they stop calling it a “model rocket”?
If it wasn’t a replica of the Saturn V I’m sure the BATFE would be knocking on his door....(if they didn’t already)
Good question! Probably a matter of (potential) payload?
That's the largest amount of propellant a single model rocket engine can have in it - by law
Rocket motors at the E level begin to make a transition into a higher powered form of the hobby, with F- and G-engines used by much more experienced rocketeers.
H-engines and above are generally the province of experienced adult hobbyists who fly from fields measured in square miles and launch with clearance from the Federal Aviation Administration.
The 62.5-gram level for a single engine is reached around the mid-G-motor level.
Depending on the manufacturer, motors starting in the medium range around the F-classification and above use an ammonium perchlorate composite propellant.
hobbyists that want to continue to handle and fly rocket motors with propellant amounts greater than 62.5 grams will be able to do so by applying for a permit, undergoing a background check, paying a $25 fee and getting fingerprinted - application forms are available on the Internet.
I guess as long as it isn't as big as the real one, and with a Saturn V you can make a damn big model rocket. I say go for 1/2 scale.