Every year or so I meet up with an old grad school friend and his boys in Death Valley for Thanksgiving. We've been flying single engine low power rockets and it's time to take it up a level. I was inspired by ToneDeafJunior's build of the SpaceX Falcon Heavy: https://www.rocketryforum.com/threads/falcon-heavy-spacex-boyce-aerospace-build.149263/ But I want to try to build it as a cluster so all three engines work. This is my first time trying that so here I am in the beginners forum with my noob questions. And maybe this will help others who want to try this build. So for starters I need a plan check: Falcon 9: https://shop.spacex.com/products/f9-flying-model-rocket-kit The SpaceX Falcon Heavy Upgrade Kit from Boyce Aerospace Hobbies: https://boyceaerospacehobbies.com/p...heavy-upgrade-kit?_pos=1&_sid=a2da1f624&_ss=r 18" BT-60 tubes (4) https://www.apogeerockets.com/Build...er_Tubes/41mm_x_18_Body_Tube_Estes_BT-60_Size Engine parts for 4 engines 3.75 inch E Motor Mount Tube for 24MM 10 Pack Motor Block/Thrust Ring BT50 Package Of 10 UMRS 24mm to BT60 Engine Mount (2) Large E Type Motor Hook 24mm (2) http://www.unclemikesrocketshack.com/Motor_Mounts_Accs/Single_MM.html Estes EST1693 E12-6 Standard E Engines (24) Strap-on Booster Replacement Hooks (8) : https://www.apogeerockets.com/Build...ster-Hooks/Strap-on-Booster-Replacement-Hooks [edit: Thanks kuririn, I realize now this is the wrong part and there are lots of problems with this option in general. I may opt to not have booster separate if I cannot find a workable alternative] 18 inch printed nylon parachutes (4) https://www.apogeerockets.com/index.php?main_page=shopping_cart&product_id=2353 Estes Pro Series II Launch Controller https://www.apogeerockets.com/Launch-Accessories/Launch-Controllers/Pro-Series-II-Launch-Controller [Edit: Thanks boatgeek, I'll look for an alternative] So my question at this point is what did I forget? Oh yeah, would it be possible to actually fire the second stage? The second stage is above the parachute for the 1st stage. That would be beyond cool.