Somehow I ended up with a pack of these, and I was wondering what rocket they would be most suited for. For sure they won't work in my Big Daddy or Executioner. I'm guessing they might work in a CherokeeD. The CherokeeD IIRC is BT55 diameter. Are there any BT60 diameter kits intended for D engines that might fly with a D12-7 (or maybe a D12-5)? Would a D12-7 put a CherokeeD out of sight?