Reviews

• Scratch Ring Thing By Hans "Chris" Michielssen (May 2, 2009)

  Brief: This model was designed and flown for the 2009 EMRR Challenge. I rarely build or fly two-stage rockets. My best success with staging incorporated the old Centuri Pass-Port design. The holes in the coupler gave the booster engine that extra split second to ignite the upper stage. I didn't want to go with a standard two-stage design, fins above fins. I decided on a ring ...

Rocksim Design Files

• Ring Thing