What is the distance around a launcher for a rocket using a 3-motor cluster of J motors that must be cleared of easy to burn material, assuming the motors aren't 'sparky'?

What is the distance around a launcher for a rocket using a 3-motor cluster of J motors that must be cleared of easy to burn material, assuming the motors aren't 'sparky'?

• A. 10 feet
• B. 30 feet
• C. 50 feet
• D. 75 feet

Answer: (D)

Safety around a launch pad is defined by a clearance radius large enough to keep people and property out of harm when firing high‑power hardware. A three‑motor J‑class cluster produces a substantial plume, heat, and potential debris. Even if the motors aren’t sparky, the hot exhaust and any burning fragments can travel a considerable distance and ignite surrounding easy‑to‑burn material. Clearing that area around the pad reduces this risk, but with this level of power the safe buffer must be large enough to cover worst‑case debris paths and heat exposure. For this configuration, the recommended safety radius is 75 feet, providing a generous buffer for plume spread and debris trajectories. Smaller distances like 10, 30, or 50 feet don’t offer enough protection for a three‑motor J cluster.

Safety around a launch pad is defined by a clearance radius large enough to keep people and property out of harm when firing high‑power hardware. A three‑motor J‑class cluster produces a substantial plume, heat, and potential debris. Even if the motors aren’t sparky, the hot exhaust and any burning fragments can travel a considerable distance and ignite surrounding easy‑to‑burn material. Clearing that area around the pad reduces this risk, but with this level of power the safe buffer must be large enough to cover worst‑case debris paths and heat exposure. For this configuration, the recommended safety radius is 75 feet, providing a generous buffer for plume spread and debris trajectories. Smaller distances like 10, 30, or 50 feet don’t offer enough protection for a three‑motor J cluster.