I have not played with model rockets in many years (around 16 years), and these have been sitting since I played with them last.. I found them back in my parents basement, so decided to let one go! This flight was with a B4-2 engine, as it was all I had in the pile of old stuff that fit in it. The Viking rocket is amazing with 48 possible fin configurations. When flown on standard engines, the Viking is able to reach amazing launch heights over 1600 feet. Build the Viking in a day and fly to the moon tomorrow. Skill Level 1 Length: 12.1 in. (30.7cm) Diameter: 0.74 in. (19mm) Estimated Weight: 0.6 oz. (17g) Card Stock Fins, Self-stick Decals, Streamer Recovery Recommended Engines: 1/2A6-2, A8-3 (First Flight), A8-5, B4-4, B6-4, B6-6, C6-5, C6-7