They've also added in a strengthening rib that extends rearwards

3 Wide Arm Mounts C and D (#91882 and #91883) on T6

0mm Driver

New-style U solder tabs for easy soldering and wiring

Estes Rockets - E16-4 29mm Model Rocket Engines (2pk) dealslist They've also added in aThe E16 4 Engines (29 mm) by Estes Rockets deliver powerful and reliable performance for mid to high powered model rockets. Ideal for single stage flights or upper stages of multi stage designs, these engines provide an impressive total impulse of 33. 68 N sec and a 4 second delay for optimal parachute deployment. Whether you're launching larger rockets or experimenting with advanced models, the E16 4 is the perfect choice for rocketeers seeking