The Estes F15-4 engine delivers high-thrust power and long burn times, making it a reliable choice for mid-power rockets. With a 4-second delay, it’s optimized for heavier, single-stage rockets needing a smooth boost-to-deploy transition.

Built for performance, the F15-4’s extended 3.45-second thrust duration provides impressive altitude gains, while the 29 mm casing ensures compatibility with a wide range of larger rockets. It’s an ideal choice for modelers ready to step up from D and E engines.

Includes:

2 × F15-4 Engines

2 × Starters

4 × Starter Plugs

ATTENTION: These engines cannot be sent to post office boxes. Please be sure to provide a PHYSICAL ADDRESS when purchasing E and F sized engines.

E and F sized engines cannot be shipped to Alaska, Hawaii, Puerto Rico or Guam.