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The F41 has the same form-factor as the Estes E12.
What Aerotech single use engine would you say is somewhat compatible to the F41? I use E20's and E30's on a regular basis.
From the NAR website:
As a service to NAR members, the NAR Standards and Testing Committee (S&T) publishes a list of all rocket motors certified for use at NAR launches. As the NAR, the Tripoli Rocketry Association (TRA), and the Canadian Association of Rocketry (CAR) maintain a reciprocal certification policy, motors certified by all organizations are included in this list. Members of all organizations may use motors certified by any organization as long as the motor has been approved for transportation in your country (DOT certification in the USA).