Event Format: The event is flown in three standard rounds, each with a maximum flight duration of 180 seconds. If needed, the 1st flyoff round is flown with a max of 300 seconds and the 2nd flyoff round is flown with unlimited time. The models do not have to be recovered/returned

Power Class: Competitors fly in the 2.5 N-sec(A) power class, applicable for both Seniors and Juniors.

Scoring: The score is determined by summing up the duration of the three flights during the standard rounds. In case of a tie for medal positions, a flyoff round serves as a tiebreaker.

Model Limit: Participants are allowed to enter a maximum of two models for the three standard rounds. An additional model may be entered for the flyoff round if necessary.

Vehicle Construction: There are many ways to design a S4 rocket including:

• Pop-up elevator

• Pop-down canard

• Slide pod, motor shift

• Swing wing

• Adjustable wing flaps

• Slide wing (partial travel, full travel)

• And many more, check out Chris Flanigan's video on S4 for more information.

Tips for Recovery: Since recovery is very important for multi-round (you have 2 models for 3 flights), add some bright colors or markings to the model.

Chris Flanigan's S4A at vNarcon2022 - https://www.youtube.com/watch?v=fyiufssXafo&t=557s