Competing in IMAC Freestyle
Throughout the years there has been increased interest in giant-scale airplanes and extreme aerobatic flight. Because I write my columns with scale-aerobatics competitors in mind, I would like to give an overview of the Freestyle category found in International Miniature Aerobatic Club (IMAC) competition.
The best aerobatic pilots—even if they’re not competition pilots—fly with utmost precision and control at all times. Extreme aerobatic pilots combine these elements with demanding moves to create dynamic flights that appeal to both the pilot and spectators.
This column begins with an assessment you can perform on your flying, then gives an overview of the judged elements for an IMAC-choreographed Freestyle routine and a few flight tips to help you at the field.
Performing a Self-Assessment
Familiarity is key when you design your personal Freestyle or flight demonstration. Fly only maneuvers you are comfortable performing, and fly an aircraft you know well—its stall characteristics, how it handles at higher speeds, etc.
- List all maneuvers in which you are proficient.
- Choose only maneuvers you can perform consistently; be realistic.
- If you plan a rolling segment on takeoff, be able to perform it in both directions (takeoff direction can change with wind).
- Practice until control inputs are natural; during a routine you should be thinking about maneuver placement and music cues, not how to execute a specific move.
- If a maneuver is too difficult, remove it from the routine until you can perform it “in your sleep.”
Think about maneuver placement from the judges’ perspective as you refine your list.
The 4-Minute Freestyle Program Defined!
To compete in a Freestyle event at an IMAC competition, you must also compete in one of the five IMAC categories of precision-sequence flying at the same event. Freestyle is a spectator event, but it is scored based on technical merit, artistic impression, and positioning. You have 4 minutes to impress the judges.
Technical Merit
To satisfy technical merit, make complete use of the flight envelope:
- Show high- and slow-speed flight.
- Include high and low G-loaded maneuvers (positive and negative G).
- Demonstrate control in both positive and negative G segments.
- Include high angle-of-attack maneuvers where appropriate—knowing your airplane’s habits is mandatory.
Common issues:
- Don’t perform precision maneuvers on your 3-D rates during Freestyle; it reduces precision. Use lower or medium rates for precision moves (for example, a hesitation roll doesn’t require 45° control-surface deflection and will appear unsafe on high rates).
- Use Aresti figures or simple sketches to plan your routine, ensuring similar cross-box speed flight and a mix of G-loads.
Remember: this is a timed event. Avoid repeating the exact same spectacular move twice; variety is rewarded. Also include a balanced mix of advanced and gyroscopic (torque/rotational) maneuvers to score well across the flight.
Artistic Impression
Artistic impression is about showing dynamic and graceful figures and having a well-choreographed routine—ideally to music. Transitions matter: one maneuver should flow into the next.
Example transition:
- After a low knife-edge pass, apply rudder to keep the airplane parallel to the runway and immediately begin a half rolling loop rather than pausing to correct heading. Small, integrated corrections during the transition make the sequence appear seamless.
Example sequence (shows diversity of speed and axes):
- Airplane flies right to left parallel to the runway, rolls 90° to knife-edge.
- Maintain equal distance before and after the pilot, then push into a 270° knife-edge circle so the airplane comes cross-box toward the pilot.
- Roll 90° to inverted, push to a vertical up-line.
- Reduce power to idle and enter a slow, flat spin.
This scenario transitions from a powerful knife-edge pass to a graceful flat spin, uses X, Y, and Z axes, and combines multiple maneuvers in a short time.
Positioning
Symmetry in the performance zone is essential. Design your Freestyle so left and right sides of the box are used equally; scores will reflect balance and positioning.
Also design routines that are not overly sensitive to wind. For example:
- Place slow segments (torque rolls, spins) so you can perform them into the wind if it’s gusty—spinning into the wind reduces drift.
- If necessary, hover into the wind instead of attempting a torque roll that would drift downwind.
These planning choices separate experienced pilots from the rest.
Closing Thoughts
A great sequence pilot makes an excellent Freestyle pilot. Flying IMAC sequences teaches you to make constant, precise corrections to keep the aircraft exactly where you want it. With practice, those corrections become second nature.
Even if you aren’t a Freestyle competitor, apply these principles to improve your flying. For more information about IMAC competition and rules, visit the official IMAC website listed below, or seek advice from an experienced modeler.
Until next time, fly hard! MA
Sources
- International Miniature Aerobatic Club — www.mini-iac.com
Transcribed from original scans by AI. Minor OCR errors may remain.
