F3A RC Plane: What Pattern Aerobatics Planes Are and How the Class Works
An F3A plane is a precision aerobatics (“pattern”) model built for the FAI F3A competition class. Pilots fly set schedules of manoeuvres inside an imaginary box in front of judges, who score precision, symmetry and smoothness. The rules limit wingspan and length to 2 m each and the weight to about 5 kg, and set noise limits, so most current F3A planes are electric, often with contra-rotating propellers, and built from lightweight composites. Entry-level pattern planes let club pilots try the style without a competition budget.
By Kyle HilsonUpdated: October 20263 min read
Key class rules
| Rule | Typical limit |
|---|---|
| Wingspan | Max 2 m |
| Length | Max 2 m |
| Weight | Max about 5 kg (see current FAI code for what’s included) |
| Noise | Limited; measured at contests |
| Power | Electric dominates; glow allowed within limits |
Summary only; national associations publish the current FAI Sporting Code and their own lower classes.
What makes a pattern plane different
An F3A plane has a long, slim fuselage, a mid-wing with symmetrical airfoil, and large but precise control surfaces. It’s designed to track straight, fly at constant speed up and down lines, and roll axially without wandering. Contra-rotating props cancel torque and prop wash effects, which helps it fly identically up and down. Composite construction keeps weight under the limit while making the airframe very stiff. That’s very different from 3D planes, which hover and tumble at low speed; compare how to fly 3D.
Schedules and judging
Competitors fly published sequences: loops, rolls, stall turns, snap rolls, spins and combinations, centred in front of the judges. Each manoeuvre is graded on geometry, size, positioning and smoothness. Schedules change every few years, and there are lower classes with simpler sequences for novices and intermediate pilots.
How to start
- Be confident with a low-wing sport plane: rolls, loops, inverted flight, crosswind landings.
- Join a club with pattern pilots or a national pattern association.
- Start in a novice or sportsman class with a simple schedule.
- Use an entry pattern plane or a used F3A plane rather than a new top model.
- Practise on a simulator: the schedule, centring and box awareness.
- Ask an experienced pilot to call manoeuvres and give feedback.
Equipment
- Airframe: composite F3A model or an ARF pattern plane for starters.
- Power: a large outrunner or contra-rotating drive on high-voltage packs (often 10S or more on full-size F3A).
- Servos: precise, digital, with no slop; aileron and elevator precision matters.
- Radio: computer radio with flight modes, expo and mixes to correct coupling.
- Set-up tools: incidence meter, throw meter, balancing stand.
Buying
New competition F3A planes are expensive and built in small numbers. Many pilots buy used planes from competitors who upgrade every few seasons; they’re often well maintained and set up. See F3A pattern planes for sale.
Trimming
Pattern flying depends on trim. Pilots adjust CG, thrust lines, wing incidence and aileron differential through a series of test manoeuvres until the plane tracks straight in every attitude. Mixes in the radio correct small couplings (for example, rudder-to-aileron for knife-edge). Good trim is worth more than a better airframe.
Checklist for a first pattern plane
- Large enough to see clearly (1.6–2 m class).
- Smooth, consistent power system.
- Digital servos with no play.
- A radio with flight modes and mixes.
- A club or mentor for set-up help.
FAQ
What does F3A mean?
It’s the FAI class code for radio-controlled precision aerobatic aircraft.
Are F3A planes electric?
Most are now, often with contra-rotating props.
What is the size limit?
2 m span and 2 m length.
F3A vs 3D?
F3A is precise geometry at speed; 3D is low-speed hovering and tumbling.
More on this topic: the complete RC Airplanes guide covers the basics behind this article.
About 20 years in RC. Mostly boats in the NAVIGA Mini Eco Expert class, with many self-made parts; also a King Motor Baja 5B, a home-built electric plane, home-built nitro planes he has flown, and an RC helicopter. More about SwellRC
