📋 SCALE FLIGHT EVALUATION

Few sights on an aeromodelling flight strip match the majestic silhouette of a giant scale 122-inch wingspan aircraft lining up on the runway. The Seagull Champion Xtreme Decathlon 122" V2 ARF is an engineering tour-de-force: hand-crafted from selected balsa and aircraft plywood, covered in genuine German Oracover, and engineered specifically for 60cc to 80cc gasoline engines.

1. True Scale Presence & Structural Engineering

With an overall length of 86.6 inches and a wing area exceeding 2,500 square inches, this Decathlon is not merely an RC model—it is a light aircraft in miniature. The two-piece wings connect via a heavy-wall aluminum wing tube and are supported by aerodynamically streamlined functional wing struts.

⚠️
Structural Strut Pre-Flight Inspection: Unlike sport high-wing trainers where struts are cosmetic, the Decathlon 122" wing struts carry positive and negative G-flight loads. Always use high-grade M3 hex bolts with nylon locking nuts to secure strut clevises before flight!

2. Powerplant Matching: The DLE 65cc Advantage

While the airframe accepts 60cc to 80cc powerplants, pairing it with the DLE 65cc Gas Engine creates a sublime power-to-weight balance. At approximately 11.5 kg all-up weight, the DLE 65cc spins a 24x8 propeller with enough thrust to pull the Decathlon through giant vertical loops, knife-edge passes, and inverted low-approach flybys without breaking a sweat.

3. Servo Architecture & Linkage Geometry

Giant control surfaces require immense torque and slop-free linkages:

  • Ailerons: Dual servos per wing half or a single 25 kg-cm high-torque servo per aileron. Utilizing Futaba S.BUS Digital Architecture eliminates thick multi-wire harnesses through the massive wing roots.
  • Elevators: Individual servos for left and right elevator halves mounted directly in the rear fuselage with short, stiff titanium pushrods.
  • Rudder: Heavy-duty vinyl-coated multi-strand stainless steel pull-pull cable linkage crossed inside the fuselage to guarantee dead-accurate center tracking.

4. Flight Characteristics: Handling The Giant

In the air, the Decathlon 122" displays true scale inertia. Roll response is crisp yet authoritative. Inverted flight requires only a breath of down-elevator when the Center of Gravity is correctly calibrated (as described in our CG Balancing & Lateral Trimming Guide).

Landing the Decathlon is pure joy: the high-camber airfoil provides immense low-speed lift. Cut throttle to 15% on final approach, hold a gentle nose-up flare, and let the robust sprung aluminum landing gear grease the mains onto the strip.