Rules & Standards, 2018 Season

X Class Racing conforms to strict specifications to ensure uniformity, fairness in races, and safety for both pilots and spectators.  For a full list of race rules and safety procedures, please contact us.*


class specifications

  • Frame sizes are limited to 800mm to 1200mm motor-to-motor diagonally at the aircraft's widest point;
  • No fewer than three (3) motors in any configuration is allowed;
  • Liquid fuel of any kind is prohibited.
  • All pilots must have an “arming” position switch or sequence on their radios. The aircraft should not have the ability to power up by any accidental controls from the radio. Aircraft arming may be executed by a specific switch on the radio or by a sequence (e.g., “yaw right”) to actively arm the radio.

  • Pilots must use FPV to pilot aircraft. This can be with goggles or a ground station, LCD-type display.

  • All aircraft must include a “call sign” in their primary video feed either provided by an OSD or by the FPV camera. This call sign must specifically and unambiguously identify the team or pilot from where the video and feed originates

General Race Rules

  • Aircraft must use the video transmitters specified for each event.
  • All aircraft must pass a safety and airworthiness inspection. Once the aircraft has been checked and approved, it must not be modified or changed, or it will need to be re-inspected. Aircraft should be repaired with equivalent parts that were originally used during check-in. The inspector has the final decision on whether an aircraft is accepted and/or requires changes or modifications in order to be approved for racing.
  • All pilots must demonstrate effective “failsafe” procedures defined by the Race Director. In most cases this is a “power down, no pulse” method, where the aircraft will immediately cease flight by stopping all motors and operation if it loses contact with the radio transmitter.
  • All pilots must demonstrate an airworthy aircraft and pass a general mechanics and electronics test.

General Piloting Rules

  • If there is a requirement that all model aviation pilots in a host country have a current license or organizational membership to the local body governing model aeronautics, then all pilots must meet that requirement in order to compete and all pilots must adhere to the rules and regulations of safe airframe operation and flight as defined by that body.

  • All U.S. pilots must have a current AMA membership.

  • All pilots must adhere to any applicable regulations by the relevant local authorities responsible for manned aircraft regulations.

  • Unlawful flight, such as flights near an event at locations where flying is prohibited, will likely result in disqualification from the event.

  • All pilots must attend a general safety briefing and sign the appropriate waivers from the race organizer and venue.

  • Pilots must not power up video transmitters unless they have been instructed to do so, (e.g., they are about to take part in a race). Powering up a video transmitter at all other times may result in disqualification from the event.


Addendum 7/27/18 - All Aircraft USING Crossfire must be set to 100mw, Telemetry off

    Team Requirements

    • Teams must consist of at least one pilot and one visual observer (VO), as well as a team manager who will serve as primary point of contact for the team. 
    • The team manager may also serve as the VO or perform other team roles.

    • The team manager is wholly responsible for conveying communications from the race organizers to other members of his or her team.

    • It is recommended for teams to include additional members such as a mechanic.

    Emergency or Fail-Safe Procedures

    • Should a pilot lose control of their aircraft, the pilot must attempt a safe landing, fly into a prescribed, crash, ‘catch’ zone net, cut throttle in a safe area or execute a fail-safe procedure in a safe area.

    • If a pilot loses video, they must immediately execute a fail-safe procedure and/or attempt to land the aircraft via Line of Sight. All spotters must assist pilot in determining the location of their aircraft.

    • Spotters must maintain visual line of sight of the corresponding pilot’s airframe at all times and must provide verbal directions or situational awareness details to the pilot. If the aircraft breaches the max ceiling height or goes out of bounds, a judge will indicate to the pilot the infraction and the spotter must immediately assist the pilot in maintaining control and safely landing the aircraft.

    Circuit RACE RULES

    • Circuit races are X Class races held at auto-racing venues as part of the night's race program with spectators in the stands, and come with additional rules and requirements.
    • All pilots must be certified by X Class in order to compete in the Circuit races. Please contact us for more info on how to get certified.
    • Because we obtain night-flying waivers for circuit races, all sticks-in-hand pilots participating in circuit races must hold a FAA Part 107 sUAS operator's certification.  A licensed VO cannot serve as a pilots Part 107 proxy. 
    • Pilots must keep their aircraft below the max height ceiling specified for the event, failure to maintain the height limit will result in disqualification and possible decertification by X Class.
    • Aircraft must be brightly lit so as to be highly visible even in low light conditions.
    • Aircraft must feature a canopy or 'body' that is a minimum of 5" wide and 8" long.