Rules & Standards, 2019 Season

X Class Racing conforms to strict specifications to ensure uniformity, fairness in races, and safety for both pilots and spectators.  For more info on our race rules and safety guidelines, please contact us.


class specifications

  • Frame sizes are limited to 800mm to 1200mm motor-to-motor diagonally at the aircraft's widest point.

  • Minimum of 3 motors - No Maximum Motor Limit. Any motor configuration is allowed.

  • No Maximum for Prop Size.

  • No Maximum Battery Cell Size.

  • Liquid fuel of any kind is prohibited.

  • All pilots must have an “arming” position switch or sequence on their radios.

  • Pilots must use FPV to pilot aircraft. This can be with goggles or a ground station 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 .

  • All Aircraft using CrossFire or FrSky R9 must be set to 100mw and Telemetry Off.

General Race Rules

  • All aircraft must pass a safety and airworthiness inspection. If aircrafts need repairing they will need to be inspected again after the repair. 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 aircraft must have a “failsafe”, which will be checked in the safety inspection. It must be “power down, no pulse”, where the aircraft will immediately cease flight by stopping all motors and operation if it loses radio transmitter signal.

  • Events may opt to specify the use of a specific selection of Video Transmitters (Vtx’s)

  • If the aircraft breaches the max ceiling height or goes out of bounds, a judge will indicate to the pilot the infraction.

Canopy & LED Requirements

●     (Effective 3/1/2019) All aircraft should feature a canopy and LEDs that meet the below requirements. Pilots with compliant aircraft will receive a full five 'show up' season points for a race, three for canopy compliance and two for LED compliance. Pilots without compliant canopies or LEDs will not receive the respective 'show up' points. Final judgment on compliance at a race will be at the discretion of the race director. Pilots at Open races with aircraft that are not compliant with the canopy and/or LEDs requirements will still be allowed to compete and will still be eligible for the normal two to eight season points issued for finishing place. Pilots at Circuit races with aircraft that are not compliant with the canopy and/or LEDs requirements will at the discretion of the race director either not be allowed to compete, or will be allowed to compete but similarly will not receive some or all of the five possible 'show up' season points, and in that case will still be eligible for season points issued for finishing place.

Canopy Requirements:

○      Must be one visibly contiguous piece.

○      Must be able to fully obscure a 2" by 2" index card when viewed from the front or back.

○      Must be able to fully obscure a 2" tall by 4" long index card when viewed from either side.

○      Cut out sections on sides must be small enough to be fully obscured by a 1" by 1" index card.

○      Cards must be held vertically for measurement, at a 90 degree angle from the horizontal plane of the aircraft.

○      Must be fixed to the frame or arms in such a way that it will not come off the frame in flight.

○      Should have at least one surface suitable for displaying a sponsor logo.

○      (Please note that these requirements are meant as an absolute minimum, and we expect most canopies to be larger based on the size of the frames and batteries. We also intend to continue to work towards larger canopies in the future, but we wanted to enact the rule for this year in a way that is minimally difficult to comply with and maximally inclusive.)

Please see the following illustrations:

Illustration #1 Illustration#2

LED Requirements:

○      For daylight races, aircraft must feature LEDs that are clearly visible from behind and below, with a total of at least sixteen individual LEDs. For races that may include civil twilight, night or are indoors, aircraft must feature LEDs that are clearly visible from all directions - in front, behind, to the sides, above and below.

Season points system

○ All registered X Class races, including Open Races and Circuit Races held by the X Class organization or any chapters, are eligible for Season Points.

○ The sum of points earned at a maximum of five (5) of a pilot’s best points races for the season will count as their overall Season Points Total.

○ The top sixteen (16) overall Season Points Total holders at the end of the last officially scheduled race before the X Class World Championship will be eligible to compete in the X Class Season Championship.*

○ Pilots at all Season Points–eligible races will receive up to five (5) points per event for registering and bringing a qualifying aircraft to the event that meets the canopy and LED requirements, assuming they meet all other qualifications to race. Three (3) points will be awarded for canopy compliance and two (2) points will be awarded for LED compliance.** These points will be received even if the pilot fails to race.

○ At races with five (5) or more competing X Class pilots, pilots who compete in the Mains will receive the following points distribution in addition to their base of up to five (5) points: 1st = 8 points, 2nd = 7 points, 3rd = 6 points, 4th = 5 points, 5th =5 points, 6th = 4 points, 7th =4 points, 8th=3 points, 9th=3 points, 10th+=2 points.

○ At races with fewer than five (5) competing X Class pilots, pilots who compete in the Mains will receive the following points distribution in addition to their base of up to five (5) points: 1st = 7 points, 2nd = 6 points, 3rd = 5 points, 4th=4 points.

(* The number of pilots eligible for the championship may be increased if demand is higher than expected.)

(** Canopy/LED rules take effect 3/1/2019. For races before that date, the full 5 ‘show up’ points will be awarded to all pilots who register and bring an aircraft that qualifies for all non-canopy/LED requirements.)

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 at events, such as flights near locations where flying is prohibited or at a prohibited time, will result in a disqualification from the event.

  • All pilots must attend a general safety briefing, allow a safety and airworthiness inspection on their aircraft 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 will result in disqualification from the event.

    Team Requirements

  • X Class is intended to be a team racing format. Currently one pilot is allowed to compete but teams are highly recommended.

  • Teams should consist of at least two people; one pilot, one visual observer (VO / Spotter) and a team manager who will serve as primary point of contact for the team.

  • The team manager may also serve as the VO or a Team Pilot.

  • 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 / pit help.

Emergency or Fail-Safe Procedures

  • Should a pilot lose control of their aircraft or lose video, the pilot & VO must attempt a safe landing, fly into a prescribed crash zone, cut throttle, have the VO take control LOS, or execute a fail-safe procedure in a safe area.

  • Each spotter must assist their 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.


  • Circuit races are X Class races held at auto-racing venues as part of the race day program, or at other large spectator-facing venues such as during active sporting events. There will be public in the stands and motorsports or other activities occurring. These races come with additional rules and requirements.

  • For Circuit races in the US, 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 pilot’s Part 107 proxy.

  • All pilots must be certified by X Class in order to compete in Circuit races. Please contact us for more info on how to get certified.

  • 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 de-certification by X Class.