2.5. SPECIAL RULES FOR SPEED RECORDS IN A STRAIGHT LINE
2.5.1. Base:
For model aircraft of the Free Flight sub-classes, the record is measured over a base of 50 m for model
aircraft with elastic type motors and of 100 m for model aircraft with piston type motors.
The course must be flown in both directions within 30 minutes.
For radio controlled model aircraft the base must be 200 m, and it must be traversed in both directions
without any intermediate landing.
The altitude of the model aircraft must remain below 35 m and above 5 m during the 100 m entry and 200
m course. These altitudes are measured from the point where the pilot is standing.
The dossier of the record must include a certified measurement of the course and a statement of the
methods used to determine altitude and speed.
For radio control speed record attempts the model aircraft must be fitted with a throttle or any other
device to stop the motor by radio control.
2.5.2. Timing:
The timing of speed records must be effected by timing instruments approved by the National Airsports
Control.
The time is taken as the model aircraft enters and leaves the base.
Timekeeping must be effected by two timekeepers equipped with electronic stopwatches recording to at
least 1/100 of a second. The difference between the times registered by the two time-keepers must not
exceed 0.05 second. Automatic timing devices are allowed provided the system is properly documented
in the dossier and approved by the NAC of the claimant.
For speeds above 300 km/h manual activation of timing devices is not permitted. Only automatic means
of timing which eliminate the human error factor are permitted and must be certified accurate within 1/100
of a second.
The mean of the two speeds of the two runs over the timing base gives the record speed.
2.6. SPECIAL RULES FOR SPEED RECORDS IN A CLOSED CIRCUIT
2.6.1. Base:
The course consists of a square, defined by four prominently coloured pylons set 200 m apart on a 900
angle to each other, situated on flat land, or land with a maximum fall not to exceed 1 metre in 200 m
within 1 km of the course. Each pylon shall be consecutively numbered one through four. Using a line
between Pylon One and Pylon Two as a base line, set Pylon Five (or a wire sighting device) midway
between them (i.e. 100 m from each pole). At an angle of 90 degrees to the Base Line set Pylon Six 20 m
distant from the Base Line. Place a 10 mm wide reflective (contrasting) strip of tape between Pylon Five
and Six as the Start/Finish line.
Note: It is essential for accurate speed measurement that all pylons be absolutely vertical in order to
prevent course length differences with altitude.
R/C gliders must be free of the launching cable (specified in 2.2.5.) prior to crossing the Start/Finish line.
Models which land prior to completion of all four legs of the course, or intrude into the forbidden airspace
(except after timing is completed) are disqualified and the flight void. There is no altitude restriction or
prohibition against circling in thermals outside the course.
2.6.2. Timing:
The timing of speed records must be effected by timing instruments approved by the National Airsports
Control.
Timing begins when the model aircraft crosses the Start/Finish line and ends when the model aircraft
completes the course and again crosses the Start/Finish line still airborne within 30 minutes from launch.
Timekeeping must be effected by two timekeepers equipped with timepieces timing to at least 1/100 of a
second. The difference between the times registered by the two timekeepers must not exceed 1/50 of a
second.
Four judges will be situated immediately under each pylon and will raise a red flag when the model
aircraft infringes the space bounded by the poles.
The pilot, his helper, timekeepers and the timing equipment must be located and remain during the record
attempts inside the course at Pylon Five. Each pylon judge, also inside the course, will signal with a light
when the nose of the model aircraft has passed the sighting device.
Each pilot may have one (1) helper who may launch or release the model aircraft for take-off and keep
the pilot informed of the position of his model aircraft during the record attempt.
Quelle: Sporting Code Sc4, Volume ABR, Seite 58f.
Aber es gibt inzwischen dank der Computertechnik ganz erfolgversprechende und sogar einigermaßen bezahlbare Lösungsansätze, wie man sowas auf die geforderte 1/100 Sekunde genau messen kann. 
...... naja - ist Modellflug wie F3D und wie F5D ...... oder nicht ?????????? Weiss nicht - Modellflieger dieser recht neuen Sparte als Verrückte zu bezeichnen .......... 
Hallo Hartmut!