d) No reflight is allowed other than if fouled by another model during steering.
e) The decision to steer is the responsibility of the competitor and must be done by him. A physically handicapped competitor
must arrange for a substitute with the contest officials. In the case of poor sight, a medical doctor's affidavit certifying that the
competitor's vision is inadequate can be submitted under the following conditions:
i) The better eye’s vision is no less than 6/12 (metres). or
ii) The results of a binocular vision test show that the competitor’s binocular vision is either medium or non-existent.
Submission of this affidavit to the contest organiser or event director will permit the competitor to appoint a substitute steerer.
f) It is the timekeeper's responsibility to observe the use of the steering equipment, and to warn the competitor if he is likely
to endanger other models. If other models are fouled by the steerer, the fouled competitor has the choice of a reflight, which,
if taken, is his score for that round. He must exercise his choice to the timekeepers no later than two minutes after termination
of his flight. If he chooses to restart, he must do so before his next official flight.
3.4.8. Classification
The total of two best flights of each competitor shall be taken for final classification. In the case of a tie the third best flight
decides and so on in the case of a further tie.
3.4.9. Timing of Flights
The flights must be timed by two timekeepers with electronic stopwatches with digital readout recording at
least 1/100 of a second.
From Section 4b. para B.13., only B.13.1., B.13.2., and B.13.6. apply to class F1D.
The timing of each flight shall commence when the model is released. Timing will terminate
when:
a) the model touches the floor of the building.
b) jettisoning occurs.
c) the model comes into contact with any part of the building or its contents other than the floor and translational
movement ceases.
Note: In this case, the timekeepers shall continue to time for ten seconds after translational movement has ceased.
Should the model remain in contact with the building or its contents after 10 seconds, timing will cease and the 10 seconds
will be subtracted from the flight time. Should the model release itself from contact with the building in less than 10 seconds,
timing will continue normally.
3.4.10. Number of Helpers
The competitor is entitled to have one helper.
3.4.11. Launching
a) Launching is by hand, the competitor standing on the ground.
b) Winding of rubber motors must be done by the competitor himself.
3.4.12. Ceiling Height Categories
The following ceiling height categories are recognised for contests and records:
I. - less than 8 metres.
II. - between 8 and 15 metres.
III. - between 15 and 30 metres.
IV. - higher than 30 metres.
The height of the ceiling is defined as the vertical distance from the floor to the highest point at which a circle of 15 metres
diameter can be inscribed, below the primary structure of the building.