SOUND LEVEL RECORDING PROCEDURE
TESTING SETUP DIAGRAM-CLICK HERE PRINTABLE
TESTING
SETUP INSTRUCTIONS-CLICK HERE PRINTABLE
RECORDING SOUND LEVELS TO BE
ACCOMPLISHED ACCORDING TO COMPETITION REGULATIONS 94‑95 EDITION PAGE 64
PARAGRAPH 4.2 NOISE LIMIT AND PAGE 156 SOUND ADDENDUM.
MAXIMUM NOISE LEVEL SET AT 96 DECIBELS (CONTEST LEVEL)
STANDARD
PROCEDURES:
1.
MODEL
TO BE PLACED ON THE GROUND.
2.
ALL
MEASUREMENTS TO BE TAKEN WITH THE MOTOR RUNNING AT FULL POWER.
3.
THE
PERSON RESTRAINING THE MODEL SHOULD DO SO BY HOLDING THE MODEL BY THE REAR OF
THE AIRCRAFT.
4.
READINGS
SHOULD NOT BE TAKEN WHEN OTHER LOUD SOUNDS ARE PRESENT INCLUDES THE RUNNING UP
OF OTHER AIRCRAFT).
5.
THE
PERSON WITH THE TRANSMITTER SHOULD BE WELL AWAY FROM THE AIRCRAFT.
6.
PERSONS
NOT INVOLVED WITH THE LEVEL READINGS SHOULD BE WELL AWAY FROM THE AIRCRAFT, UNDER
TEST.
7.
SET
THE METER ON A TRIPOD 12" ABOVE THE GROUND.
8.
ALL
READINGS ARE TO BE TAKEN DOWNWIND OF THE MODEL.
9.
METER
SHOULD BE SET ON THE RIGHT HAND SIDE, NINE FEET FROM THE CENTERLINE OF THE MODEL
AT A 70° ANGLE WITH A SLIGHT UPWARD ANGLE.
10.
SET
THE METER TO THE ‘A’ POSITION, CHECK BOTH FAST AND SLOW RESPONSES.
11.
A WIND SCREEN SHOULD BE USED
ON THE METER TO CUT DOWN ON WIND PRESSURE.