# Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance), Division 6.4.2: Wind tunnel measurement


The vehicle shall be in the condition described in paragraph 6.3. of this Sub-Annex.
The vehicle shall be placed parallel to the longitudinal centre line of the tunnel with a maximum tolerance of ± 10 mm.
The vehicle shall be placed with a yaw angle of 0° within a tolerance of ± 0,1°.
Aerodynamic drag shall be measured for at least for 60 seconds and at a minimum frequency of 5 Hz. Alternatively, the drag may be measured at a minimum frequency of 1 Hz and with at least 300 subsequent samples. The result shall be the arithmetic average of the drag.
In the case that the vehicle has movable aerodynamic body parts, paragraph 4.2.1.5. of this Sub-Annex shall apply. Where movable parts are velocity-dependent, every applicable position shall be measured in the wind tunnel and evidence shall be provided to the approval authority indicating the relationship between reference speed, movable part position, and the corresponding (CD × Af).

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/4/division/division/6./division/6.4./division/6.4.2. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-6./division-6.4./division-6.4.2.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.