![]() ![]() ![]() Prepare tractors and trailers for testing as follows: To determine C d A values for a trailer, perform coastdown testing with a tractor-trailer combination using a standard tractor. (b) To determine C d A values for a tractor, perform coastdown testing with a tractor-trailer combination using the manufacturer's tractor and a standard trailer. (a) The terms and variables identified in this section have the meaning given in SAE J1263 and SAE J2263 unless specified otherwise. 310 apply instead of the provisions of this section for Phase 1 tractors. Several of these exceptions are from SAE J1263 (incorporated by reference in § 1037.810). Follow the provisions of Sections 1 through 9 of SAE J2263 (incorporated by reference in § 1037.810), with the clarifications and exceptions described in this section. These procedures are considered the reference method for tractors, but an alternate method for trailers. The coastdown procedures in this section describe how to calculate drag area, C d A, for Phase 2 tractors, trailers, and vocational vehicles, subject to the provisions of §§ 1037.525 through 1037.527. ![]() § 1037.528 Coastdown procedures for calculating drag area (CdA). ![]()
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