The Take Away on Rollover Drag Factors

September 13, 2011 by · Leave a Comment
Filed under: Crash Reconstruction 

Dolly rollover tests suggest that the appropriate drag factor range for use in rollover reconstruction, excluding special circumstance, is 0.38 to 0.50.  The finding is from the calculated results of 81 dolly rollover crash tests statistically trimmed to exclude the upper and lower 15 percent.

Reevaluation of roll phase analysis of rollover tests on an actual highway found lowered average roll phase drag factors.  The average roll phase drag factor as published in the papers was 0.53 g (min = 0.39, max = 0.74) and the average reevaluated drag factor was 0.45 g (min = 0.36, max = 0.52).  Natural rollover tests suggest the appropriate drag factor range, excluding special circumstances, is 0.39 to 0.50.  The finding is from the calculated results of 21 naturally occurring rollover crash tests statistically trimmed to exclude the upper and lower 15 percent.