Maximum flight velocity of blood drops in analysing blood traces

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Presentation transcript:

Maximum flight velocity of blood drops in analysing blood traces Beat P. Kneubuehl Forensic Science International Volume 219, Issue 1, Pages 205-207 (June 2012) DOI: 10.1016/j.forsciint.2012.01.005 Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

Fig. 1 Typical blood stain pattern with several stains, whose impact direction passes far away from the estimated centre of origin (also case example 1). Forensic Science International 2012 219, 205-207DOI: (10.1016/j.forsciint.2012.01.005) Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

Fig. 2 Air drag coefficient at low velocities (see [3]). Adapted from L. Prantl, Ergebnisse der aerodynamischen Versuchsanstalt zu Göttingen, Oldenbourg/Munich/Berlin, 1923, p. 29 R. Forensic Science International 2012 219, 205-207DOI: (10.1016/j.forsciint.2012.01.005) Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

Fig. 3 Ballistic reconstructions of the blood drop trajectories in the same case as Fig. 1. The centres and the belonging trajectories are drawn in different colours. Forensic Science International 2012 219, 205-207DOI: (10.1016/j.forsciint.2012.01.005) Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions

Fig. 4 Case 2: The yellow lines mark the impact directions of blood drops at the distant wall. Four blue and one green lines are the reconstructed trajectories which led to the right centre of origin (in the same colour). The other coloured lines are trajectories which did not need ballistics calculations. Forensic Science International 2012 219, 205-207DOI: (10.1016/j.forsciint.2012.01.005) Copyright © 2012 Elsevier Ireland Ltd Terms and Conditions