Maximum ram pressure p_ram in dependence of the eccentricity e and the semimajor axis a. For comparison, the tensile strengths of a loose (Skorov & Blum 2012) and a compacted dust sample (Steinpilz et al. 2019)are shown as well as the tensile strength of the Allende meteorite (Flynn et al. 2018). The planetesimal is destroyedby the gas drag, if the ram pressure exceeds the tensile strength of the planetesimal material (below the corresponding curve).