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Due to the lack of information about the physical and mechanical properties of potato in Egypt which are very important to understand the behavior of the product during the post harvesting operations such as harvesting, transporting, sorting, grading, packaging and storage processes and also, it is necessary in processing operations such as cooling, drying and all heat and mass transfer processes  .The main objective of this work to study the physical and mechanical properties of  potato to form an important database for three of the most popular cultivars (Astrix, Diamont and Santana) in Egypt . These properties include: dimensions, mass , volume, , true density, sphericity, geometric diameter, arithmetic diameter, friction angle and rolling angles with different surfaces such as  rubber, galvanized steel sheet, Iron sheet and aluminum in order to determine the best post-harvest options. Mean values of length, width, thickness, mass, volume, true density, sphericity, geometric diameter, and arithmetic diameter were74.99 mm, 47.79 mm, 38.65 mm, 96.35 g, 72525.128 mm3, 1.176 g/cm3, 69 %, 51.74mm and 53.81mm , respectively for potato tubers “variety of  Astrix”. Meanwhile were 64.79 mm, 45.12 mm, 39.81 mm, 78.41 g, 60935.148 mm3, 1.149 g/cm3, 75.35 %, 48.22 mm and 49.91 mm, respectively for potato tubers “variety of  Diamont”. And for variety of Santana were 98.78 mm, 58.19 mm, 44.14 mm, 167.21 g, 132845.954 mm3, 1.193 g/cm3, 64.10 %, 63.31 mm and 67.04 mm, respectively. The maximum friction angle of 28.6, 22.2 and 30.4 degree and rolling angle of 24.8, 20.2 and 27.4 degrees were obtained with rubber surface. While, the minimum friction angle of 16.3, 14.0 and 18.7 degree and rolling angle of 14.0, 13.3 and 15.5  degree were obtained with aluminum surface for Astrix, Diamont and Santana potato varieties, respectively.

DETERMINATION OF SOME PHYSICAL AND MECHANICAL PROPERTIES OF POTATO TUBERS RELATED TO DESIGN OF SORTING, CLEANING AND GRADING MACHINE