<p>The paper presents the results of investigating hydraulic losses and convective heat transfer of single drop-shaped tubes in air flow around them on both the side of the small diameter and the side of the large diameter in the range of Reynolds numbers 1.5·10⁴–7·10⁴. A similarity equation Nu = f(Re) is suggested, allowing an estimate of a total heat transfer of drop-shaped tubes with an error of ±2.5%, and similarity equations Eu = f(Re) are proposed, making it possible to assess the hydraulic losses in flow around them on the side of the large diameter (with an error of ±(2–20)% and the small diameter (with an error of ±2%), respectively. It is shown that the use of drop-shaped tubes as elements of heat exchange devices is promising. The obtained results can serve as the basis for further investigations of hydraulic losses and heat transfer of drop-shaped tubes.</p>