Σύγκριση μεθόδων

	Θεωρία Γραμμής Άνωσης Προπέλας	Μέθοδος Holtrop-Mennen
Πεδίο	Αεροδιαστημική	Αεροδιαστημική
Οικογένεια	Process / pipeline	Process / pipeline
Έτος προέλευσης	1929	1982
Δημιουργός	Sydney Goldstein	Jelte Holtrop, Gert Mennen
Τύπος	Design theory	Prediction method
Θεμελιώδης πηγή	Goldstein, S. (1929). On the vortex theory of screw propellers. Proceedings of the Royal Society of London. Series A, 123(792), 440–465.	Holtrop, J., & Mennen, G. G. J. (1984). An approximate power prediction method for fast monohull ships. International Shipbuilding Progress, 29(335), 166–170.
Εναλλακτικές ονομασίες	lifting line theory, propeller design method, Goldstein method	Holtrop method, Mennen method, ship resistance prediction
Συναφείς	3	3
Σύνοψη	Propeller lifting line theory is a mathematical framework for analyzing and designing ship propellers by modeling each blade as a lifting line with circulation distribution. Developed by Sydney Goldstein in 1929 and refined by Kerwin and others, the method accounts for blade loading, wake effects, and propeller interactions. Lifting line theory provides efficient predictions of propeller thrust, torque, and efficiency and remains standard in preliminary propeller design and optimization.	The Holtrop-Mennen Method is an empirical regression-based technique for predicting total ship resistance from geometric parameters and operating conditions. Developed by Jelte Holtrop and Gert Mennen in 1982, the method decomposes total resistance into friction, pressure, wave-making, and form drag components, each estimated from ship dimensions, hull shape, and speed. Widely adopted in maritime engineering, the Holtrop-Mennen method remains the industry standard for preliminary ship design and propulsion power estimation.