Umuman olganda, alyuminiy qotishma baliq ovlash qayig'ining korpusini Tezlik {{0}} Uzunlik nisbatiga ko'ra uchta asosiy turga bo'lish mumkin. Bu boshqa o'lchamsiz raqam. Alyuminiy qotishma baliq ovlash kemasining tezligini tugunlarda ifodalang va bu raqamni olish uchun uni suv chizig'i uzunligining kvadrat ildiziga bo'ling. Misol uchun, suv liniyasi uzunligi 25-fut bo'lgan motorli qayiqning maksimal tezligi 12 tugun va tezlikning-uzunlik nisbati 2,4 ga teng. Yana bir misol, suzib yurish tezligi 28 tugun va suv chizig‘ining uzunligi 1,{9}} fut bo‘lgan okean layneri. Tezlik{11}}to-uzunlik nisbati 0,885.
Okeanga{0}}oʻtayotgan oddiy laynerlarga oʻxshab, baliqchi qayigʻining oʻzgaruvchan korpusi yuqori tezlikda harakatlanayotganda koʻtarma hosil qilmaydi. Haqiqiy siljish korpusining maksimal tezligi-uzunlikka- nisbati 1,34 ni tashkil qiladi. Bu tezlikda, quvvat kuchaygan bo'lsa-da, qayiqning dumidagi qoralama faqat chuqurlashishi mumkin, ammo qayiqning tezligini oshirib bo'lmaydi. Eshkakli qayiqlar, kanoelar, tortuvchi qayiqlar va standart yelkanli ekskursiya qayiqlarining barchasi odatdagi drenaj korpuslariga ega.
For example, the waterline of a sailing boat is 25 feet, and its speed is 6.7 knots, or about 71/. mile per hour, with a speed-length ratio of 1.34 times the square root of 25. This is the "hull speed (Hull s knock pee called d)" if flying increases the sails and power, it will only cause the boat and its equipment to overwork.
The other type is the semi-displacement hull, which often has a round Russian part and a fairly wide tail plate to obtain the lift generated by the water flow below the hull. It has a higher speed than the drainage type, and the speed-length ratio can be up to 2.5. For example, shrimp boats in Maine, some brisk sailing boats, yachts and various old excursion boats. This type is also called semi-planing hull.