ボール式進水装置に就いて

概要

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Under the present condition in which we are suffering from shortage of good qualified tallow, this system can be used for launching of large-type ships, without any tallow, by rolling steel balls between the rails of standing ways and sliding ways. It is far superior to the "Truck System" because of bigger allowable load and less friction, and is more advantageous than the "Roller System" due to the fact that balls can roll smoothly around any axis. 1) Diameter of ball is (90 m/m±0.5 m/m) and material is of high chrome steel. Each ball has 17 tons of allowable load and they are not effected by temperature like tallow. 2) Friction of this equipment may be expressed approximately by the following equation : F=μW F : Friction W : Launching weight μ : 0.01 in which μ shows ratio between friction and launching weight which is considered to be almost fixed. 3) This equipment can be used permanently and will cut down launching expenses considerably. Furthermore, it may be favorable for "Slip way" owing to merit of small friction.
社団法人日本船舶海洋工学会の論文