Rensselaer Semi-Weekly Republican, Volume 40, Number 16, Rensselaer, Jasper County, 1 November 1907 — New Type of Motor Boat. [ARTICLE]

New Type of Motor Boat.

In France there has recently beoalaunched a motor boat in which the screw propeller is, placed at the bow instead of at the stern. This is the invention of Audro Gambia, who claims that the boat is non-cnpsizable. The screw is known as a “typhonoid." It consists of a number of blades symmetrically distributed around an axis terminating in a cylindrical tube. Each blkde is composed of two surfaces, one of which is splrai-cylindri-cal, like s loosely rolled sheet of paper, with Its inner edge at the aiuTand ltd' outer portion forming part of the enveloping tnbe. The other surface is smaller, inclined and helicoidal like'the blade of an ord.nary propeller. It extends from the front end of the cylinder to a spiral line some distance behind the front of ths first surface or sheet. the front edges of both blades biting riveted together so as -o form a cutting edge that slopes back from the apex to the circumference. This motor ia expected to develop s speed of sixtv miles so hour with 100 horse-Dower