The following text may have been generated by Optical Character Recognition, with varying degrees of accuracy. Reader beware!

HYDROPLANE MOTOR BOAT. A new hydroplane motor boat has been designed by A. Crocco and O. Ricaldoni, of the Bryata Specialiste, in Rome. The little vessel has been TAe Marine REVIEW suspended with its stem towards the right hand. Fig. 3 shows an end-on view of the vessel"showing the low V- shaped plane, while Fig. 4 shows the arrangement at the stern. Fig. 2 also FIG, 1.--VIEW OF THE 'VESSEL SUSPENDED, WITH ITS STEM TO THE RIGHT. built in the yard of M. Baglietto, at Varazze, on the Gulf of Genoa, and has been run on the lake of Brac- ciano, near Rome. The length of the 'boat is 26 ft. 3 in. and, she is fitted with a Clement-Bayard 80-100-H. P. -motor, having cylinders 180 millimeters by 180 millimeters (7.09 in. by 7.09 in.), and working at a speed of 1,200 R. P. M. It will be. seen from the views we publish that the boat is provided with hydroplanes only at its stem and stern. The planes at the bow are arranged in the manner of a V, while those aft, though similarly disposed, do not join at the inverted apex. These planes,.and the principal members of the frames supporting 39 pellers are of doubled aluminum plat- ing, and weigh each about 12 kilo- grams (26.4 lbs.). Their pitch can be altered while running and they can be reversed. The propellers are mounted on frames of aluminum sheet- ing, which, together with the shafts, gear, transmission and controlling de- vices, etc, weigh 300 kilograms (660 Ibs.). The weight of the motor is also 300 kilograms (660. Ibs.). In- cluding all machinery, fuel, etc., and two men on board, the vessel weighs 1,500 kilograms (3,300 Ibs.). When running the boat rises, so that the hull is clear of the water, and at the speed of 70 kilometers per hour (43.5 miles per hour) which has been obtained by this novel form of vessel, the hull is about 18 in. out of the water. Fig. 5 shows the boat at full speed, supported solely by the V-shaped planes, the hull being clear of the water as described. > FIG, 3.--THE LOW V-SHAPED PLANE AT THE STEM, OF THE VESSEL, FIG, 2;---STERN VIEW OF THE VESSEL. them, are made of steel plating, the remaining parts of the carrier frames being of aluminum. Their arrange- ment is clearly seen in Fig. 1, which gives a broadside view of the boat, shows the arrangement at the stern. Fig. 2 also shows 'the stern of the boat, and this, with the other views, gives a good idea of the arrangement of the aerial propellers. These pro- 18 in. out of the water. We are informed by the inventors of this novel type of boat that on commencing a run, when a speed of about. 10 kilometers (6.2 miles) _ per hour is attained, the bows begin to lift in the water, and the fore fins slowly emerge as the speed increases. At a speed of 25 kilometers (15.5 miles per hour the hull is wholly out of the water, only the flat portion near the stern skimming on the sur- face. At. from 30 to 35 kilometers (18.6 to 21.7 miles). the boat is sup- ported solely by the V-shaped planes; and at the highest speeds yet attained the hull is, as we have already stated, It has been found that waves of a height of 20 centimeters (7.87 in.) -do npt affect the vessel, as at the high speeds the hull stands. quite. clear of the tops of -waves ~of this ~size. Trials of a length of 6 kilometers (3.73 miles) have been run, and sharp turns have