Manuscripts/Mixed Material Bulletins, from July 13, 1908 to September 28, 1908
5 Experiments with Edbert Aug. 8, 1908 .
Exp. 1 Testing the pull. Mr. Baldwin went on board the Edbert and started the engine while Mr. Bedwin held the boat from the wharf. Only three cylinders working well, pull 60 lbs. After some fussing over the engine and blowing out of carbuatters all four cylinders started off well. The pull of the Edbert went up at first to 90 lbs. and then settled down to a steady 85 lbs. This was considered fairly satisfactory. Exp. 2 Another experiment gave 480 rotations of the propeller in ½ minute with a pull of 70 lbs., but Mr. Baldwin thinks that the speed-indicator reading was unreliable.
Exp. 3 Edbert then taken out into harbor to test effect of hydroplanes. Under action of aerial propeller the stern rose and the head was depressed, so that Baldwin fearing another upset like the first, shut off the power. There can be no question that the boat was lifted by the action of its hydroplanes.
Exp. 4 The angle of the bow hydroplane was then increased to 11°19‘, the other two hydroplanes remaining at angle 5°43‘. Result was very promising. Boat undoubtedly rose when propelled and more on even keel. Rain stopped further experiments.
Experiments with Edbert Aug. 10, 1908.
The wind was too strong in the harbor to do much with the Edbert. About 5 o'clock it had moderated somewhat and we tried her with an additional hydroplane under the bows, making four hydroplanes in all. (Towed by the Gauldrie).
At speed of about 4 miles an hour she succeeded to lift about 2 inches at the bow and about 4 inches at the stern. The speed however was not satisfactory.