THE LIFE-BOAT. JOURNAL of the Iro^Al Irationat %Ife=Boat Jnstituticm, (ISSUED QUARTERLY.)
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THE LIFE-BOAT. JOURNAL OF THE IRo^al IRationat %ife=Boat Jnstituticm, (ISSUED QUARTERLY.) VOL. XX.—No. 225.] IST AUGUST, 1907. [PRICE 3d. THE EXPERIMENTAL MOTOR LIFE-BOATS. IN July, 1905, as will be seen by re- taking that confronted the Institution. ference to the LIFE-BOAT JOURNAL for Very great care had to be exercised in November, 1905, page 551, it was de- the installations, and much time occupied cided that three Life-boats should be in putting the boats through exhaustive installed with petrol motors, viz., trials. Walton-on-the-Naze, Norfolk and It was hardly to be expected that Suffolk type, 43 ft. by 12 ft. 6 in. with difficulties or failures would not be ex- a 4-cylinder " Blak'e " of 40 B.H.P., 550 perienced, and anyone thinking that as revolutions, diameter of cylinder 5| in., soon as the machinery was installed and length of stroke 6|- in., and approximate the boats launched the only thing weight 16 c\vt. necessary would be to turn a handle Newhaven self-righting type, 37 ft. and all would go merrily, was doomed by 9 ft. 3 in., with a 4-cylinder Thorny^ to disappointment. There is no good in croft, 24 B.H.P., 1,000 revolutions, 4|- trying to blink the fact, that the first diaineter of cylinder, 5 in. stroke, and experiences in introducing compara- approximate weight 8 cwt.; and the late tively powerful 4-stroke petrol engines Ramsgate Life-boat self-righting type, into the Life-boat service have been 42 ft. by 11 ft., with a 4-cylinder fraught with many difficulties and dis- "Tylor" (originally called "Briton"), appointments. 30 B.H.P., 900 revolutions, diameter of NewJiaven.—Now to trace the career cylinder 5 in., length of stroke 5 in., of the Newhaven Life-boat. The engine approximate weight 8 cwt. for this boat -was ordered of Messrs. At the time when these were ordered Thornycroft on 5th July, 1905. At the the ROYAL NATIONAL LIFE-BOAT INSTITU- same time the structural alterations TION had only one Life-boat fitted with a to prepare the boat for the installation motor, namely, the boat described in the were begun at the Thames Ironworks, Life-boat Journal issued in August, 1904, and it was not until the 9th October, page 247. This boat, stationed at Tyne- 1905, that the engines were sufficiently mouth, has practically always been, under advanced to begin placing them in the the direct supervision of highly skilled boat, which on that day was sent to engineers, and continues to be well re- Messrs. Thornycroft's works at Chis- ported on. As will be remembered, she wick for the purpose of having the is equipped with a 2-cylinder 2-stroke installation carried out there. However, petrol engine of 10 H.P., and as the boat it was not until the 12th January, 1906, herself, compared with those chosen for that the boat was sent back to the the new motors, is of small displacement, Thames Ironworks under her own it consequently was a much bigger under- motor power. Pi\or to this, trouble Vox.. XX.—No. 225.—LIFE-BOAT JOURNAL 244 THE LIFE-BOAT. [IST AUGUST, 1907. had already been experienced with the fill the tank full at stated intervals by carburettor, necessitating a change of means of a vessel which had a capacity pattern. From January to June the of 0 • 8 of a pint when full. This some- time was occupied in making necessary what crude method was the best that alterations to fittings, making the could be adopted with the appliances at motor casing water-tight and renewing hand. Three double runs were made. the propeller shaft, which was found to Consumption Revolu- Mean of petrol in be deeply scored. tion. speed, pints per hour. On the 7th June the boat was taken 1st double run 920 7-231 15-627 down to Long Reach (on the Thames) 2nd „ 760 6-715 22-8 (?) for her speed trials. Shortly after 3rd „ 640 6-001 9-576 leaving Black wall Pier it was found that The amount measured in the second the circulating cold-water service for run was evidently inaccurate, and may the cylinder jackets had become choked ; be discarded, but the results of 1 and 3 to clear the obstruction from the pipes appea'r to be fairly correct. it was necessary to stop the engine, The engines ran satisfactorily at full and the boat was shortly afterwards power and down to 640 revolutions, but taken in tow by one of the other motor below that they would not run properly, Life-boats ; in an hour and a quarter the which was not satisfactory, this speed repairs were completed and the engine being rather too fast to manoeuvre safely again started. Three double runs were with in close quarters or going alongside made over the measured mile, which a vessel. gave a mean speed of 7'238 knots, and On the 26th October the Newhaven afterwards one more double run gave and Walton-on-the-Naze Life-boats left 7 • 46 knots. The water was smooth, the Blackwall for Harwich, where it was run down being made against a strong intended to carry out the sea-trials. It flood and fresh head wind, the reverse was decided to put into Sheerness for conditions being the case in the run iip. the night. On the way down the river On the 13th June the Life-boat was the motor in the Newhaven boat ran put through her self-righting tests, well, the only defect being the excessive which were of the same nature as those heating of the silencer which is placed described in the account of the experi- under the thwart immediately forward mental motor Life-boat in this journal, of the engine casing. This silencer August, 1904, page 249. So far as the got so hot that the matting in which engine was concerned these were quite the life-belts were stowed was- found to satisfactory, the engine stopping when be scorched in places where it came in the boat was hove over to about 60 contact with it. The next day the degrees and being easily started when boats proceeded to Harwich, the New- she regained her upright condition. The haven boat making as much as 8'72 self-righting power of the boat, owing knots over the measured mile under to the new disposition of weights, was sail and motor, and Harwich was not satisfactory, and alterations had to reached without incident. be made to make it so; therefore when On the 30th October the first sea- these were completed she was tried trial took place in a moderate gale, wind again on the llth October and with south, and sea fairly heavy, and against satisfactory results. this wind and sea the first 7 miles was On the 12tli October a progressive accomplished in 1 hour 40 minutes. trial was made to ascertain the con- After this, without any warning, the sumption of petrol. No arrangements machinery stopped dead and the having been fitted for measuring the engineers on board were suffering os amount of petrol used, it was decided to much from sea-sickness that they were IST AUGUST, 1907.] THE LIFE-BOAT. 245 incapacitated from getting at thetrouble. Harwich and her engine taken out. In these circumstances there was nothing The defects being made good, the to be done but to sail back to Harwich. engine was re-installed, but so much The boat was again taken out the next difficulty was experienced that it was day for a four hours' run. The wind not until 24th April that the sea-trials and sea had gone down, and the motor could be resumed. The boat was con- worked well, but consumed far too much sequently taken out on that day and the lubricating oil. A further trial was three following days, the result being made on the following day (1st Novem- only partially successful. The full ber), with satisfactory results. These number of revolutions could not be preliminary trials showed (1) that the obtained. Trouble was again expe- silencer was not satisfactory; (2) that rienced with the reversing gear; the the arrangements for lubricating the silencer got too hot, and a hole was crank-case, gear-box, thrust, and cir- burnt in the deck adjacent to the flange culating pump were in too exposed a through which the exhaust-pipe passes. position^ rendering it impossible to The sea-trials were stopped, and it was replenish the lubricating oil, >fec., in a decided to send the Life-boat to London heavy sea with the boat knocking about for repair and renovation previous to and sea breaking into her; (3) that sending her to her station. A new there were far too many attachments to silencer was fitted of a pattern which the portable hood of the engine casing, had proved very satisfactory in the making it a matter of great difficulty to Walton-on-the-Naze Life-boat, which remove it. has a " Blake " engine. At the time of Further trials were run until the writing, this Life-boat has not yet been 8th of November, when unfortunately despatched to her station, and until she more difficulties began, the sparking and is at her station and away from ex- also the air-supply giving trouble; after traneous control, it is not possible to about four hours' work the sparking give an opinion of any value as to her was put right and the engine was capabilities.