THE LIFE-BOAT. JOURNAL of the National Xife^Boat Jnstitutioru (ISSUED QOABTEBLY.)
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THE LIFE-BOAT. JOURNAL OF THE National Xife^Boat Jnstitutioru (ISSUED QOABTEBLY.) VOL. XXI.—No. 235.] IST FEBRUARY, 1910. [PRICE 3d. ADVANCE IN THE MOTOR LIFE-BOAT. THE last article on the Installation of cylinder 5 in., length of stroke 5 in., the Motor in Life-boats appeared in The approximate weight 8 cwt., fitted with Life-boat Journal, VOL XX., No. 225, a Buffalo clutch, attaining a speed of published in August, 1907, and it will it 6 • 8 knots per hour on a consumption of is thought be of interest to our readers petrol of 18-5 pints; and also the first if we review the progress made since experimental boat, an old self-righter, that date in the adoption of power, which 38 ft. by 8 ft., installed with a 2-cylinder must undoubtedly in the future be an motor of 10 H.P., which was described enormous factor in the facilities for in The Lifeboat Journal in August, saving life at sea. 1904, and which boat is still doing good At thattime(1907)our motor-boat fleet work at Tynemouth. consisted of the following experimental All four of the above boats were boats, installed with petrol motors :— converted, which necessitated consider- Walton-on-the-Naze, Norfolk and able structural alterations to adapt them Suffolk type, 43 ft. by 12 ft. 6 in. with for power, and after exhaustive ex- a 4-cylinder " Blake " of 40 B.H.P., 550 periments had been carried out the revolutions, diameter of cylinder 5J in., Committee of Management, in 1907, length of stroke 6^ in., and approximate considered the time had then come to weight 16 cwt. This boat was fitted go further ahead, and ordered four with a reversing clutch, and attained a more motors for boats specially built to speed of 6 • 6 knots per hour on a con- receive them. sumption of petrol of 20 • 4 pints. This latter was an all-important point, Newhaven self-righting type, 37 ft. inasmuch as adaptation could not pro- by 9 ft. 3 in., with a 4-cylinder Thorny- duce the perfect article, but proved croft, 24 B.H.P., 1,000 revolutions, 4£ invaluable to the Institution in arriving diameter of cylinder, 5 in. stroke, and at the necessary data required in future approximate weight 8 cwt., fitted with a installation, and it must be conceded reversing clutch, and attaining a speed that the results have fully justified the of 7 • 2 knots per hour on a consumption experiment. of petrol of 15-8 pints; and the late An interesting feature in the con- Ramsgate Life-boat self-righting type, struction of the new boats has been the 42 ft. by 11 ft., with a 4-cylinder position selected for the propeller, and "Tylor" (originally called "Briton"), by reference to the sketch plans it will 30 B.H.P., 900 revolutions, diameter of readily be seen the following difficulties VOL. XXI.—No. 235.—LIFE-BOAT JOURNAL. THE LIFE-BOAT. [!ST FEBRUAEY, 1910. are met so far as it is possible to do met with when dealing with a slipway so :— have been overcome; and lastly, and not 1. Racing of the motor in a seaway. the least important, partial immunity 2. Working the boat on a slipway. from the fouling of the propeller arising 3. Partial immunity from fouling by from wreckage alongside a vessel, pier wreckage and other causes. ropes, and the hundred and one matters Dealing with these points in order, liable to cause this and put the motor we must consider that of the danger of out of action, has been provided. racing. A Life-boat, when in the open However, on several occasions on the sea or in breaking water, must necessarily coast the writer has been questioned as be of such a buoyant description that to whether the propeller doing its work her bow and stern are frequently lifted in the tunnel does not mean a certain out of the water, so that to place the percentage of loss of speed, owing to propeller near the sternpost, as is usually its revolving in a smaller body of water done in vessels and boats, would cause than is the case when in the usual so much racing, that no matter how position found in all classes of vessels, well-governed the motor might be there and undeniably this is so to a certain would be undue strains imposed, and extent; but whatever that loss may be, also, a very important matter, the loss the advantages shown in the preceding of power when most urgently required. paragraphs are of such paramount im- It therefore became a necessity to portance that this loss of speed will be select a spot most favourable for this, readily accepted by all Life-boatmen and as will be presently seen to sur- who have already felt the advantages mount other obstacles. The natural of having a motor under their lee. answer to this was to place the propeller Again our readers must bear in as far forward as possible, and the spot mind that the Committee of Manage- selected has been just forward of the ment have in no way departed from after end-box; but it was obvious when their primary decision that the motor we come to the question of working the must be considered solely a means of boat on a slipway, the propeller must be auxiliary propulsion, the same area of not only above the keel, but entirely canvas, and the same facilities for pull- protected from any possibility of damage ing being supplied to all boats, although when both leaving the slipway and in re- as to the latter,, some loss of oar housing her on her return from her work, power must necessarily ensue, owing to which latter has frequently to be done the space required for the motor hatch. under great difficulties, due to windage, In the larger boats this really is- tides and movement in the water. of minor importance, as it cannot be This resolved itself into a tunnel, expected that oar power can be of any which is constructed of mahogany, great value, except for an emergency. and is of a turtle-backed shape, rising The four motors ordered were from the top of the iron keel, com- allocated to the following boats :— mencing from a position" at about one- Sironsay.—A. " Watson " type, 43 ft. third of the length of the boat from by 12 ft. 6 in., a 4-cylinder « Blake " of her sternpost, and extending back in a 40 B.H.P., 600 revolutions, diameter of gradual curve to the sternpost, a hatch cylinder 5 • 3 in., length of stroke 6 • 29 being provided in the deck of the boat in., and approximate weight 15 cwt., to enable ready accessibility to the pro- with a Gaines reversing propeller. peller boss and blades. In this tunnel Stromness.—Self-righting type, 42 ft. then the propeller does its work. The by 11 ft., a 4-cylinder "Tylor" of effect of racing has been very materially 30 B.H.P., 800 revolutions, diameter of reduced ; any possible difficulties to be cylinder 5 in., length of stroke 5^ in., IST FEBRUARY, 1910.] THE LIFE-BOAT. and approximate weight 10 cwt., with a of cylinder 5 in., length of stroke 5J in., Villinger propeller equipment. ajid approximate weight 13 cwt., with Fishguard.—Self-righting type, 40 ft. a Villinger propeller equipment. by 10 ft. 6 in., a 4-cylinder " Tylor " of The first two of these boats were 24 B.H P., 650 revolutions, diameter of completed and despatched to their cylinder 5 in., length of stroke 5j in., northern homes last April. The Stron- and approximate weight 10 cwt., with say boat on her trials attaining a speed a Meissner propeller equipment. of 7 • 2 knots per hour on a consumption A3xi2-6 WATSON TYPE BOKT. INSTALLED WITH 40 B.H.P.MOTOR FlQ.3 FIG. A. FIG.5. FIG. 1.—ELEVATION SHOWING MOTOR, PROPELLER AND TUNNEL. PIG. 2.—PLAN SHOWING MOTOR HATCH, PETROL TANKS ON FORE SIDE, CONTROL WHEEL AND STEERING WHEEL. FIG. 3.—SECTIONS OF APTEB BODY SHOWING TUNNEL. FIG. 4.—SECTIONS OF FORE BODY. FIG. 6.—MIDSHIP SECTION. Thurso.—" Watson " type, 40 ft. by of petrol of 25 pints and the Stromness 11 ft., but this station, foregoing her boat 6'7 knots per hour on 21 pints. claim owing to local difficulties being An account of the passage of these boats foreseen in the future, it was decided to to the Orkneys appeared in our issue of transfer the installation to another boat last August, the crews of both having of the same type and dimensions being been loud in their praises of the benefits built for Broughty Ferry, and the motor derived from the motive power; and selected for her is a 4-cylinder " Tylor " this recalls to the writer a very com- of 40 B.H.P., 600 revolutions, diameter prehensive remark made by a northern B 2 THE LIFE-BOAT. [1ST FEBRUARY, 1910. fisherman when out for exercise in an ments were made for a navigating crew ordinary sailing Life-boat. The topic was to come from Fishguard. She was finally motor power, and the stroke oar, hearing despatched to her station on the 14th the Stronsay boat mentioned, glanced October last, in charge of the Inspector upwards, and, with great admiration, of the Western District, Lieutenant expressed himself as follows : " Ay, mon, E. D. Drury, R.N.R., the voyage proving but yen's a bonny boat"; and there's an extremely valuable experience, much no doubt he hit the truth.