Canada's Fourth Agricultural-Motor Trials.
Page 3
Page 4
If you've noticed an error in this article please click here to report it so we can fix it.
11th to 23rd July, 1910, at Winnipeg.
Rules and Conditions.
The following rules and conditions will be strictly adhered to 1. The entries shall be classified as follows by the judges : (a) internal-combustion engines 20 b.h.p. and under; (b) internal-combustion engines 21 to 30 b.h.p.; (c) internalcombustion engines over 30 b.h.p.; and (d) steam engines. Prizes shall consist of : first prize, gold medal; second prize, silver medal; third prize, bronze medal. [Presumably, in each class.—En.]
2. All entries must be made on or before June 1st, 1910. Entries must be made on the official form, with all the data filled in accurately, and must be accompanied by entry fee of $5.00 for each entry.
3. Any firm or individual may enter more than one motor.
4. The fuel used during any test shall be that supplied by the Exhibition Association, and will be supplied to contestants at the following rates:— Gasoline, 20 cents per gallon of 277 cubic inches. Coal oil. 18 cents per gallon of 277 cubic inches. Soft coal, $8.50 per ton of 2,000 lb. Wood, $4.50 per cord. 5, Each competitor must have sufficient staff for the care of and running of his motor.
6. All motors entered for competition must be on the grounds not later than July 11th, 1910. 7. Each motor will be allotted an official number, which shall be displayed during the competition. 8. Each motor shall be allotted a certain space on the grounds, where the motor shall he exhibited at all times except when being tested. Only those meters taking part in the tests will be allowed on this space. 9. The tests will comprise brake-test, plotighing-test, and such other tests as the judges deem essential. 10. The ploughs, belts, chains, water-tanks and such other things, as may be required during the test, must lie supplied by the contestants. 11. The judges may test the engines in any order that may seem to them desirable. The contestants will be given one hour's notice when to be ready for test. 12. Each contestant must supply a recording dynamometer and sufficient charts for two hours reading for all the tests of his engine.
The Brake Test.
The brake test shall consist of an economy test, extending over a period of two hours, and the maximum horsepower teat for a period of thirty minutes or longer, at the discretion of the judges.
The brake apparatus used last year consisted of two iron pulleys mounted on and keyed to a four-inch shaft. This shaft was carried by two large bearings, on a strong wooden frame. The pulley marked A is 40 in. in diameter by 16-in, face, and on this pulley the belts from the engine are run. The other pulley (B) is 50-in, diameter by 18-in, face, flanged both on the inside and outside of the rim with flanges projecting two inches. Around this pulley is wrapped four falls of rope, arranged with pulleys to equalize the strain on all the rope. The oak block to which the ropes are fastened at the top is carried by a hook-bolt (G) to a dynamometer which is supported from the framework. The lower block has a long bolt, on which a number of 25. lb. nesting weights are hung. These weights are on a scale, and, when the ropes are slack, the full amount of the weights and bolt are on this scale. The pulleys revolve in the direction of the arrow, so that all the friction has a tendency to make the weights rest entirely on the scale. Now, if the hook-bolt were tightened up sufficiently, it would take up all the slack and have a tendency to lift the weights elf the scale. For example, suppose an engine runs the brake pulley at 240 r.p./n., and the ropes pull down on the upper dynamometer 1,300 lb., and on the scale at the start there were seven 25 lb. weights and 5 lb. of bolts, nuts, mashers. etc., making 180 lb. in all, and, when running as above. there are only MO lb. shown on the scale: that means that the slack side of the ropes are tight enough to lift 80 lb. off the scale, or that, of the 1,300 lb. shown. 1,220 lb. are due to friction and 80 lb are due to the weights. This 1,220 lb. pull due to friction multiplied by the velocity at which the ropes would travel—if it were a belt on pulley B—would give the amount of work done, and, if that were divided by 33,000, would give tile. h.p. For example, the pulley is 50 in. in diameter and the rape, say, 11 in. in diameter : then, the centre of the rope is 51+ in., and at. 240 r.p.m. the h.p. would equal Is 7 33.000 119 h.p. it can readily be seen that, by tightening up on screw G, any desired amount of tension can be obtained on the ropes, and thus the friction between the pulley and the rope increased. The pulley is kept cool by a coustant stream of water. running into the inside of the rim, and at the same time an equal amount being drawn o. The speed usually employed to run a separator would run the brake at about 240 r.p.m.; at this speed, it has been found to take about 2 h.p. to run the brake. This 2 h.p. is added to the h.p, developed by the engine.
Competitors will he allowed 15 minutes, after they have lined up to the brake, to " try out " their engine. and to state the amount of load they wish to carry. Last year, some of the engines had to withdraw from the brake test. and the manufacturer should be careful to have everything in good shape for a hard run. After the cumpetitor has stated the load he wishes to carry, the operators will keep the brake as near that load as possible for two hours, and no change will be made. Careful measurements of the fuel and water used will be taken, and the condition of the engine noted; also, the mean effective pressure developed in the cylinder will be taken into account. After the two hours' run, the test will be made of the maximum h.p. the engine will develop for 30 minutes. careful measurements again being taken of all the fuel and water.
Hauling Tests.
Hauling tests shall consist of hauling the load around the tract for a period of two hours ; the load shall be rnaele up to suit the capacity of the engine. A number of loaded wagons will be provided, so that a load of any size may he obtained, the larger engines hauling the dead engine and one, two or more wagons as desired. Between the engine and the load there shall be placed a traction dynamometet, which shall accurately record the draw-bar pull for the period of two hours. The course consists of part sod, part gravel and part block pave, ment ; ettreful measurements of all fuel and water supplied will be taken, and of all stops, etc., that may occur. A trial round will be allowed, so that the competitor may be able to select a suitable load. Note will be taken of the ton-miles hauled per unit of fuel and water used, the proportion of draw-bar .h.p. to the b.h.p., and such other data as the judges deem essential.
Ploughing Test.
The ploughing test shall extend over a period of three hours, or longer, if deemed necessary by the judges. The contestants may use any make of plough they wish, the depth of ploughing to be as directed by the judges. A recording dynamometer. which will accurately record the pull for at least a period of two hours, will be placed between the engine and the plough. Careful measurements will be taken of the fuel and water used, the aeresploughed, the draw-bar pell, the fuel per acre, the distance travelled without replenishing, and such other data as the judges deem essential.
Design and Construction.
'Under this head will be considered the perfection of the working parts from mud and dust ; dust-proof hearings, accessibility of all parts, such as valves, igniters, hearings, fuel and water tanks, facilities for washing out the boiler, cleaning grates and tubes; easy manipulation, such as starting and stopping, reversing and the genera/ handling of the engine; the clearance of working parts from the ground; the proportion of the various working parts of the machine and the materials of construction; the workmanship and method of lubrication.
General.
It is to be expressly understood and agreed by the manufacturer, that the engines entered in the competition are of the same material and construction as those he is selling in the open market. Only such pressures and speeds will he allowed, during the tests, as are used under ordinary working conditions. The judges may limit the speed or pressure of any engine, wh.ert they deem it necessary to a fair test. Contestants must submit their dynamometer, steam gauges, etc., to such tests as the judges deem necessary to assure them of their accuracy. The following are points upon which the awards will be made, but they may be changed at discretion of judges :—Brake test, 150; hauling test, 100; ploughing tests, 200; and design and construction, 50—total, 500.
Prof. A. R. Greig, A. W. Bem„ Manager.
Prof, L. J. Smith. Winnipeg, Man.
Engineers in charge.