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Aviation History
1918
1918 - 0689.PDF
JUNE 20, 1918. The water pump spindle is provided with a spring-loadedface-washer of steel in place of a gland, and the spindle is lubricated by hand, as in the- 260 h.p. engines, by a. largescrew-down grease lubricator accessibly arranged on the pilot's seat. Details of this water pump are clearly shownin the sketch, Fig. g. The Air Pump. This is of a new design, and is now driven off the front end ofthe camshaft, as in the 260 h.p. engines. The piston and barrel of the air pump are made of cast iron, and the pistonis operated by a small connection rod of bronze and a double webbed crank, as shown in the sectional sketch, Fig. 10.The air pump crankshaft is provided with four serrations which fit into the corresponding splines cut on the insideof the hollow camshaft. The bore of the pump is 40 mm., and the stroke is 40 mm. Air inlet ports are drilled in the lower portion of the pumpbarrel and are uncovered by the piston at the bottom of its stroke, and the delivery check valve is situated in the headof the pump barrel. A regulating valve is provided directly above the check-valve, the released air escaping through thecentre of the hollow adjusting screw, and also through six small holes drilled radially in the screwed cap which formsthe seating of the regulating valve. A self-contained oil trap is provided by the gun-metaljacket which surrounds the barrel of the "air pump. This is fitted with a drain cock, as shown in the sketch. The airpump piston and crankshaft are lubricated by the excess oil in the camshaft casing. The main oil lead from the oil pump to the hollow camshaftis taken through a passage drilled in the crank-chamber of the air pump, the oil entering the camshaft through four5 mm. holes drilled radially in the hollow air pump crankshaft, which register with a groove cut in the inside of its bearing. Engine Data. mm-. Number and arrangement of cylinders ;v Bore StrokeStroke/bore ratio Area of one piston.Total piston area of engine Stroke volume of one cylinderTotal stroke volume of engine Volume of clearance space ..Compression ratio. Total volume/clearance volume.Normal b.h.p. and speed Piston speedBrake mean pressure Cu. ins. of stroke volume per b.h.p. Sq. in. of piston area per b.h.p.B.h.p. per cu. ft. of stroke volume.B.h.p. per sq. f t. of piston area Six, vertical, separate. 140 mm. =5.51 ins. 160 mm. =6.30 ins. 1 • 142 :i. 23-84 sq. ins. =153.9 sq. c. 143.04 sq. ins. =924 sq. c. 150.28 cu. ins. =2,463 c.c. 901.68 cu. ins. =14,778 c.c. 41 • 3 cu. ins. =676.64 c.c. 4.64: 1. 174 b.h.p. at 1,400 r.p.m. 1,470 ft. per min. 109.1 lbs. sq. in. 5.18 cu. ins. 0.823 s<i- in- 334-°- I75-O- Direction of rotation of crank and propeller.Lubrication system Oil consumption per hour ..Oil consumption ptr b.h.p. hour. Oil pressure Volume of oil carried in base-chamber. Number and type of car-burettor. Diameter of chokesBore of main jets. Bore of pilot jets Fuel consumption per hour Fuel consumption per b.h.p.hr. Inside diameter of inductionpipes Number and type of magnetosFiring sequence of engine .. Ignition timing (fully ad-vanced). Speed of magnetos. Inlet valve opensInlet valve closes Diameter of inlet valve (small-est diam.) - d. Lift of inlet valve = h. Area of inlet valve opening(w.d.h.) Mean gas velocity through inlet valve Clearance of inlet tappet Exhaust valve opens Exhaust valve closes Diameter of exhaust valve (smallest diam. ) =rf.Lift of exhaust valve =A. Area of exhaust valve opening Clearance of exhaust tappetDiameter of inlet and exhaust ports Diameter of water pump inletDiameter of water pump out- letRatio of water pump speed to crankshaft speed.Delivery of water pump normal speed Inlet water temperature Outlet water temperature . Water jacket capacity of one cylinder. Anti-clockwise facing pro-peller. Forced, multiple plungerpump. 7-3 pints =8.21 lbs. 0642 pint =0.047 Ib- 20 lbs. sq. in. 17 pints. One dual Mercedes, twin-jet. O-945 in. =24 mm. 0.058 in. =1.472 mm, 0.022 in. =0.559 mm. 9+-8s pints -=85.32 lbs.0 • 545 Pint =0.491 lb. 2.126 ins. =54 mm. Two, Bosch, Z.L.6.1. 5. 3. 6, 2, 4. 300 early. 1 • 5 engine speed.Top dead csntre. 400 late. .2.677 ir>s. =68 mm. O>453 »n. =11.5 mm. 3-8r sq. ins. =24.58 sq. c. 153-4 ft. per sec. 0.017 in. =0.432 mm. 400 early. io° late. 2.677 in =68 nim. °-453 in- =11.5 mm.3-8i sq. ins. =24.58 sq. c. 0.014 in. =0-355 mm. 2.165 ins. =55 mm. 1.692 ins. =43 mm. 1-575 ins. =40 mm. at 41.4 gals, per min, .. 640 Cent. 740 Cent. 1,280 c.c. Side view of G. 97. 687
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