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Aviation History
1918
1918 - 0129.PDF
JANUARY 31, 1918. Impact Test on Crankshaft—p 2fi ft lb 10 ft. lbs. 3 ft. lbs. 3 ft. lbs. on ^oss *n direction on place as indicated in,attached sketch. B. M. DEPARTMENT, R.A.F.July 16th, 1917. • $:• ENGINE DATA. Number and arrangement of cylinders Bore Stroke Stroke/Bore ratio Normal b.h.p. Normal speed Piston speed Area of one piston Total piston area of engine Swept volume of one cylinder.. Total swept volume of engine.. Volume of clearance space Compression ratio, total vol./ clearance vol. Air standard efficiency Brake mean pressure Mechanical efficiency (calcu- lated) Indicated mean pressure (cal- culated) Fuel consumption (lb. per b.h.p. hour) Brake thermal efficiency (18,500 B.T.U.'slb.) Indicated thermal efficiency .. Relative efficiency 6 (vertical, separate) 6.30 in. 7.09 in. 1.125—1 252 1,400 r.p.m. 1,655 ft. min. (27.6 ft. sec' 31." 17 sq. in. 187.02 sq. in. 221 cub. in. 1,326 cub. in. 56.10 cub. in. 4.94—1 47.30 per cent. 107.50 lbs. 87 .90 per cent. 122 .35 lbs. sq. ia. 0.541 lbs. 25 .46 per cent. 28.96 „ 61.20 FRICTION LOSSES (CALCULATED). (In terms of lbs. per sq. in. of piston area.) Bearings, valve gear and auxiliaries .. .. .. 2.50 lbs. per sq. im. Fluid pumping losses .. ..4.50 Piston friction .. .. .. 7.85 ,, ,, Total losses Brake mean pressure ..Mechanical efficiency, 107 122.35 GAS VELOCITIES Gas Choke tubeVertical induction pipe.. Induction manifold Inlet port Inlet valveExhaust valve Exhaust port .. 14-85 ,. .. 107.50 „ 50/ ; 87.90 per cent. , VALVE AREAS, &C. Velocity. 302 .0 ft. per sec. 70.2 125.6 ,, 115.6 ,, .. 158.0 ,,.. 158.0 .. 115.6 Cross Sectton Area. Choke tube Vertical induction pipe..Induction manifold Inlet port (total) Inlet valve (total) (dh.) Exhaust valve (total) (dh.) Exhaust port (total) .. See drawing of carburettor (total, 2,850 sq. in.) 12.18 sq. in. 6.86 „ 7-44 .. •• 5-45 .. •• 5-38 „ 7-44 .. Diameter. Choke tube .. .. .. See drawing of carburettor Vertical induction pipe.. .. 3 .937 in. Induction manifold .. .. 2.953 .. Inlet port (each) .. .. 2.175 .. ' Exhaust port (each) .. .. 2.175 ,, - L Industrial Reconstruction. THE Lord Mayor will preside at the inaugural meeting of the Industrial Reconstruction Council which is to be held on Friday, February 15th, at 3 p.m., at the Guildhall, London. Dr. Addison (Minister of Reconstruction), Mr. G. H. Roberts (Minister of Labour), Lord Burnham, Mr. J. H. Whitley, and other speakers representative of all industrial interests, will Inlet valve (two per cylinder)— Outside diameter of valve Lift of valve Width of seating Diameter of stem, in guide Diameter of stem, below guide Radius under valve head Length of valve guide Length of spring, valve closed Ratio—Length of spring lift of valve Exhaust valve (two per cylinder)- Outside diameter of valve Lift of valve Width of seating Diameter of stem, in guide Diameter of stem, below guide Radius under valve head Length of valve guide Length of spring, valve closed . Ratio—Length of spring lift of valve 2.362 in 0.398 0.0787 O.433 O-433 0.394 3.818 2.362 5-95 —1 2.362 in O-3950.0787 O-433O.433 O.3943.818 2.362 5-99 —1 INERTIA STRESSES, LOADING ON CRANK-PIN BEARING, &C. Weight of piston, complete with rings, gudgeon pin, &c. .. .. .. 10.725 lbs. Weight per sq. in. piston area .. .. o. 344 lb. Weight of connecting rod, complete with bearings .. .. .. .. 7.00 lbs. Total reciprocating weight per cylinder 13 .225 lbs. Weight per sq. in. piston area .. o .424 lb. Length of connecting rod between centres 12 .835 in. Ratio, connecting rod/crank-throw (l./r.) 3.62 — 1 Inertia pressure, lbs. per sq. in. piston area— Top centre Bottom centre Mean Weight of rotating mass of connecting rod Total centrifugal pressure Centrifugal pressure, lbs. sq. in. piston area Total loading due to inertia and centri- fugal pressures Mean average fluid pressure, including compression and pumping strokes Mean average loading on connecting rod bearing, total from all sources in terms of lbs. per sq. in. on piston area (-| inertia) Diameter of crank-pin Rubbing velocity Projected area of big-end bearing Ratio, piston area/projected area big-end bearing Mean average pressure on big-end bear- ing Loading on connecting rod big-end bolts— Maximum load due to inertia at 1,400 106.70 lbs. sq. in. 60.50 ,, 83.60 ,, „ . 4.50 lbs. 887 ,, 28.45 lbs- scl- in- 112.05 .. 44.00 „ 128,120 ,, ,, 2.520 ins. 15.40 ft. per sec. 8.80 sq. in. 3-545 — 1 454.00 lbs. sq. in. r.p.m.Maximum load due to inertia at 1,600 r.p.m.Maximum load due to centrifugal force at 1,400 r.p.m. .. Maximum load due to centrifugal force at 1,600 r.p.m. .. Total load on bolts at 1,400 r.p.m. Total load on bolts at 1,600 r.p.m. Number of bolts .. .. .. •*•• Full diameter of bolts Total cross-sectional area at bottom of thread Stress per sq. in. at 1,400 r.p.m Stress per sq. in. at 1,600 r.p.m... • •••« 3,328 lbs. 4,338 „ 887 „ 1,163 ,, 4.215 .. 5,5oi ,, Four 0.4724 in. 0.580 sq. in. 7,270 lbs. sq. in.. 9.99O „ .-«, deal with the practical problems of Industrial Reconstruction. This is the first of a series of important meetings which the Reconstruction Council is arranging with the object of focussing public opinion upon the tremendous industrial problems that will arise at the end of the war. Applications for tickets should be made to the Secretary, The Industrial Reconstruc- tion Council, 8, Bouverie Street E.C 4. 125
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