FlightGlobal.com
Home
Premium
Archive
Video
Images
Forum
Atlas
Blogs
Jobs
Shop
RSS
Email Newsletters
You are in:
Home
Aviation History
1919
1919 - 0236.PDF
Comparative Data of Mercedes Engine In view of the similarity of design of the 160 h.p., 180 h.p., and 200 h.p. (high compression) Mercedes engines, the following brief comparison of the leading data is interesting: 160 h.p. 140 mm. 160 mm. 4-5 : 1 102.5 at 1,400 r.p.m. Bore Stroke Compression ratio. Normal b.h.p. and speed, b.h.p. per c.f. 312 b.h.p. stroke vol. b.h.p. per sq. 163.5 b.h.p in. piston area. Normal b.m.e.p. Fuel con sumption per b.h.p. per hour. Diameter of choke tube Capacity of 355 cc. per j So h.p. 140 mm. 160 mm. 4.64 : 1 174 at 1,400 r.p.m. 334 b.h.p. 175 b.h.p. 200 h.p 140 mm 160 mm, 5-73 : 1 204 FEBRUARY 20, 1919 Continued from page 234.) carburettor, the jets being opentd out to suit the engine, and the curves being taken with the throttle fully opened. In the last test a fair amount of trouble was experienced with over-heating, due to the high compression ratio employed, but this was overcome at the expense of petrol consumption. From the general running it is assumed that the normal speed of the engine is in the region of 1,500-1,600 r.p.m., as these are the best running speeds. Below 1,400 r.p.m. the engine is very rough, and it has a very bad period between 1,000-1,200 r.p.m. 11. C.) at i.Ooo r.p.m. 391 b.h.p. 205.4 b.h.p. IOJ lbs. sq. in. 109 lbs. sq. in. 112 lbs. sq. in. 0.58 pt. = 0.522 lb. 24.0 mm. main jets. min. Oil consump- 0.031 pt. tion per = 0.035 lb. b.h.p. per hour. o.545 Pt. — 0.491 lb. 24.0 mm. 355 cc. per min. 0.042 pt. = 0,047 lb. 0.629 pt. = 0.5661b. 24.0 mm. 450 cc. per min. ' (test jet) 250 cc. per min. (standard jet) 0.029 pt. •> 0.032 lb. Inlet opens Inlet closes Exhaust opens. Exhaust closes. Valve Timing 2° L. Top dead centre. 1' 350 L. 400 L. 40 630 E. 400 L. 46' 130 L. io°L. 8°L. L. L E. Inlet .. 0.017 in. 0.017 in. Exhaust ., 0.014 in. 0.015 in. Magneto 30° E. 300 E. 30° E. timing. Tests Three sets of calibration curves were taken in the following order :—(a) With the carburettor opened out to its maximum position for ground level running ; (b) With the sliding air valves fixed at the base of the choke tubes and the throttle fully opened ; (c) With a 180 h.p. Mercedes carburettor (which had no altitude control) fitted in place of the standard EB B No Huge Machines •* ADDRESSING members of the City of London United Wards Club the other day, Mr. Handley Page said he was convinced we should not have huge machines carrying Summary of Power Curves, r.p.m. 1,200 Para, as above b.h.p b.m.e.p. lbs./in. Petrol consumption pt. b.h.p./ hr. r.p.m. Para, as above b.h.p b.m.e.p. lbs./in. Petrol consumption pt. b.h.p./ hr. r.p.m (a) (b) (c) 148.5 144-5 151 108.5 105.5 no •515 650 .680 1,400 . . A. _ , . («) 164 IO2.5 •511 (*) 174 109 (c) 1 So 112, •590 5 645 1,600 Para, as above .. .. (a) (b) (e) b.h.p. .. .. .. ..171 186 204 b.m.e.p. lbs./in. .. .. 94 102 ill.9 Petrol consumption pt. b.h.p./ .520 .590 .629 hr. Maximum power recorded.—217 b.h.p. at 1,750 r.p.m. Induction pipe depressions were taken between Nos. 1 and 2 cylinders. (See Calibration Curves, Fig. 8.) Subsequently two one hour duration tests were carried out—1 at 1,500 r.p.m., 1 at 1,600 r.p.m. r.p.m. Average b.h.p. Average water inlet temperature. Average water outlet .temperature. Average oil pressure Average oil temperature in tank. Oil consumption Petrol consumption i,5°° 168 6o°C. 67 ° C. 20 lbs. sq. in. 23° C. 4 pts. per hour = .024 pt.'h.p. hr. 91 pts./hr. — • 54 pt./h.p./hr. i,6oo 171 58° c. 63° C. 20 lbs. sq. in. 20°C. 5 pts. per hour 1 = .029 pt./h.p./ hr. 96.5 pts./hr. m .565 pt./h.p./hr. m ® hundreds of passengers ; the great thing that the aeroplane would do was to provide'quick transit over very long dis tances. By the next generation the full use of the aeroplanes would be realised. The Sunbeam " COSSACK," 12-cylinder engine of 320 h.p. 236
Sign up to
Flight Digital Magazine
Flight Print Magazine
Airline Business Magazine
E-newsletters
RSS
Events
