THE HONGKONG TELEGRAPH, MOTORING SUPPLEMENT. SATURDAY, FEBRUARY 14, 1931.
MACADAM'S INVEN-mingle with the old under pressure,
TION.
but it seemed the height of folly to try to mend a road by first break- ing up its surface,
What Scottish Engineer stones Macadam demanded different
DIESEL ENGINE GAINING.
Simplicity and Safety of Oil-Burning Motors.
Even in the breaking of tho
methods. He found that stone- Did for Roads. breakers sitting down worked with less fatigue than when standing up; thus he was able to employ youtha REVOLUTION IN
jand old men, and so to reduce the
FOR AIRCRAFT OF THE FUTURE. cost of labour. The size to which CONSTRUCTION. the stones were to be broken was determined by experiment. The
There is a trend in aero onginesty for the compression Ignition The name of John Louden Ma-area of contact of an ordinary toward the compression Ignition, engine. But there are other and cadam te honoured among road wheel with the road was about an or Diesel,, principle. Only a few more weighty factors to be taken In the first users, for he was the first to show inch lengthwise, and so he decided years ago the impossibility of into consideration. that roads could be good, service that none of his stones should be building super aeroplanes and dy place oil fuel used by the Diesel able, cheap and lusting.
more than an inch in any of its in beata was stressed, writes type is to all intents and purposes In the engine His metleda have since been dimensions. If it were more than T. G. Martyn. Germany proved non-inflammable. superseded to some extent, but an inch, then a wheel passing over not only that the construction of It is ignited under the heat of the mendamised ronds are still plenti- it would tend to raise the other end, such plaves was practical but that tremendous compression of air in of them and so the surface would noon be she has built were possible. As fuel oil, of the type that is used machines even larger than these the cylinders, into which atomized fol, although low users know anything about the revolution ruined. Surveyors carried about ttle an two years ago America in the ordinary household furnace, wrought by the engineer from Ayr. with them scales and weighed the
was woefully behind Europe In is injected. Sluce oll fuel is If ronds were minde at all before largest slimes in the hemps, and the matter of big flying craft: practically non-volatile, to use it Meendam's time they were intricate which weighed more than six ounces
to-day she is creeping into the at all it must be nearly perfectly Tairs consisting of piles, sub had to be broken up. ronds, and the road proper. Maca In constructing a new road Muen-end, with the Fokker F-32 head-atomized." dam declared that good roads could dam worked on what he called the list, and even larger planes
with
doubtless to conic.
Firing by Compression.
The method of firing by com- pression instead of by an electric No Spark does away with all the
I minde without all this prepara-three times"-that is, be applied History is rupealing itself with tion, and, instead of renda 4ft, layer of stones four inches thick regard to the nero engine, although thick, he made roads ten Inches and worked that down well thick.
rollers: then another layer, and the disparity is not so great. Put very briefly, his discovery then the final layer, and no binding engine built in America can touch paraphernalia of magnetos, spark the performance of the Rolls- plugs, etc. Moreover, it obviates WIH that atones broken small, material was used.
Royce engine fitted in the Super the necessity of shielding the gna shaken and then pressed together As the first requisite in rouil-Marine Napter which won the engine to prevent undue inter- by traffic, rapidly settled down face making was toughness, Macadam Schneider Trophy for Great farence, owing to the electrical to face and angle with angle, and favoured whinstone, fint, limestone Britain, an engine that developed current generated, to radio re-
Limestone hnd made as close a mass as a wall. and pebbles.
anore than 1,000 horsepower for a ception. The Diesel type offers This meant that roads were dryer, tendency to absorb moisture and to total weight of less than 1000 no such interference, and radio: harder, freer from mud and dust, break up under frost, but it was
pounds.
becoming ever more Important to and undisturbed by extremes of cheap.
aviation, this single factor is of temperature. Macadam showed
significant importanes. that new roads could be made at n cost of £88 per mile, while the cost of repairs for old roads was £470 per mile per annum.
Macadam did not benefit grently from his discovery, for the granti of £10,000 made to him by Parlia- | ment was little more than the eum he had expenderi in proving that For the repairs. of his roads or roads could be made, Macadam always chose wet weather But he has his reward, for his and loosened the hardened surface man is enshrined in the dictionary, with a pick before putting in the his memory preserved am ng frat broken stones. This meant, all who make, ne, or plan new -obviously. that The
would ronds.
HOW
SUPPRESSED DESIRE.
GEL U. B. PA). OIT. 1931 BY NCA SERVICE, INC. 2.1
Suppressed desire.
word that the new Towle resultant explosion. Nothing
use
IL
Available in Several Planer, But we (America) have a coni- Then there is the question of pression ignition static radial enrburetion. The Diesel type has engine in the very forefront of no carburettor and is therefore this type of engine developm at. not subject to the many maladies In fact it is the only radial cons-which are prone to affect the gur pression ignition engine in the engine. The Diesel motor has a
for. pump
ench world, developed by the Packard special fuel Motor Company Aircraft manu-cylinder, of the ordinary simple facturers, including Ford, Stire-plunger type. The action of the
Bellanea, Verville and Wach, have alrendy made it possible tomp forces the oil up to the to cylinder. atomizes it while inject- obtain certain of their modelsing it into the highly compressed with this engine. Now comer nlr Inside of the cylinder, with
amphibian, made in Detroit, will could be simpler. There is no two of these motors as Intricate mechanism to go out of standard equipment. Other coun-order and no possibility of feed tries. particularly Germany
lines clogging or breaking. where the Junkers company has Tong been engaged in the develop- Supercharger Not Required. ment of beavy oil engines, and Ench cylinder of the Packar={ England, where the Sunbeam engine his but one valve which, Company has developed a fairly in conjunction with a ventari on successful engine of the same the top of the cylinder, acts as type, are doing some intensive rean inlet and an outlet port. search and practical work on the is a four-cycle engine. The air in stationary water-cooled Diesel drawn in through the valve; the type, which is admittedly capable valve clases; the upthrust of the (of producing a very high horse-
piston compresses the air until it reaches a temperature of about 1,000 degrees Fahrenheit; the utomized, of is shut into the eylinder just before complete com. pression and the explosion takes Compared with Ordinary Type. place; the piston is driven down; Let us first compare the Packard the valve opens; the dead gases Diesel with a conventional electric are expelled; the venturi carries ignition static radial engine of off these gases and as they are the same horsepower. The dif-expelled a fresh supply of clean ference in the bore and stroke is air la drawn toward the valve, at infinitesimal, 3-16 of an inch for the same time cooling. it. There the bore and half an inch for the is thus no possibility of the stroke. The giseline engine mixture being affected by atmos- develops 226 horsepower at 2,000 perle conditions, which does revolutions por. minute, the away with supercharging, Packard Diesel the same horse- Finally, it is to be noted that power at 1,950 revolutions per the extreme simplicity of con- minute.
The gas engine weighs struction, robust though it has to 450 pounds, or exactly two pounds be to withstand the external pres- per horsepower;
the
Packard sures, le an excellent guarantee weighs 510 pounds, or 2.20 pounds against engine failure. Think of per horsepower, The fuel con-all the many things that can cause sumption of the gus engine is 55 engine fullure in a conventional pounds per horsepower hour; the gna engine and contrast them with of engine averages 43 pounds per possible causes of engine failure horsepower hour. The oil con-in a compression ignition engine. sumption is 03 pounds per horse. It will be found that there is, power hour for the gas engine and practically speaking, only one 04 pounds per horsepower hour thing which might cause the for the oil engine.
latter type of engine to fall—that
power.
Why is it that the compression ignition engine promises so much for the future of aviation?
A close comparison of these is breakage. And even a broak statistics, therefore, doer not is not likely to occur, because the reveal any preponderant superiori-lengine hau to be built ruggedly.
BUICK
for
1.9 31
Another shipment of the 1931 Model Buick Straight Eight Motor Cars hus arriveıl, We cordially Invite you in come in and inspect the 'Eight with BUICK'S Prestige ---you will then understand why more than 2,600,000 people have chosen Buicks
again and again. A
BUICK HAS AGAIN BUILT A BETTER AUTOMOBILE.
Why not let an take you for a drive in one of these new Buick Great Elghts-and let you see for yourself how much move Buick glyos for less money.
14" Wheelbase Buick Models..
#18" Wheelbase Bulck Modols.
„124′′ Wheelbare' Bulck Models..
132" Wheelbas Buick Models.
G$1,530 to G$1,655
G$1,820 to $1,900
G82,180 to $2,195 G82.160 to G$2,705
THE DRAGON MOTOR CAR Co., Ltd.
TELEPHONE 30228.
38, Wang Nei Chung Road, Happy Valley
$3,300
HONGKONG CURRENCY
!!
FIAT 520
SIX-CYLINDERS!
TRUMP THAT!
Arrange for an early demonstration.
Service Station FIAT GARAGE
and
LANCIA GARAGE Hennessy Road.
is now
Tel. 24841.
Tel. 23557.
A. GOEKE & Co.
Tel. 22221.
FIAT
AGENTS.
Spare Parts Dept.
CHINA BUIDING
Fourth Floor.
Tel. 224221.
The Packard Company Gnally transferred to the engine by great step forward for the gaso- gave up the idea of starting the means of a clutch and is sufficient line engine, for it also atomizes {fuel_oil_as_eflciently_sa gasoline. gine by firing-a-cartridge. It-to-turn-it-over.
started by an inertia Pratt and Whitney have for and makes that safe fuel usable starter, electrically operated so long been experimenting with a for the conventional electrical It does not do that its fly-wheel attains 7,000 now system of atomizing.gasoline, ignition engine.
The which does away with the neces away with the electrical equip- revolutions momentum of this wheel is thenalty of a, carbureltor. This is a ment.
£ minute.
A POWERFUL HILL CLIMBER
7HETHER touring in the Alps or the Andes this new and moderately priced Nash Straight-Eight gives unusually satisfactory performance.
Its power to climb hills and to accelerate quickly is sup- plied by the sturdy high compression 9-bearing Straight. Eight eugine of 75 horsepower.
Luxurious riding comfort, ease of handling and fine car performance combine with a beauty of body line to make the Eight-77 Special Sedan, above, the most popular motor car in its price class.
Before buying any car why not see this new Nash Straight. Eight? Also, two larger Straight-Eights and the new low priced Nash Six on display at our showrooms.
THE
The Oriental Motor Co.
868, Hennessy, Road, Hongkong,
NEW NASH