Page
TUBULAR RADIA- TORS.
INTERESTING EXPERI-
MENTS.
IT
THE HONG KONG DAILY PRESS. WEDNESDAY, APRIL 24, 1929.
MOTOR
SPECIAL PURPOSE
VEHICLES.
NOTES.
hour.
curs of the three to five litre class by covering 1,7187 miles in 24 hours. At an average speed of 72 miles an
་ད Now this is a very poor per formance compared with Mr. Gil lett's performance of 4 hours at 4 litre &cylinder Moatllery on Acedes when he covered 1,881 miles at an average speed of 39.38 miles per hour.
lation, it was observed that the smallest radiator to dissipate a given amount of heat was one built Only up with in plain tubes. when in. tubes were used did the gilled tube show up better than the plain one. The use of small, plain tubes, however, was accompanied by certain drawbacks; for example, increased difficulty in manufactur- At a meeting of the Manchestoring the tube block, greater pos-
Great: interest has been aroused Centre of the Institution of Auto-sibility of tube stoppage, and lower by the announcement that a huge
transverse strength of tubes. mobil Engineers a paper was read view of these considerations, the wheeler machine, more than 63 by Messrs. E. Kerr Thomas and E authors expressed a preference for overall, is under construction at C. Wadlow on "The performance in. gilled tubes for thermo-syphon, the Scammell works. This has been, of tubular radiators for motor radiators. This size of tube also designed to transport exceptional had the further advantage of being loads of 100 tons or more, such as vehicles. In the experiments des associated with a low critical water heavy machinery, which hitherto eribed, nine tubes, of different dia-
of traction engines and trailere meters, plain, and having diferent speed, which might be exceeded have been dealt with by a number when conditions became very
The Scammell's road speed will be arrangements of gills attached to
increased them, were selected to cover the severe, resulting in an
rate of heat dissipation. The pre-about double that of its predecessors range of sizes employed in multi-
sence of a rough interior tinned and it will need a crow of only
instead of 19 while owing to its
"I do think this British record tubular radiators used at the pet surface was also helpful in promot rubber tyred wheels no damage will of the Acedes should be remember. sent time. All the tubes were madeing turbulence in the water fow.
be done to the road surface. of brass, except those of one-
With pump circulation, in nearly
There are a number of most ined when this large American car
recard is talked about." quarter of an inch in diameter every case it was observed that the which were of copper. The gills were tinned inside and outside, but gilled tubes were more efficient than genious features about the latest from the Dennis factory. Other- the plain tubes were not tinned plain ones, irrespective of size. type of refuse carrying machine
This difference affected the nature Again, a given volume of a wise based on the very successful of wetted surface and altered the able to dissipate the greatest Dennis 30 cwt.' chassis it is fitted
constant difference between mean
tubes, either plain or gilled, was amount of heat.
+
Syphon or Pump?
"The Acedes ran 30 easily and nicely that Mr. Gillet was able to self, whereas this record referred drive the 24 hours throughout him to of the three to five litre car took no less than three drivers to keep it going to 94 hours.
"ו.
MASS PRODUCTION FOR AEROPLANES.
4.
PROGRAMME ADOPTED BY THE FORD INTERESTS.
with 2 in. wheels which bring the frame level down to 21 in. The top of the body side is thuis only 1 ft. 4 in. from the ground. The Detroit, April 11:-The Ford pro- metal body has a capacity of 7 cu. Motors interests have placed their
manufacturing yds. and the top is fitted with alid-aeroplane hydraulic gear is provided and the Mr. Henry Ford, head of the com- gramme on a mass production basis, ing covers. For emptying purposes absence of wheel arches and elever panies, announced today. body shape, a few inches wider at clear chute. "The
Actual internal diameter of the Tinned tubes to a slight extent. Each tube was tested with a view! to determining the following fac
A further question arose concern- tors: (a) The effect of water speeding the desirability of employing through the tube upon the heat dis- either thermo-syphon or pump cir- sipated with consant air speed, and culation. Using in. gilled tubes, the size of radiator necessary to dissipate a given quantity of heat would be, for thermo-syphon circu- lation, about twice the site neces- the rear, ensure sary when a pump was employed. driver's seat is recessed into the With other sizes of tube the ratio forward end of the body, anar-his belief that the manufacturing was smaller, but even in circum- rangement which gives greater load stances most favourable to thermo-capacity and better distribution syphen cooling a radiator about 20 over the front and rear axles. per cent, larger than that required
water temperature and air inlet temperature; (3) the effect of air speed upon the heat dissipated with constant air speed and con- ..stant difference between mean water temperature and air inlet tempera- ture; (c) the effect of varying the difference between the mean water and air inlet temperatures when water air speeds were kept con
stant.
Some Drawbacks.
I
pump circulation was employed would be necessary. From best transmission considerations alone The basic value of water and air pump circulation was desirable for speed, were, respectively, ift. and onerous conditions; many other 50ft, per second, and the experi- factors, however, entered into the ments were carried out with the dil problem-the economic aspect, the ference between mean water tem-effect upon engine performance, and perature and air inlet temperature the like-and the authors did not as near to 90 degrees F. as was pos- feel justified in making recommen-
With thermo-syphon circu-i dations op this point.
sible.
SPEED RECORDS.
LETTER FROM MR. S. F. EDGE
Following his interview at the opening of the Detroit Aeroplane show yesterday, when he declared
af seroplanes must proceed along the same lines as that of automo biles, Mr. Ford today announced that production figures for the com- ing period have been 7,000, for the smaller Ford planes and 10,000 for the Ford three-motored transport 'planes.
We have received the following, The same programme will be inctories as in the automobile fac- letter from Mr. S. F. Edge, of Afollowed in the Ford aeroplane C. Cars, Ltd.:-
teries, the manufacturer indicated, vance for each period, based on the and production figures sec in ad reports of the sales organization.
I have been reading recently in the papers that Messrs. E. A. D. Eldrige, Kaye Don and G. E. T. Eyston beat the 24-hour record for
Ꮧ
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Austin
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TEL. K. 1486.
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Coach
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The big, tough diamond blocks in the contre grip the road. The two ribs add support and strength to insure slow, even tread wear. Tread blocks extended up the sidewalls supply. needed traction on turns.
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3-28-23
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Prince's Building, 2nd Floor..
Telephone: C. 27.
HONG KONG
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