Honolulu star-bulletin. [volume] (Honolulu [Oahu, Hawaii]) 1912-2010, 1917-02-17


rather than a hard and fast rule This
guide Is the principle of inotc. truck
efficiency.
The reason for the existence OF the
motor truck Is that Il carries more
and goes faster than a horse and
wagon. This is It's fundamental justifi-
cation. A truck constantly working
with a capacity load attains the max.
Imum Of efficiency. According as II is
interrupted in fits daily travel and ac-
cording as Its load falls below It's
rated capacity. by so much does II fail
10 realize the 100 per cent efficiency
Of which II is theoretically capable.
Let us compare, Tor instance, a
single horse and wagon capable OF
carrying half a ton al a speed OF four
miles per hour. with a two-ton truck
which is able TO carry two tons at a
speed OF ~ miles per hour. Using the
speed and load Of the horse-drawn We
hIcle rs units OF comparison. We find
that the truck develops three units
OF speed and carries four units Of load.
Carrying out these figures, We find
that the two-ton truck performs IL
units OF work as compared to single
unit performed by the horse and
wagon. This comparison will be
clearer IL we consider that the truck
carries four times the load but de-
velops only the same speed as the
horse and wagon. In that event the
truck does four times as much work
as the horse and wagon. Now II this
speed is increased to three times that
OF the horse IL will be seen that the
truck not only carries four times as
much hut carries it three times as fast
as the horse-drawn vehicle, making
the relative working efficiency OF the
truck ~ times that Of the horse.
Let US now suppose that this truck,
which is capable CT thrice the speed
and four times the capacity OF single
team, carries its load on a certain trip
at a rate OF eight miles an hour In
asmuch as II DEVELOPS twice the speed
of team and carries four times the
load. 1t still performs eight times as
much work as the team. Imagine that
this truck runs l2 miles an hour ali
day, but carries 1 IL tons in the
morning and only half a ton in the
afternoon. Its average load for the
day is one ton, which is twice the
capacity of the team. and with speed
of three times and load OF twice the
team capacity, II does the work OF
six teams, even though during half
the day 1t was engaged in carrying
load far beneath its capacity
With these facts in mind, we are
able to- produce what may be termed
a formula of motor truck efficiency,
using the efficiency of single horse
and wagon as a standard. This
formula NAV be expressed as follows:
SPEED x LOAD - WORK
As As As
Compared Compared Compared
with Team with Team with Team
Or, leaving off the explanations, which
are now understood. we may say that
SPEEDxLOADEWORK.
This deiinite formula. while not
conclusive. we believe will prove de-
cidedly valuable as a guide to the
business manager in analysing his de-
livery problem. lest he go astray in
the intricscies of confusing analysis.
AidnSpCfldlDn OuSlneeIlnS 10 not an
exact science, although 1t is far better
understood now than ever before.
Many variations win develop in diff
ferent lines Of business as result OF
which the formula above may not &C.
curately disclose the result sought.
In applying this principle to any
delivery problem, the investigator
should remember that it is seldom a
truck develops anywhere near 100 per
cent transportation efficiency. Con-
sidering that such a truck would
travel four times as fast and carry
four times the load of single horse
and wagon, we arrive at the astonish-
ing fact that this single truck would
replace Is single teams. II a power
wagon system could be operated on
such basis. there would be no prob
lem involved. II would pay at once
TO substitute IL for the horse-drawn
system. One should not. however, re-
fuse TO consider the possibilities of a
motor delivery system merely be-
cause. earIv in the examination, il is