Originally posted by bus911:
Has any bendy bus/dd* got stuck before on the road ,what happen
then?
*by trees.
no. if got height restriction there will be signalised warnings
or overhead banners to inform the DD driver. as for bendies, a
skillful driver can manoeurve most difficult city roads, jus like
the bendy trial on 858 at changi airport ptb a few years ago.
Will the bendy bus break into two if it turns too much(i.e.The
driver hold the steering to the extreme right/left and keep on
going , won't it bend too much and the interconnecting will
break)
OR
The bus keeps on reversing with the steering wheel straight with
the 2nd carraige not parallel to the first carriage but bend.
no, it won't break. or else lta wun allow it on singapore roads,
let alone public bus service. they have done the engineering of the
swivel connector throughly to pass the safety test.
as for the reversing part, it is possible but momentarily. to
reverse bending to one side, u have to start reversing a bit to the
opposite side before turning to where u wan to bend for a bendy
bus. you can try to observe how 857 bendy buses reverse out of a
12m end-on berth at yishun interchange on weekends, but nowadays
most buses vacate those lots except to pick up passengers so
bendies can use the space of all 3 berths & dun have to drive
all the way in (like boarding aircraft by walking over
tarmac).
I noticed that dd rear wheels turn a bit when the bus turns. Why
is that so?
yes. tis is something like 4 wheel drive. by turning the rear
wheel in the opposite direction, it reduces the turning radius of
the bus. u have to imagine this one: the bus is turning left, the
front axle wheels turn left, the rear axle wheels turn right a bit.
tis is featured in the SBS 14.5m super long bus, articulated buses,
and also the Transperth 1854 (Mercedes Benz O.500LE CNG bus) that
came to singapore.
Are the both left&right rear wheels moving at the same speed
when the bus(all sorts) turns?
physics+maths question. no. for e.g. if the bus is turning left,
the right wheel needs to cover a greater distance as it is further
away from the imaginary pivot point (on the left flank in this
case) where the bus turns along, and thus the corresponding radius
& circumference is greater. now, since the time taken for both
left & right wheel to manoeurve the turn is the same, speed on
the right wheel, therefore, has to be greater.
if u have noted, in this case, that the left wheel moves very
little at this time. u can imagine if it is an on-the-point turn,
it seems as thought it is sliding to the other direction but not
moving forward until the turning motion is over.
