green456:
lol, i knew this was comingâŚi`ve just been out for an hour and while i was away, i thought â[zb]!, i meant to put 2nd and thirdââŚif third axle applies on every two axle unit that i have ever seen the Fifth wheel has def been in front of the drive axle not behind it, but its still known as the fifth wheel
LOL, just what i was told by my instructor, i`d like to add at this point that i dont drive Artics nor have the necessary license! Maybe i should brush up for when i do decide to take the next step!
Stonehouse69:
LOL, just what i was told by my instructor, i`d like to add at this point that i dont drive Artics nor have the necessary license! Maybe i should brush up for when i do decide to take the next step!
In which case i would simply have marked the Q as âN/A to license classâ
Original birth certificate Tell 'em go take a hike. Mineâs never been out of the house in the last 43 years.
Driveroneuk:
Original birth certificate Tell 'em go take a hike. Mineâs never been out of the house in the last 43 years.
This is because all employers have a legal resposnsobility (big fine possible) to make sure that you have the right to work in this country. ie. You are a British Citizen. A passport should have been sufficient though.
its called a fifth wheel because it holds a fifth of the trailers weight"
An articulated semi-trailer must be designed so that 20% of its weigh must be superimposed onto the turntable of the drawing unit, seems to me that this girl wasnât far wrong.
hello, she was right about the 5th wheel âits called a fifth wheel because it holds a fifth of the trailers weightâ but the other stuff she asked for i would have told her to â â off!
You guys are WRONG. The fifth wheel doesnât take a fifth of the weight. If a load was spread evenly down the length of a standard trailer then I would guess that about half would be on the kingpin and half on the rear axles. Think about it - with an evenly spread 25 tonne load then only 5 tonnes would be on the pin and the rest on the rear axles.
My explanation above makes much more sense - it (like so much other truck related stuff) goes back to horses and carts.
Santa:
You guys are WRONG. The fifth wheel doesnât take a fifth of the weight. If a load was spread evenly down the length of a standard trailer then I would guess that about half would be on the kingpin and half on the rear axles. Think about it - with an evenly spread 25 tonne load then only 5 tonnes would be on the pin and the rest on the rear axles.
Which, on a tri-axle trailer would be 6.66 tonnes per axle.
Stonehouse69:
@ Santa, i heard that fifth wheel tale too, but chose to go with the more âupto dateâ one
Given that they have been called 5th wheels for many, many years donât you think it would make more sense to go with the older, and correct version, rather than some new nonsense someone has pulled out their â â â ?
The thing about it taking a 5th of the weight is just another good old driverâs myth.
horse and cart, or one fifth on the weight?..
i like this betterâŚ
In the days of horse-drawn wagons, due to bad surfaces and conditions, it was difficult to keep the front wheels on the ground when turning. so the spare wheel, (the fifth wheel ) was placed horizontally over the front axle of a large wagon to facilitate turning. Basically, it allowed the front axle to pivot.
Today, the coupler of a tractor-trailer truck is called the fifth wheel, mostly because itâs round (somewhat) and is vaguely reminiscent of the wagonâs fifth wheel.
IIRC, a typical fully-freighted artic with tri-axle trailer will show an axle weight of around 8 tonnes per trailer axle. A loaded trailer weighs around 36 tonnes, (44 tonnes minus the weight of the tractor) 24 tonnes of this is borne by the trailer axles and so around a third of the weight is borne by the fifth wheel.
This was included in the operator cpc when i did it and it states an articulated vehicle. A heavy motor car or motor car with a trailor superimposed on it so that when the trailor is loaded not less than 20% of the weight of the trailor is borne by the drawing vehicle. When coupled up an articulated vehicle is treated as a motor plus trailor.
Santa:
You guys are WRONG. The fifth wheel doesnât take a fifth of the weight. If a load was spread evenly down the length of a standard trailer then I would guess that about half would be on the kingpin and half on the rear axles. Think about it - with an evenly spread 25 tonne load then only 5 tonnes would be on the pin and the rest on the rear axles.
My explanation above makes much more sense - it (like so much other truck related stuff) goes back to horses and carts.
What weight would be on the pin on an EMPTY trailer though?
You might find that the manufacturers follow a spec of an empty trailer having 20% of itâs weight on the pin.