peterm:
Well I reckon it’s s88t design. I know there ain’t as much room on the roads over there, compared to Australia (in general) but putting the axles where they belong… at the back instead of halfway along is always going to be better. The design tries to squeeze a 40’ trailer in to the space of something like a 30’. So you’ve got huge tail swing and because you’ve also got a long pin (about 4 or 5’ from the headboard) the front corner comes in to play as well.
Got me tin hat on boys.
No need for the tin hat spot on.Except it’s more case of them trying to put a 45 foot and now even 50 foot trailer into the same pin to axle measurement.All on the basis that putting it on the overhangs supposedly magics the length down to 30 feet.
Carryfast:
It’s all about rear/trailer axle position and resulting overhang.In general we’ve got a type approval regime which is too biased in favour of less cut in at the expense of tail sweep.When better axle positioning would allow the type of natural driver approach which is biased to allowing for more cut in.As shown in the vid among others.
Can I translate that to doing less of an arc which resulted in the rear axle getting too close to the offside, because the driver was overly concerned about cutting in?
If so great!
It translates as the driver has used natural instinct to approach the turn in ( what would be ) the ‘right’ place where it should be.It’s just that the rule makers won’t allow it by putting the rear/trailer axles too far forward.Which then means balancing the resulting reduced cut in against the increased tail sweep by approaching in the ‘wrong’ place tighter to the turn.IE he wasn’t ‘overly concerned’ about cut in.It’s more a case of the natural driver reaction is to ( rightly ) allow for maximum cut in and minimum tail sweep.While the rule makers have gone for the idea of reducing cut in at the expense of tail sweep.Which from a driver’s perspective just means two problems to deal with instead of just one because one has to be balanced against the other on the approach.Resulting in the type of example shown.
The pivot point of a standard tri axle trailer is the hub of the centre axle, not the rear axle. If screwing round 180* such as in a tight yard (best done empty, better avoided altogether) watch the inside trl wheels carefully you will see the front axle is dragged sideways whilst the rear axle is pushed sideways the opposite way.
Driveroneuk:
The pivot point of standard tri axle trailer is the hub of the centre axle, not the rear axle. If screwing round 180* such as in a tight yard (best done empty, better avoided altogether) watch the inside trl wheels carefully you will see the front axle is dragged sideways whilst the rear axle is pushed sideways the opposite way.
Wheel nut and tyre killer. Only ever did it empty and then on soft surfaces like dirt. I’ll hold my hand up and admit I did it loaded once on boxes whilst on Tarmac as a young and new driver, over cooked it and tore off the tread from one of the cheap arse retreads on my trailer. I saw others do it including shunters and thought it was normal. Never did it again loaded. Felt very guilty I’d damaged my truck through my mishandling and over estimating what was the norm. I learnt that day
Driveroneuk:
The pivot point of standard tri axle trailer is the hub of the centre axle, not the rear axle. If screwing round 180* such as in a tight yard (best done empty, better avoided altogether) watch the inside trl wheels carefully you will see the front axle is dragged sideways whilst the rear axle is pushed sideways the opposite way.
Wheel nut and tyre killer. Only ever did it empty and then on soft surfaces like dirt. I’ll hold my hand up and admit I did it loaded once on boxes whilst on Tarmac as a young and new driver, over cooked it and tore off the tread from one of the cheap arse retreads on my trailer. I saw others do it including shunters and thought it was normal. Never did it again loaded. Felt very guilty I’d damaged my truck through my mishandling and over estimating what was the norm. I learnt that day
The rule of pivot points where cut in turns to tail sweep still stands even if it’s just an ordinary tight turn like putting it on or turning out of a loading bay or parking place through 90 degrees.Especially if you’ve got other wagons parked close on each side.On that note,bearing in mind how an artic is actually designed to make a turn,a degree of tyre scrub and ‘fight’,especially between tri axle trailer axles,is unavoidable in many cases.The issue being the amounts of tail sweep caused by the rule makers’ preference for minimising cut in at the expense of tail sweep by axle positioning.
