Super Single Tires

Look, I don't care what someone says. All I do care is, what engineers provide. They provided that wheelbase, and I did calculations for it - it was an tag axle from the very beginning, and I simply didn't give a ####, about lenght. Just used same dimmensions, for calculating pusher, tag, and double drive.

The whole point was to show, how the weight redistributed, when you lift some of the axles. I showed what has been now for ages, and any Scandic driver will tell you - pusher is useless in winter time.

If you want to show me, that my calculations are wrong, do them by yourself, and show me what you've got.

 

it is not possible to get -P result on 6x4 truck on front axle at all except if you use leaf springs and put 5th wheel behind middle of rear axles, and this does not exist


i understand basics of what did you want to show and this is good but calculations does not match those from real world 5th wheel is more forward ...

 

Look, it's only trailer load - add heavy engine, cab, and weight of frame itself, and you won't get -P on front.

Other thing is, if you move 5th wheel to certain position, and lift tag you MAY not be able to steer on certain conditions. I've heard of that, but those trucks were some kind of redneck engineered, and they simply weren't calculated right.

 

Okay, let me put it this way, show me, where axles should be, on 6x4 (position from left, like right now, front wheel is 720 etc.), where exactly i should put 5th wheel, and I will recalculate the whole thing from very begininning, for you, but trust me, there will be just slight number difference, nothing important.

 

ps sorry my licence just expired on autocad last week so i do this in solidworks as 2d sketch

 

Would the overall length of the chassis have anything to do with it? Just a thought

 

Okay, my fault, 0.06 on front axle, 0.54 on middle one, 0.40 on last, when putting those dimmensions you showed.

Strange, the major difference, was pretty much only the 5th wheel position, I know they like to slide them on 6x2, but when it comes to 6x4, do they offer sliding 5th wheel here in Europe ?

But still, needed to calculate pusher and tag, while trying to see, what happends with double drive, and numberes didn't differ much on those. Front still lifts on tag.

 

well there are few important things

-wheelbase

-theoretical wheelbase

-5th wheel location

i found:

0.1P on 6x4 on front axle
0.25P on 6x2 with lead axle on front axle+load of raised axle would give you about another 300-330kg

and on 6x2

-0.48P if 5th wheel is in 140mm position( for comply eu standards for 16.5m length)

and also -450/550kg from raised tag ( depending if it is single or twin tire tag)

 

Okay, my fault, 0.06 on front axle, 0.54 on middle one, 0.40 on last, when putting those dimmensions you showed.

if i take 3300mm wheelbase and 290mm 5th wheel location and 1355mm between bogie i get 0.097P on front axle

0.45on front drive and 0.45 on rear drive

you should count that it always shares weight both as spring suspension and as air you can only add small difference of powerdevider and larger driveshaft but this is only 100kg-150kg more on front drive



Strange, the major difference, was pretty much only the 5th wheel position, I know they like to slide them on 6x2, but when it comes to 6x4, do they offer sliding 5th wheel here in Europe ?

yes but what did i see from your last few of posts that this is not your profession ( i mean calculations and this) i deal with mechanical engineering and i am well familiar with all measures

they offer slidable 5th wheel on all kind of trucks just there is no need for it on 4x2 because we pull only iso1726trailers with them

while scandinavians need to adopt to different trailer sizes

But still, needed to calculate pusher and tag, while trying to see, what happends with double drive, and numberes didn't differ much on those. Front still lifts on tag.

but we could even calculate what will happened if you shift weight on 6x4 from 3rd to 2nd axle this is more problem....