3 axle Fendt TRISIX Vario

[radman1]

It looks like a 4WD tractor with a extra set of wheels in the rear. The engines seems to be mounted forward of the front axle, and the cab over the mid axle and an extra set of axles behind the cab. I would guess most weighted mounted in front. I suppose it has a set of lift arms in the rear.

 

[Renze]

Sorry guys, the yellow PB 400 might be the predecessor of the Trisix, but it has nothing to do with Fendt: Though it has a simple 14 speed synchro gearbox, the PB 400 has a much more sophisticated undercarriage with more suspension travel and less wheel inclination.
http://www.farmvideo.cz/videa/pb+disker.wmv

It is built by a guy named Dvorak, a private farmer in the Czech republic, and its based on a 400 hp V8 engine and chassis of a Tatra offroad truck.
Tatra is the only truck maker in the world to utilise independent wheel suspension on heavy trucks. They have their own patented design, which has been unique since its invention in the 30's.TATRA, a. s.


Anyways, the Trisix is just a concept: It wont make it on our European fields: the trend is towards min-till and direct sowing. Who needs 540 hp anyways when you dont plough anymore ?

Some people think that a 19 ton monster like this, will be on the road competing with the trucks: In Germany trucks are limited to 40 ton. The trisix is 12 ton heavier than a standard European highway semitrailer truck, so it will take 12 ton less payload with the same GCWR..... not very economical.
Also, Ag tires have a lot more rolling friction than hard pumped truck tires, and the Ag tires will wear out very quickly at 65 km/h

It is known that the Fendt 936 (360 hp standard frame tractor) is on the limit: In many conditions it just cant get the 360 horses to the ground.

An articulated tractor (or a 2+2 concept based on current production models) would put more horses to the ground than a standard frame tractor, with much better visibility and manouverability, at a lower cost.

The width is important on European roads: the Trisix is wasting width because it needs clearance between the tires and the motorhood, to turn the wheels for steering:
With an articulated tractor or 2+2, one could simply slide the tires inwards untill they allmost touch the engine, because the frame articulates, and not the wheels individually. lets say 100 cm with between the fenders and 5 cm clearance means that you can fit 80 cm wide tires and keep within the width of a Trisix...

I think its destiny is the same as the Versatile Big Roy, about 30 years ago: It will make a remarkable museum piece and it will be discussed about for generations, but it will never be sold.... just my 2ct$

 

[ScottAR]

Robert, I don't know exactly how the weight should be set although I think more on the front wouldn't hurt too much if the drawbar was mounted high enough to transfer some weight. I would love to see this thing with some pans behind it.
A good test for any 4wd tractor's brute power. I've seen 400+hp Cases stop with all 8 tires spinning pulling pans in heavy red clay.

 

[slowzuki]

Oshkosh have some heavy truck with independent suspension now too.

Tatra is the only truck maker in the world to utilise independent wheel suspension on heavy trucks.

 

[Renze]

Oshkosh have some heavy truck with independent suspension now too.

I looked at the Oshkosh website, and you're right..
I still prefer the Tatra concept due to simplicity, less U-joints, better protection of driveshafts, and a more stable platform with the monotube frame...

 

[jjmarotz]

One thing I noticed was the disk was not going very deep into the soil. Toward the end of the video it looks to me that it is really only skipping over the suface. I would like to know if that size of disk could really be pulled that fast if it were dropped to full working depth. One would think that it could not be done as drag and torque factors come into play with any implement at different depths. Just curious I guess. Still a mean looking rig either way.

 

[Robert_in_NY]

One thing I noticed was the disk was not going very deep into the soil. Toward the end of the video it looks to me that it is really only skipping over the suface. I would like to know if that size of disk could really be pulled that fast if it were dropped to full working depth. One would think that it could not be done as drag and torque factors come into play with any implement at different depths. Just curious I guess. Still a mean looking rig either way.

It is hard to tell but I do think he is raising the disc for those sharp turns. Once he has completed the turn he lowers it back down. Again, it is hard to tell but that is what it looks like to me.

 

[Renze]

YouTube - Original Tatra Backbone Tube Concept

some more about the unique central backbone concept.

 

[Robert_in_NY]

YouTube - Original Tatra Backbone Tube Concept

some more about the unique central backbone concept.

Thanks for that link. That is an different axle setup and the first I have ever seen like that.

This video shows the axles in action. The truck looks more insect then truck if you just watch the wheels and how they follow the ground contour. I wonder how this truck would do on my soft gound , I might have to take out every other row of the orchard if I want to use it to get a couple bushel of apples

YouTube - Tatra T813 Kolos - Mirów

 

[Renze]

Robert, the one you showed would allmost be an insect, as its an RC model

Here is a pic of the 1967 model 8x8 813 in the European Truck Trial competition: 90% of the competition is Tatra 813
YouTube - Truck Trial Balve 2007 3