S690 combine Variable stream vs bullet rotor

[bmich]

Has anyone used the new s series JD combines with variable stream and bullet rotors? How do theses 2 rotors compare in small grains ( wheat,oats,barley,canola,grasseeds). What are the differences in capacity, losses, sample etc?

[FelixThunderduck]

I was in a S series 4 or 5 weeks ago in wheat, barley. It had the bullet rotor( or the tri stream now). Had it for 5 days and worked it next to our 60 and 70 series all with bullet rotors. It seemed to be getting a cleaner sample than our other two combines. We had a rain effected harvest with loads of green material growing up through the crop. Extremely tough conditions for oz. I asked the dealer about the two rotors and he said that the only reason you would get the variable stream rotor is for rice or heavy yeilding and damp crops.

[casefarmer]

That or had wheat like farmerjones cuts

[JD7810]

Howdy

The variable stream rotor has alot more threshing capability compared to the bullet rotor. This means that in easy-medium to thresh small grains, it would pulverise everything flooding the sieves with MOG; reducing capacity and increasing losses.

Tri-stream rotor was doing a great job in the S670 I demoed in wheat and barley. Sample was alot nicer compared to previous STS's as previously said.

Cheers

[joe green]

Originally Posted by JD7810

Howdy

The variable stream rotor has alot more threshing capability compared to the bullet rotor. This means that in easy-medium to thresh small grains, it would pulverise everything flooding the sieves with MOG; reducing capacity and increasing losses.

Tri-stream rotor was doing a great job in the S670 I demoed in wheat and barley. Sample was alot nicer compared to previous STS's as previously said.

Cheers

What about in hard threshing grains like durum, do you think you would end up with more white caps in the variable stream?

[bud]

Originally Posted by JD7810

Howdy

The variable stream rotor has alot more threshing capability compared to the bullet rotor. This means that in easy-medium to thresh small grains, it would pulverise everything flooding the sieves with MOG; reducing capacity and increasing losses.

Tri-stream rotor was doing a great job in the S670 I demoed in wheat and barley. Sample was alot nicer compared to previous STS's as previously said.

Cheers

I think you have it all wrong. If you want to bale the straw Deere recommends the variable stream rotor because it puts out much longer straw to bale. If it was being pulverized more that would make it worse, not better.

The longer more gentle nose on the rotor causes less pulverizing and possibly poorer threshing than the tri stream rotor.

I think in 2 years the variable stream rotor will be the only rotor sold in the S series for small grain. Was told the tri stream rotor is only available because it is better in corn.

[bud]

Originally Posted by joe green

What about in hard threshing grains like durum, do you think you would end up with more white caps in the variable stream?

The rethresher will help a lot with the white caps in the S680 and S690. I have a Case with the rethresher and it works very well.

[Jason Hildebrand]

All Deere literature states that the Variable stream is for small grains and the Bullet for soybeans/corn which is was always designed for.

I would like to see the variable stream actually thresh most of the grain than rely on the rethrasher. But maybe thats wishful thinking.

[ozzyjd]

The Vari stream is mainly for small grains in Canada and rice growers.

[Don Boles]

Originally Posted by joe green

What about in hard threshing grains like durum, do you think you would end up with more white caps in the variable stream?

I wouldn't worry about that Joe, it appears to me S series machines with Variable Stream will thresh clean without as much blocking of concaves or any other special procedures.
Can't help but wonder though if it has more to do with the new tailings system than Variable Stream.