I never figured out the physics behind it but a chain doesn’t stand a chance without the end covers installed. I like the wider European ones even better.Rained out, found time to respond.
I should have included all the relevant info again. Lexion Maxflex F540 auger flex header. In flex mode right now. Full finger auger. With strippers set tight, tried it without the fingers(except for the center) last fall, didn't stop the wrapping at all. Tried all positions for the finger eccentric.
Moved on from flat barley to flat canola, and it is feeding well, no wrapping or backfeeding, plugs the feederhouse very occasionally, for good reason when it does. But it is tall tangled plants, which drag eachother in, even leaning straight away, it will take it all in without using the reel. Unlike barley which required standing it all up and feeding it back with the reel very aggressively. The barley feeds into the auger as a fluffy random mess. If we push it too fast, it starts grumbling, then plugs the feederhouse, and by fast I mean much over 2 km/hr, or 700 bushels per hour. ~20% engine load. In canola we are achieving close to 100% engine load, and getting comparable tonnes per hour, running the entire 6 feet of stems through the machine.
dg, thanks for the reminder about the covers for the front of the feeder house. I started to build them last fall, will try installing them and see what happens. What is the theory, does the end of the slats catch material and wrap it around and back out the top?
finger timing is important and make sure the stripper plates are almost touching