The heel is the small more-or-less triangular piece at the back of the landside. An adjustable heel is mounted with the bolt in a slot so the heel can be moved back/down on the landside. It mostly shows up on later plows.
For older plow bottoms, "high speed" means speeds up to 5 mph without throwing the dirt too far. Many of the older moldboard designs turned the soil too sharply and would only do a good job at lower speeds. I think the high speed bottoms started becomeing popular before steel wheels had totally lost favor. So a high speed bottom combined with steel wheels may not be real common, but probably not all that unusual.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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