When you order coal for the berk do you specify a certain size so it fits the stoker tube correctly. In 12 inches to the foot about what size can stoker coal be. Some of the coal loads in 0 gauge engines seems a little large for the firebox.
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We order "stoker coal" or "nut coal" for the 765. The size of that type of coal is about the size of your fist.
... coal is quite fragile and my guess it that a few oversize pieces would not be much of a match for the steam driven stoker screw.
Correct.
In fact, at the front end of the stoker tube is a device called the "crusher." If large lumps make their way to the front of the stoker tube, they get crushed into smaller pieces before being delivered to the "pot" and blown into the fire.
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