[modeleng] Rosebud Grates

There is an interesting article in the latest AME on "Rosebud" fire grates 
something that I hadn't heard of before. the author Les Phillips wasn't sure 
where they originated. ( maybe somebody can enlighten me) they look to be 
simple to make just a flat plate with drilled holes chamfered on the underside. 
 Les's experiments burning char show that an air space to solid ratio of 10% is 
best,  that was after working his way down from 50% which is usually 
recommended for coal.
Has anyone any knowledge of these grates, good or bad.
Lee
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