|View static image|
|Number of cells||5, 11|
|Recovery time||33 ticks|
|Discovered by||David Buckingham|
|Year of discovery||1972|
RF28B is a converter with several known forms, most of which were found by Dave Buckingham between 1972 and the early 1980s. It accepts an R-pentomino as input and produces an output B-heptaplet 28 ticks later. Of nine major variants known as of the end of 2017, four versions are shown below.
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RLE: here Plaintext: here
The top variant above is part of the L156 Herschel conduit, but it can be replaced by the variant below it which produces a forward glider output. A B-heptomino naturally evolves into a Herschel, as shown above -- but it leaves an extra block behind which must then be cleaned up before the circuit can be used again. The third variant can be combined with a boojum reflector or rectifier to clean up this block.
Note that flipping the loaf in the third variant and shifting it one cell down will yield the very similar looking RF48H. This is a completely different conduit, producing a Herschel without leaving the extra block.