Fly-by deletion

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Fly-by deletion is a reaction performed by a passing convoy of spaceships which deletes a common stationary object without harming the convoy. Fly-by deletion is often used in the construction of puffers and spaceships to clean up unwanted debris.

For c/2 convoys this is not usually difficult since the LWSS, MWSS, and HWSS spaceships have such useful sparks. However, some objects are more difficult to delete. For example, deleting a tub appears to require an unusual p4 spaceship.

x = 33, y = 16, rule = B3/S23 23bo$22bobo$23bo4$16b3o$3o13bo2bo$o2bo4b3o5bo11b3o$o7bo2bo4bo3bo7bo2bo $o3bo2bo3bo4bo3bo7bo$o6bobo3bo2bo11bo3bo$bo2b2o8bobo11bo3bo$b5o8bo13bo $4b2o6bo3b3o10bobo$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THEME 6 GRID THUMBSIZE 2 THUMBLAUNCH AUTOSTART GPS 5 LOOP 40 ]]
Fly-by deletion of a tub (click above to open LifeViewer)
RLE: here Plaintext: here

The deletion of a pond appears to require a convoy which is 89 cells in width containing a very unusual p4 spaceship which has 273 cells.[citation needed] There are small objects which have no known fly-by deletion reactions.[citation needed] However, as in the case of reanimation, hitting them with the output of rakes is an effective brute force method.

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