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x = 239, y = 46, rule = B3/S23 62b3o25b3o53b3o25b3o53b3o$61b5o23b5o51b5o23b5o51b5o$60boob3o23b3oboo 49boob3o23b3oboo49boob3o$8boo51boo29boo51boo29boo51boo$5b3oboo$5b5o$6b 3o11$46bo5boo5boo5bo21bo5boo5boo5bo21bo5boo5boo5bo21bo5boo5boo5bo21bo 5boo5boo5bo$44bobbooboobbo3bobbooboobbo17bobbooboobbo3bobbooboobbo17bo bbooboobbo3bobbooboobbo17bobbooboobbo3bobbooboobbo17bobbooboobbo3bobb ooboobbo$4bo5boo5boo5bo17b3o4bobo3bobo3bobo4b3o13b3o4bobo3bobo3bobo4b 3o13b3o4bobo3bobo3bobo4b3o13b3o4bobo3bobo3bobo4b3o13b3o4bobo3bobo3bobo 4b3o$bbobbooboobbo3bobbooboobbo15boobbobb3oboo3boob3obbobboo13boobbobb 3oboo3boob3obbobboo13boobbobb3oboo3boob3obbobboo13boobbobb3oboo3boob3o bbobboo13boobbobb3oboo3boob3obbobboo$3o4bobo3bobo3bobo4b3o13b3obb3o4bo 3bo4b3obb3o13b3obb3o4bo3bo4b3obb3o13b3obb3o4bo3bo4b3obb3o13b3obb3o4bo 3bo4b3obb3o13b3obb3o4bo3bo4b3obb3o$oobbobb3oboo3boob3obbobboo14bobobbo 15bobbobo15bobobbo15bobbobo15bobobbo15bobbobo15bobobbo15bobbobo15bobo bbo15bobbobo$3obb3o4bo3bo4b3obb3o15bo23bo17bo23bo17bo23bo17bo23bo17bo 23bo$bobobbo15bobbobo$bbo23bo15$201bo$200b3o$200boboo$201b3o$201b3o$ 201boo!
I think that the next speed to go will be 2c/7, since the weekender is so small. Weekender predecessors have already been found, which looks promising.
The remaining speeds, which have no known synthesis, are:
* The Caterpillar is actually very easy to construct, but the sheer size of it makes it inordinately tedious. In fact, all of the components of the Caterpillar are constantly removed and re-synthesised, apart from the pi heptominoes that crawl along the tracks. Pies can be synthesised from two gliders, anyway.
Of these speeds, the Caterpillar is the only purely engineered spaceship. Well done to Gabriel Nivasch, Jason Summers and David Bell!
You can read about the Caterpillar here:
http://www.yucs.org/~gnivasch/life/arti ... index.html