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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!

However, there is currently no known way of synthesising the spider in the first place. In fact, the only spaceship speeds that can be synthesised are:

c/2 orthogonal

c/4 diagonal

2c/5 orthogonal

c/12 diagonal

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:

c/3 orthogonal

c/4 orthogonal

c/5 orthogonal

c/6 orthogonal

2c/7 orthogonal

17c/45 orthogonal*

c/5 diagonal

c/6 diagonal

* 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/article_cat/index.html