1-Cell Thick Patterns (3)
These are the smallest (in terms of bits) one cell thick patterns to emit a glider, lightweight (LWSS), middleweight (MWSS) and heavyweight (HWSS) spaceship.
Glider
There are two 15-bit patterns.
Pattern #1 (13 cells alive)
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Pattern #1 (RLE)
#CXRLE Pos=0,0 x = 15, y = 1, rule = B3/S23 5ob5ob3o!
Pattern #2 (12 cells alive)
Pattern #2 (RLE)
#CXRLE Pos=0,0 x = 15, y = 1, rule = B3/S23 5ob3o2b4o!
Please refer to 1-Cell Thick Patterns (2) for more information about this patterns.
Lightweight Spaceship
There is one 23-bit pattern.
Pattern #1 (17 cells alive)
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Pattern #1 (RLE)
#CXRLE Pos=0,0 x = 23, y = 1, rule = B3/S23 4ob3ob5o4b5o!
It runs for 202 generations and produces the following:

Including the two LWSS.
Middleweight Spaceship
There are four 30-bit patterns.
Pattern #1 (22 cells alive)
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Pattern #1 (RLE)
#CXRLE Pos=0,0 x = 30, y = 1, rule = B3/S23 3o2b3o3b3o3b13o!
It runs for 789 generations and produces the following:

Including the two MWSS (and two gliders).
Pattern #2 #4 (21 and 22 cells alive, respectively)
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Pattern #2 (RLE)
#CXRLE Pos=0,0 x = 30, y = 1, rule = B3/S23 4o2b6o2b3o4b3ob5o!
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Pattern #4 (RLE)
#CXRLE Pos=0,0 x = 30, y = 1, rule = B3/S23 4ob6o3b4o3b3ob5o!
Both run for 215 generations and produce the following:

Including the two MWSS.
Pattern #3 (26 cells alive)
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Pattern #3 (RLE)
#CXRLE Pos=0,0 x = 30, y = 1, rule = B3/S23 4ob3ob9ob5ob5o!
It runs for 416 generations and produces the following:

Including the two MWSS (and two gliders).
Heavyweight Spaceship
There is one 30-bit pattern.
Pattern #1 (26 cells alive)
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Pattern #3 (RLE) #CXRLE Pos=0,0 x = 30, y = 1, rule = B3/S23 9o2b3ob5ob9o!
It runs for 914 generations and produces the following:

Including the two HWSS.