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A worthless combination x = 39, y = 42, rule = B3/S23
13b2obo$13bo3bo13b3o$13bo4bo12bo$15b2o17bo$9b3o5bobo11bo2bo$9bo10bo11b
o2bo$12bo5bo14bo$9bo2bo6bob2o12bobo$10bo2bo6b4o13b2o$11bo3bo8bo13bo$3b
3o7bo2bo7b2o11b2o$3bo2b3o5bo2bo4b2o3bo8b3o$4bobo9b2o4b2obobo3b2ob2ob2o
$2o7bo6b2o2b2o2b2obo3bo3bob2o ...

Another (less complicated) design to output a Herschell backwards and then apply a repeatable "to glider and back" mechanism: x = 370, y = 70, rule = B3/S23
31bo$29bo3bo$34bo$29bo4bo$30b5o6$138b3o$32b3o102b5o$34bo102b3ob2o$32b
3o105b2o2$33bo$31b3o102b2o$29b3o103b3o$30b2o102b2o2bo$134bob4o$134bo4b
o ...

The engine used at the start was discovered by me - but I bet I only REdiscovered it.
Next, the reaction is perturbed to introduce a stepping block, that causes the next "wave" to turn into a bubble, that is then perturbed by the heavyweight into a usable spark.
It was discovered at about same time ...

Hello.
There are 3 types of wicks (or so it seems):
Front-stabilized (Bell's Beetle)
Rear-stabilized (Faces, part of 114p6h1v0 AKA Face Stacker)
Unstable on both ends (Turtle Poop - Turtle-pulled asymmetric wick, needs a tiny stabilizer at the rear)
Ants, while practically "front-stabilized", could ...

in QuadLife (Golly rule file is named Lifecolor), a Schick alternator can be used to make the period of any Schick-based ships/puffers/rakes rise 3x: x = 178, y = 53, rule = lifecolor
7.5A$6.A4.A$11.A$6.A3.A$8.A2$5.3C66.3A$4.C3.C64.5A$4.2C2.C64.3A.2A$7.
2C67.2A2$5.2C$4.C2.C$4.2C3$75.3A$2.2C14.A56.A2 ...

Though the alternation is hard (or impossible) to do, the reaction can, in fact, be turned into a glider-based puffer (though this puffer may be too big). Alter the phases of glider streams to alter the output. This is the dirtiest variant (cleanest is a block-layer). x = 128, y = 106, rule = B3/S23 ...

What about the asymmetric puffer engine used at the start?

x = 178, y = 53, rule = B3/S23
7b5o$6bo4bo$11bo$6bo3bo$8bo2$5b3o66b3o$4bo3bo64b5o$4b2o2bo64b3ob2o$7b
2o67b2o2$5b2o$4bo2bo$4b2o3$75b3o$2b2o14bo56bo2bo$2b2o13b3o21bo18bobo
10b2o2b2o$2bo13bo2b2o20bobo2bobo10bo2bo9bo5bo$16b2o27bo2bo10bo15b3o$
31b3o9bo4bo23b2o$3b2o9bo16bo2b2o7bo2bo13b3o9bo2b3o14bo ...

Basically,the ship below is made up of 3 intertwined ships, each made up of two Asymmetric Schick ENgine Spark Tracks. I called it Tyrian - after a shoot'em-up game. Rotate it to move up, you'll see why.
x = 177, y = 159, rule = B3/S23
3b6o$2bo5bo3b5o33b2o$8bo2bo4bo30b3ob2o4b5o ...

x = 31, y = 19, rule = B3/S23
17b4o$b6o9b6o$o5bo9b4ob2o$6bo13b2o3bo2bo$o4bo23bo$2b2o21bo3bo$26b4o2$
6b3o10b2ob2o$6bo12b2o5b3o$7bo10bo6b5o$19b2o3b4ob2o$5b2o12bo2bo5b2o$3bo
4bo11bobo$9bo6b2o$3bo5bo4bo4bo$4b6o10bo$14bo5bo$15b6o! - I found this Coe engine forwards rake. Actually, the rear part here ...

The pattern's image and RLE should be changed to this: - since this is the form with smallest bounding box.

Infinite Glider Graveyard is a type of nonfiller that outlines a portion of the grid with gliders. Those are comprised of 4 copies of the same rake, preferably using orthogonal standard ships for the rear or having no puffer part.
I discovered a rake, and made it into a glider graveyard: x = 375, y ...

Please tell me where to upload RLEs for use in LifeWiki - or find the RLE for "backbone" in "Super-hard-to-destroy battleship" and load it to LifeWiki with proper credit and the name, if trhere is one, into "Turtle" article. The "backbone" has wasp-like sides on each segment. In Platypus5's thread ...

That "favorite spark" was actually the BOOM from the Bi-Block Slow Puffer

Interesting little doohickey:
x = 8, y = 9, rule = B3/S23
5bobo$bo3bobo$obo2b3o$2o2$2o$obo2b3o$bo3bobo$5bobo!

It turns into two tables and a pair of "shoes"/"bookends".
Besides, this is the variant of Boss after which I call them "shoes": x = 11, y = 14, rule = B3/S23
5bo$4bobo$4bobo$3b2ob2o ...

x = 96, y = 45, rule = B3/S23
19b5o$18bo4bo$23bo$18bo3bo$13b2o5bo$2b2o5b4ob2o40bo34b4o$o4bo3b6o14b2o
23b2obob2o19bo9bo3bo$6bo3b4o15b2o23b2obo3bo19b2o11bo$o5bo47b2o6bo15b3o
5b2o2bo2bo$b6o49b3o3bo14b3o6b3o$56b2o5bo14b3o5b2o2bo2bo$11b3o21b3o24b
2o17b2o11bo$60bob2o16bo9bo3bo$18bo23bo16bob2o8b2o18b4o ...

x = 57, y = 137, rule = B3/S23
46b2o5b4o$44b2ob2o3bo3bo$44b4o8bo$45b2o5bo2bo3$52b2o$52bobo$54bo$52b3o
5$53b4o$44b2o6bo3bo$35b4o4b4o9bo$34bo3bo4b2ob2o4bo2bo$38bo6b2o$34bo2bo
3$42b2o$42bobo$42bob2o$43b2o$43bo3$44b2o$43b4o$26b2o5bo2bo6b2ob2o$25b
4o8bo7b2o$25b2ob2o3bo3bo$27b2o5b4o4$32b2o$31b2ob2o ...

Been off sor some time... I know a Schick backrake that could've helped but it's not P48. 2 p48 rakes (or a symmetric one) would be needed. If the only options are backwards, Slow Puffer Wing could help. Besides, here's a rake with Slow Puffer Wings turning its gliders (and making them into bi ...

Some inward backrakes in a c/2 battleship could be turned into another frontal ray using slow puffer wings.
BTW how do u reach the effect of the whole glider string apparently going in a straight line rather than diagonally?

It needs reflectors to put out the leaked fuel using the gliders! One part of the thing is apparently a turtle-pulled wick, due to that ship's skeleton-like look I called it "backbone".
x = 50, y = 14, rule = B3/S23
19bo8bo8bo$17b2o8bobo6bobo$b3o7bo5b2o7b2o8bobo7b2obo$b2o2bob2ob2o7bo8b
o7bo8bo3bo ...

Those 3 words describe a type of space-nonfillers that are based on symmetric backrakes.
The smallest P32 backrake can be made out of two Backrake 1's, and so it's the basis of the smallest infinite glider graveyard.
x = 80, y = 80, rule = B3/S23
17b3o11b3o12b3o11b3o$16bo3bo9bo3bo10bo3bo9bo3bo ...

But in plain Marriage only TWO dots follow the couple to form a stable pattern. In its G-variants, it is the spacetakers (dying cells) that provide the boundary stabilization! Just watch a domino evolve in plain and G-variants to see the difference. The boundary piece with all its dying generations ...

X66, 2 generations away from LifeWiki image (with rear domino sparks) can pull David Bell's tagalong (LWSS page).
x = 30, y = 19, rule = B3/S23
26bo$23b4o$18bo2bob2o$18bo$b2obo12bo3bob2o$o2b4o8b2ob2obobob5o$o2bob2o
8b2obobobo2b5o$2o3b2ob2o2b2o2bo3b3o2bob2o$2bo8bo2bob2o$11bo4b2o$2bo8bo
2bob2o ...

Tagalong/pushalong has, in at least one of its stages, a gap between it and the host ship Therefore, boundary pieces (123) are "extensions".
Hm, I see. Personally, I'd retain the term "tagalong" as a term referring to both classes, and place the "extension/not extension" boundary at being ...

Practically, any amount of switch engines, in Noah coupling, can be put in a string ending with "wings" on both sides to form an arbitrarily large cordership
RLE: x = 215, y = 215, rule = B3/S23
185b3o6bo$186b2o3b2obo$185b2o5bobo$190b3obo$193b2o$205b2o$205b2o7$213b
2o$213b2o$195bo3b2o ...