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[SmileyMan]

There's a bit in today's devlog about getting rollers to speed up carts more, and getting ramps to work better, so we may need to scrap all this ‼SCIENCE‼ anyway...

[Psieye]

No, it just means refining the !!SCIENCE!! - the principle of railguns and shotguns are the same, just easier to achieve in the next version.

[Sus]

I haven't got a shotgun working yet due to shoddy building practices, but assuming the GIH railcannon design works, what do we do for ammo?

Spears seems the obvious choice, but what about picks? And while the sharp stuff has obvious appeal, has anyone shotgunned a cart full of silver maces?

For that matter, how about stones? or crafts? or fluffy wamblers?

For maximum ‼Fun‼, I think a bunch of  ‼lignite blocks‼ would be the way to go. Sure, it will probably lead to more ...collateral damage, but who cares about that stuff anyway?
The logistics of getting them in the cart in the first place may be a challenge though.

Or maybe just fill to capacity with cinnabar?

Holy hell. A kea just took one of my stopped minecarts RIGHT OFF THE TRACKS.

What.

"Look, it's just a question of weight ratios!"

[Burmalay]

The minecart was reach tile of track which is located under the bridge in the moment when bridge has being lowered & it doesn't being smashed by the bridge =/ Atomic Smasher is doesn't work with minecarts?

STOP! My bad. In the second try it smashed the minecart.

Better to build retracted bridge. It appears on track & doesn't smash minecart (does it? =)).

[Gigaz]

I guess in my next fort I'll definitely embark with a doctor. I have no idea how the dwarfs manage to ride a heavy cart of flat ground faster than their friends can dogde away...

[Sadrice]

I've done a bit of science, which will probably have to be redone with the upcoming rollers tweak.


I built a track to test how far a cart goes when pushed by a dwarf, and when rollers are added:

Spoiler (click to show/hide)

This is with 20 rollers, showing the cart's final position at 444 tiles traveled.

DATA:

Spoiler (click to show/hide)

Dwarf push (no rollers) : 123 tiles     A cart pushed by a dwarf always goes 123 tiles, whether empty, full of rocks, or with a SPEED:1 dwarf.
Dwarf push and 1 roller (highest speed) : 166 tiles
Dwarf push and 2 rollers (highest speed) :  226 tiles
Dwarf push and 3 rollers (highest speed) :   238 tiles
Dwarf push and 4 rollers (highest speed) :   257 tiles
Dwarf push and 5 rollers (highest speed) :   270 tiles
Dwarf push and 10 rollers (highest speed) :  430 tiles
Dwarf push and 20 rollers (highest speed) :   444 tiles


Dwarf push and 1 roller (lowest speed) :   123 tiles
Dwarf push and 5 rollers (lowest speed) :   123 tiles


Dwarf push and 1 roller (low speed) :   155 tiles
Dwarf push and 5 rollers (low speed) :   155 tiles



Dwarf push and 1 roller (medium speed) :   166 tiles
Dwarf push and 5 rollers (medium speed) :   218 tiles


Dwarf push and 1 roller (high speed) :   166 tiles
Dwarf push and 5 rollers (high speed) :   276 tiles

It seems weight and dwarf speed make no difference in travel distance.  It tried vanilla, SPEED:1, empty, and loaded with rocks.  No observable difference when pushed.  Rollers seem to work weirdly.  Adding 1 highest speed roller adds 43 tiles traveled, adding another adds 60, another adds 12, another adds 19, another adds 33.
 
 

[dhoovr]

I've done a bit of science, which will probably have to be redone with the upcoming rollers tweak.


I built a track to test how far a cart goes when pushed by a dwarf, and when rollers are added:

Spoiler (click to show/hide)

This is with 20 rollers, showing the cart's final position at 444 tiles traveled.

DATA:

Spoiler (click to show/hide)

Dwarf push (no rollers) : 123 tiles     A cart pushed by a dwarf always goes 123 tiles, whether empty, full of rocks, or with a SPEED:1 dwarf.
Dwarf push and 1 roller (highest speed) : 166 tiles
Dwarf push and 2 rollers (highest speed) :  226 tiles
Dwarf push and 3 rollers (highest speed) :   238 tiles
Dwarf push and 4 rollers (highest speed) :   257 tiles
Dwarf push and 5 rollers (highest speed) :   270 tiles
Dwarf push and 10 rollers (highest speed) :  430 tiles
Dwarf push and 20 rollers (highest speed) :   444 tiles


Dwarf push and 1 roller (lowest speed) :   123 tiles
Dwarf push and 5 rollers (lowest speed) :   123 tiles


Dwarf push and 1 roller (low speed) :   155 tiles
Dwarf push and 5 rollers (low speed) :   155 tiles



Dwarf push and 1 roller (medium speed) :   166 tiles
Dwarf push and 5 rollers (medium speed) :   218 tiles


Dwarf push and 1 roller (high speed) :   166 tiles
Dwarf push and 5 rollers (high speed) :   276 tiles

It seems weight and dwarf speed make no difference in travel distance.  It tried vanilla, SPEED:1, empty, and loaded with rocks.  No observable difference when pushed.  Rollers seem to work weirdly.  Adding 1 highest speed roller adds 43 tiles traveled, adding another adds 60, another adds 12, another adds 19, another adds 33.

You should also consider that turns slow down the carts.
An interesting (not that this isn't) test would be the velocity added to the cart by the dwarf and the deceleration caused by turns and track friction via kinematics (∆X = VoT + (1/2)A(T^2) or (V^2) = (Vo^2) + 2A∆X) so we can plan the tracks accordingly before building.

[Sadrice]

I thought of that, but couldn't be bothered to set up the alternate trackway (very long track with no turns) to figure out the details. 
Something else I didn't specifically test for but noticed:  different dwarves (with different strengths, I assume) push the cart the same distance.
Another odd thing I noticed is that vanilla dwarves and speed:1 dwarves seem to drag boulders and laden minecarts at about the same speed.

[Burmalay]

I dropped minecart in shaft from 40+ z-level high on the ramp & minecart doesn't continue its movement it's just stuck on ramp tile  =/

[Uristocrat]

I dropped minecart in shaft from 40+ z-level high on the ramp & minecart doesn't continue its movement it's just stuck on ramp tile  =/

Try putting a roller at the bottom of the drop?

[Burmalay]

I dropped minecart in shaft from 40+ z-level high on the ramp & minecart doesn't continue its movement it's just stuck on ramp tile  =/

Try putting a roller at the bottom of the drop?

Yes. The roller are pushed minecart in the right direction but I  block minecart way with fortification to overturn it to drop its content (to make shotgun) but it doesn't works =(
Fall speed & roller push are not summarized i think. Minecart are just stops after fall & speeds up with roller.

[Gigaz]

I guess in my next fort I'll definitely embark with a doctor. I have no idea how the dwarfs manage to ride a heavy cart of flat ground faster than their friends can dogde away...

I found out why my dwarfs are so uncareful...

They respect the automatic traffic restrictions on built and carved tracks. They however don't care about the bridges which form my outside tracks 

[TinyPirate]

!!SCIENCE!! A four-ramp drop and then 20 rollers WILL shotgun bolts through a fortification. I could see lining an entrance hallway with fortifications and carts filled with bolts. Excessively complex, but it would be funny, I guess.

[TinyPirate]

Here's a picture of the !!SCIENCE!! in action vs. a pasture of puppies and a baby llama.

[TinyPirate]

Addendum: Should a dwarf ride the cart the dwarf and the bolts all get jammed up in the fortifications. He was hit by the cart and then almost every crossbow bolt!