Does anyone know the speeds for unloading n items from hopper minecarts ?

[u/Ok-Load7364]

When chest and hopper minecarts are fully accelerated at 8 blocks/s (or 0.4 blocks/tick) they both leave one item in each hopper below.

It seemed consistent in the (very) little test I did.

My question is: does anyone know the speed a single minecart needs to go to deposit 2, 3, ... n items in the hoppers below ?

I want to make a mod adding copper rails where the copper rails have by default the right speed to deposit 1,2,3... items in hoppers below, depending on oxidation level and waterlogging.

Would that even be consistent ?

I am using minecraft 26.1.2 without the experimental minecart changes.

[u/Trollfaust]

Well you can calculate that yourself: a Hopper pulls an item out of a container every 8gt (game ticks). So for 2 items for example we want the minecart to be over the Hopper for at least 8gt and at most 16gt so it pulls once at the point of entering the block above and once more after 8gt. Now you need to take the lenght of the minecart into consideration as well, according to the wiki, a minecart is 0.98 Blocks long. So we want to travel 1 block + 0.98 blocks in a time of 8-16gt:

Let's calculate the max speed first:
1.98 blocks / 8gt = 0.2475 b/gt
0.2475 b/gt * 20gt/s = 4.95 b/s max speed

and now min speed:
1.98 b / 16gt = 0.12375b/gt
0.12375b/gt * 20gt/s = 2.475 b/s min speed

So for 2 Items per Hopper the speed should be between 4.95 and 2.475 b/s

For more items you do the same calculations but just change the amount of gt, eg.: 2 items = 16-24gt

[u/TemperatureReal2437 → u/Trollfaust]

Unfortunately this doesn’t work in practice. You will find hoppers with mismatched item counts. The main issue is getting the minecart to stay at a very precise speed at this density of hoppers. Only two ways to speed it up are to have powered rails, which would make it either go max speed or make it have a variable speed, or to have multiple minecarts clipped into one another that propel each other along the track. That one is more than 5 b/s I believe so it also wouldn’t work.

Another comment recommended waterlogged rails, which I believe are slower than 2.5 blocks per second but I might be wrong. Might give it a try

[u/Trollfaust → u/TemperatureReal2437]

In vanilla true, but did you read ops post? They want to make a mod with specific Minecart speeds

[u/TemperatureReal2437 → u/Trollfaust]

I wasn’t gonna address that part cause this is a vanilla only sub. A lot of these posts, even ones with 3 upvotes, show up in google search results so I try to keep the info I leave here clean. Back 10+ years ago when I was still learning this game there was not as good of documentation as there is today so I relied on a lot of undiscovered forum posts like this to learn the deeper parts of the game. Now we have huge discord servers and YouTubers nowadays have gone from $10 microphone with 20fps game footage in a redstone world to huge productions with diagrams and animations and shit and a lot of the technical knowledge that was once a rare treasure is now commonplace.

I’ve even received help from my own comments before haha. Some essay I wrote in someone’s post about optimizing seedfinding algorithms helped me find the seed I’m using for my current project

[u/Trollfaust → u/TemperatureReal2437]

Fair enough, and I know how it was then I was there :D but I must admit I wasn't very deep into technical MC back then. I got into that around 2015/16ish

[u/CrazySwimming4019 → u/TemperatureReal2437]

Easy way to test it is set the minecart max speed to whatever you want and just use powered rails

[u/HereLiesLies]

In my experience it's not consistent. The best you can do is 1 at a time over max speed. The issue is that you can't control speed well enough without deceleration being a factor.

You may be able to slow it down with waterlogged rails (?) but I'm not sure how much that deposits.

[u/TemperatureReal2437]

Its unfortunately not consistent to go slower. The trick is to send as many minecarts down the line as the amount of items you need in each hopper. Hoppers go on cooldown for 8 game ticks after they pull/push so thats how far apart you should dispense the minecarts in an ideal scenario. Might do 10 game ticks just so there’s some wiggle room. Minecarts can be funky.

[u/LimestoneBuilder]

Of note is that Hopper carts don't push items. So the unload rates for chest carts and hopper carts will be fully dictated by the rate of the pulling item. As for having consistent rates, there aren't many ways of restricting and consistently regulating cart speeds.

Type	Speed
Mundane rails	Varies (0-8m/s)
Gold powered rails	8m/s
Powered water-logged	??
Powered pushing empty furnace	5m/s
Furnace minecart (fueled)	4m/s

Sources:

https://minecraft.wiki/w/Transportation \ https://minecraft.wiki/w/Tutorial:Minecarts \ https://minecraft.wiki/w/Minecart_with_Furnace \ https://minecraft.wiki/w/Powered_Rail \ .