Starcraft – Do spine crawlers *in* the mineral line affect the rate of resource gathering

starcraft-2

I sometimes like to put spine crawlers in between the minerals and the hive when I am really sick of harassment. How much does this affect the rate of mineral collection? I reckon there must be some impact, since nobody seems to do it.

Best Answer

It depends on where the spine crawler is placed. See in this picture:

-mineral line

If you place a spine crawler at the X position, it might force drones to take a slightly less direct route to the minerals, if at all. The mining rate of the affected drones will decrease by a near-zero amount, pretty much negligible.

However, if a spine is placed directly in the way of the shortest path, such as at the O position, the rate will be affected noticeably. The drone will have to move around the spine in a crescent shape (as shown). This will increase travel time by a fraction of a second, which doesn't seem like much, but can add up.

Here are some rough calculations:

Accourding to liquipedia, the 1st and 2nd drones assigned to a mineral patch collect 40/minerals per minute. Drones collect 5 minerals per trip, which means a drone will make 8 trips back and forth every minute, each trip lasting 7.5 seconds.

If a spine crawler is placed in the direct path of a drone, I'm estimating it adds ~1/8th of a second to the travel time of each trip. Let's say it would normally take 20 minutes to mine out an entire base. The affect that a 1 spine in a direct path will have is:

  • Increase time to 7.625 per trip
  • Increase time to 61 seconds for 8 trips
  • Over the course of the 20 minutes it takes to mine out the base, the affected drones will have to take 2.67 additional trips.

This may not seem like much, but if you have 2 or 3 spines and a fully saturated base, the opportunity cost would be fairly sizable.

So the lesson here is, don't place spines in the direct paths. Place them behind the mineral line or on the outskirts of mining paths.

Related Topic