How do I make a bomb and a release system?

[pf12351]

Hey guys, I am enjoying KSP very much but I am stressing out on how to make a bomb system. How does Scott Manley make the bomb at 9:37? Also, how do I make a button open the cargo bay, and how do I make the bomb drop?

Thank you, pf12351.

[Axelord FTW]

In short, action groups.

In the vehicle assembly building (or the spaceplane hangar) there is a button near the top (left of the name section) that lets you set up action groups.

Then, as Scott points out, each of the bombs have a small control surface angled downward so that when released, the payload immediately pitch down (and away) from the craft. The bombs themselves are just five small Oscar-B Fuel Tanks attached to TR-2V Stack Decoupler which are attached to the ship proper via a small Cubic Octagonal Truss (can be surface attached). The decouplers are also activated by action groups (or by stagging).

When in the action group screen in the VAB/SPH, click on a part you want to use and set it up to one of the custom action group (1 to 10). While flying that craft, pressing any of the 1 to 10 keys on your keyboard will activate the corresponding action group you set up while building the craft.

Edited October 9, 2014 by Axelord FTW
I can't count worth s-