Well if its 1% rn and you can kill 10 enemies per minute, statistically you would get 0.1 engrams per minute or 1 engrams per per 10 minutes If the amount of enemeies grows to 20 enemies per minute, you would get 0.2 engram per minute or 1 engram per 5 minutes. Understood?

Right now there is not many orange and yellow bar spawning. Bungie plans to increase the ads.

The RNG for engram drops is based on how many enemies are killed and also of what type of enemy, much like Special and Heavy bricks. Killing a red bar will only give a small increase to the counter where a yellow bar will give a large increase. Once it reaches whatever internal number that is, it should drop an engram. In addition, if you have the Prime engram buff it also has a chance to drop from bosses and mini-bosses so it is important to kill those. I had a lot of luck during the mini-event where "the enemy moves against each other" as lots of orange bars and 4 yellow bars spawn near the end of it.

Is this some sort joke or a serious question?