What are they changing about the Tengu?

20% nerf to HML damage might have an impact on Tengu DPS.

Why are they nerfing heavy missile damage? They already do less damage than medium guns.

The makers of Ben and Jerry Ice Cream became aware that their Chunky Monkey brand of Ice Cream was outselling all their other flavours. It seemed everybody wanted to eat Chunky Monkey because it was so delicious. But Ben and Jerry wanted their other brands to be just as good as Chunky Monkey so that everybody could enjoy them. So Ben and Jerry went and took a **** in their next batch of Chunky Monkey. When asked why would they do this, they answered:

"It was just so much easier to make Chunky Monkey taste like **** than to make the other flavours taste better."

CCP went to the Ben and Jerry School of Product Design

Because CCP decided that instead of just nerfing the Drake or the Tengu, they would nerf the entire weapon system they rely upon as well as every other ship that uses or used HMLs. To quote a wise man:

Here are some raw numbers useful for understanding the proposed HML, beam laser and artillery changes:

250mm Railgun II with Spike:
DPS: 20
Alpha: 92
Optimal: 65 km
Falloff: 15 km
Cap/sec: -1.1
PG: 187.2
CPU: 31.5

Heavy Beam Laser II with Aurora:
DPS: 21
Alpha: 91
Optimal: 54 km
Falloff: 10 km
Cap/sec: -3.8
PG: 223.2 (previously 248.5)
CPU: 27.8

720mm Artillery II with Tremor:
DPS: 17
Alpha: 242
Optimal: 54 km
Falloff: 22 km
Cap/sec: 0
PG: 223.2 (previously 248.5)
CPU: 24

Heavy Missile Launcher II with Caldari Navy Scourge:
DPS: 23 (previously 29)
Alpha: 189 (previously 237)
Range: 63 km (previously 84)
Cap/sec: 0
PG: 94.5
CPU: 41.3

This is without any ship bonuses. My view on this is that a 25% range and a 20% dps nerf only seem ridiculous if one ignores just how much better HMLs were than other weapon systems.

Also let's ignore flight time and wrecking shots.

Isn't flight time being reduced? Also, how much do wrecking shots affect long term DPS?

Comparing T2 to faction performance seems off somehow, but the I'm not sure what faction ammo variant would best be used to base comparisons on. Unless we are talking purely max projection.

Also let's ignore flight time and wrecking shots.