Lucifer Cannon

http://tremulous.net/manual/lcannon.jpg
Cost: 600 Stage: 3
The Lucifer Cannon is the human team’s most devastating weapon. It is an energy weapon that can hold up to 90 cells at a time, or 135 with a Battery Pack. By holding down the Primary Attack button, a player may charge up a powerful, slow moving projectile with splash damage. The longer the attack is charged the more powerful the projectile and the more ammo used. If the attack is charged for too long the weapon will explode, damaging the player. The Secondary Attack button ﬁres a smaller projectile that requires no charging. This weapon is good for destroying bases.
Damage = 265*charge/255, Charge = button held (msec) / 20
If charge reaches 255, the cannon fires a shot which immediately explodes, catching the user in its splash damage
Between your charged fire release and the start of your next charge is a 1000msec delay, and you must be charging for at least 1000msec to release a charged shot.
So a series of nearly fully charged shots, each taking 5000msec to fire and incurring a 1000msec repeat time, would have a surprisingly low dps of 43.3.