There are couple of reasons "why" this is the way it is.
BT weapons dont really generate Heat when fired. They require a bit of Electricity, which is produced by the Fusion Engine. The high amount of power needed also increases the Heat of the Fusion Engine, that is why the Pilot feels Heat in the Cockpit when he fires arm weapons.
In BattleTech, you could argue that the Launcher itself requires enough electricity to generate 2 heat when fired. This could be because weapons are not mounted on the frame, they are mounted and moves with Myomer muscles that need Electricity (this is confirmed in the old sourcebooks - and also the reason why the AC20 generated so much more heat then all other ballistics). Of course part of the Heat is still the projectile.
In case of SRMs, i chose to use 2 Heat per missile and 2 for a launcher, resulting in 6 for the SRM2, and 10 for the SRM4. The SRM6 is 14, so its a logical increase. The same is true for LRMs, but the increase is by 4 instead of 5. I chose this because it was easier to fix 2 values instead of 4. The base line is good enough, and you still have the massive inconsistencies with LRM10 and 20 weight compared to 5 and 15 launchers. And i will not touch weight of weapons, that invites a lot of problems.
BT weapons dont really generate Heat when fired. They require a bit of Electricity, which is produced by the Fusion Engine. The high amount of power needed also increases the Heat of the Fusion Engine, that is why the Pilot feels Heat in the Cockpit when he fires arm weapons.
In BattleTech, you could argue that the Launcher itself requires enough electricity to generate 2 heat when fired. This could be because weapons are not mounted on the frame, they are mounted and moves with Myomer muscles that need Electricity (this is confirmed in the old sourcebooks - and also the reason why the AC20 generated so much more heat then all other ballistics). Of course part of the Heat is still the projectile.
In case of SRMs, i chose to use 2 Heat per missile and 2 for a launcher, resulting in 6 for the SRM2, and 10 for the SRM4. The SRM6 is 14, so its a logical increase. The same is true for LRMs, but the increase is by 4 instead of 5. I chose this because it was easier to fix 2 values instead of 4. The base line is good enough, and you still have the massive inconsistencies with LRM10 and 20 weight compared to 5 and 15 launchers. And i will not touch weight of weapons, that invites a lot of problems.
