diff --git a/ChangeLog.md b/ChangeLog.md
index 099b93a3..e3d5949c 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,3 +1,12 @@
+#2.2.13
+  * Add 'time to drain' summary value.  This is the time to drain the WEP capacitor if firing all enabled weapons
+  * Do not include utility slot DPS/EPS/HPS in summary information
+  * Ensure that auto loader special shows in the tooltip
+  * Ensure that ship mass is recalculated when appropriate
+  * Use coriolis-data 2.2.13:
+    * Add plasma slug special effect for plasma accelerator
+    * Tweak hull costs of ships
+
 #2.2.12
   * Tidy up old references to coriolis.io
   * Add ability to add and remove special effects to weapon modifications
diff --git a/__tests__/fixtures/anaconda-test-detailed-export-v4.json b/__tests__/fixtures/anaconda-test-detailed-export-v4.json
index 638dfd51..fc1f83ee 100644
--- a/__tests__/fixtures/anaconda-test-detailed-export-v4.json
+++ b/__tests__/fixtures/anaconda-test-detailed-export-v4.json
@@ -269,20 +269,19 @@
     "topSpeed": 187.01,
     "totalCost": 882362058,
     "totalDpe": 142.68,
-    "totalDps": 103.8,
-    "totalEps": 22.71,
-    "totalHps": 677.29,
+    "totalDps": 101.13,
+    "totalEps": 18.71,
     "totalExplDpe": 0,
     "totalExplDps": 0,
     "totalExplSDps": 0,
     "totalAbsDpe": 3.57,
     "totalAbsDps": 18.78,
     "totalAbsSDps": 14.45,
-    "totalHps": 33.62,
+    "totalHps": 28.28,
     "totalKinDpe": 117.48,
-    "totalKinDps": 24.94,
-    "totalKinSDps": 18.76,
-    "totalSDps": 91.84,
+    "totalKinDps": 22.27,
+    "totalKinSDps": 16.91,
+    "totalSDps": 89.99,
     "totalThermDpe": 21.63,
     "totalThermDps": 60.08,
     "totalThermSDps": 58.64,
@@ -320,6 +319,7 @@
     "shieldCells": 1840,
     "shieldExplRes": 0.5,
     "shieldKinRes": 0.4,
-    "shieldThermRes": -0.2
+    "shieldThermRes": -0.2,
+    "timeToDrain": 7.04
   }
 }
diff --git a/package.json b/package.json
index 267e1f16..f4d6bfbb 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "coriolis_shipyard",
-  "version": "2.2.12",
+  "version": "2.2.13",
   "repository": {
     "type": "git",
     "url": "https://github.com/EDCD/coriolis"
diff --git a/src/app/components/DamageDealt.jsx b/src/app/components/DamageDealt.jsx
index 2b88a07c..3fd7e826 100644
--- a/src/app/components/DamageDealt.jsx
+++ b/src/app/components/DamageDealt.jsx
@@ -142,7 +142,7 @@ export default class DamageDealt extends TranslatedComponent {
           let engineering;
           if (m.blueprint && m.blueprint.name) {
             engineering = translate(m.blueprint.name) + ' ' + translate('grade') + ' ' + m.blueprint.grade;
-            if (m.blueprint.special && m.blueprint.special.id) {
+            if (m.blueprint.special && m.blueprint.special.id >= 0) {
               engineering += ', ' + translate(m.blueprint.special.name);
             }
           }
diff --git a/src/app/components/HardpointSlot.jsx b/src/app/components/HardpointSlot.jsx
index 826bc7c2..ce8416a9 100644
--- a/src/app/components/HardpointSlot.jsx
+++ b/src/app/components/HardpointSlot.jsx
@@ -48,7 +48,7 @@ export default class HardpointSlot extends Slot {
       let modTT = translate('modified');
       if (m && m.blueprint && m.blueprint.name) {
         modTT = translate(m.blueprint.name) + ' ' + translate('grade') + ' ' + m.blueprint.grade;
-        if (m.blueprint.special && m.blueprint.special.id) {
+        if (m.blueprint.special && m.blueprint.special.id >= 0) {
           modTT += ', ' + translate(m.blueprint.special.name);
         }
       }
diff --git a/src/app/components/ShipSummaryTable.jsx b/src/app/components/ShipSummaryTable.jsx
index 54c66e87..0c0202fb 100644
--- a/src/app/components/ShipSummaryTable.jsx
+++ b/src/app/components/ShipSummaryTable.jsx
@@ -42,10 +42,11 @@ export default class ShipSummaryTable extends TranslatedComponent {
             <th rowSpan={2} className={ cn({ 'bg-warning-disabled': !ship.canBoost() }) }>{translate('boost')}</th>
             <th onMouseEnter={termtip.bind(null, 'damage per second')} onMouseLeave={hide} rowSpan={2}>{translate('DPS')}</th>
             <th onMouseEnter={termtip.bind(null, 'energy per second')} onMouseLeave={hide} rowSpan={2}>{translate('EPS')}</th>
+            <th onMouseEnter={termtip.bind(null, 'time to drain WEP capacitor')} onMouseLeave={hide} rowSpan={2}>{translate('TTD')}</th>
             <th onMouseEnter={termtip.bind(null, 'heat per second')} onMouseLeave={hide} rowSpan={2}>{translate('HPS')}</th>
-            <th rowSpan={2}>{translate('hardness')}</th>
-            <th rowSpan={2}>{translate('armour')}</th>
-            <th rowSpan={2}>{translate('shields')}</th>
+            <th onMouseEnter={termtip.bind(null, 'hull hardness')} onMouseLeave={hide} rowSpan={2}>{translate('hrd')}</th>
+            <th onMouseEnter={termtip.bind(null, 'armour')} onMouseLeave={hide} rowSpan={2}>{translate('arm')}</th>
+            <th onMouseEnter={termtip.bind(null, 'shields')} onMouseLeave={hide} rowSpan={2}>{translate('shld')}</th>
             <th colSpan={3}>{translate('mass')}</th>
             <th rowSpan={2}>{translate('cargo')}</th>
             <th rowSpan={2}>{translate('fuel')}</th>
@@ -71,6 +72,7 @@ export default class ShipSummaryTable extends TranslatedComponent {
             <td>{ ship.canBoost() ? <span>{int(ship.topBoost)} {u['m/s']}</span> : <span className='warning'>0 <Warning/></span> }</td>
             <td>{f1(ship.totalDps)}</td>
             <td>{f1(ship.totalEps)}</td>
+            <td>{ship.timeToDrain === Infinity ? '∞' : time(ship.timeToDrain)}</td>
             <td>{f1(ship.totalHps)}</td>
             <td>{int(ship.hardness)}</td>
             <td>{int(ship.armour)}</td>
diff --git a/src/app/i18n/en.js b/src/app/i18n/en.js
index 5062f672..86b56bf8 100644
--- a/src/app/i18n/en.js
+++ b/src/app/i18n/en.js
@@ -215,6 +215,8 @@ Along the top of the screen are some of the key values for your build.  This is
 
 Here, along with most places in Coriolis, acronyms will have tooltips explaining what they mean.  Hover over the acronym to obtain more detail, or look in the glossary at the end of this help.</p>
 
+All values are the highest possible, assuming that you have maximum pips in the relevant capacitor (ENG for speed, WEP for time to drain, etc.).</p>
+
 <h2>Modules</h2>
 The next set of panels laid out horizontally across the screen contain the modules you have put in your build.  From left to right these are the core modules, the internal modules, the hardpoints and the utility mounts.  These represent the available slots in your ship and cannot be altered.  Each slot has a class, or size, and in general any module up to a given size can fit in a given slot (exceptions being bulkheads, life support and sensors in core modules and restricted internal slots, which can only take a subset of module depending on their restrictions). </p>
 
diff --git a/src/app/shipyard/Ship.js b/src/app/shipyard/Ship.js
index aa4803bc..705b5bea 100755
--- a/src/app/shipyard/Ship.js
+++ b/src/app/shipyard/Ship.js
@@ -419,6 +419,7 @@ export default class Ship {
     m.mods = {};
     this.updatePowerGenerated()
         .updatePowerUsed()
+        .recalculateMass()
         .updateJumpStats()
         .recalculateShield()
         .recalculateShieldCells()
@@ -426,6 +427,7 @@ export default class Ship {
         .recalculateDps()
         .recalculateEps()
         .recalculateHps()
+        .recalculateTtd()
         .updateMovement();
   }
 
@@ -461,11 +463,8 @@ export default class Ship {
       this.updatePowerUsed();
     } else if (name === 'mass') {
       // Mass
-      let oldMass = m.getMass();
       m.setModValue(name, value, sentfromui);
-      let newMass = m.getMass();
-      this.unladenMass = this.unladenMass - oldMass + newMass;
-      this.ladenMass = this.ladenMass - oldMass + newMass;
+      this.recalculateMass();
       this.updateMovement();
       this.updateJumpStats();
     } else if (name === 'maxfuel') {
@@ -497,11 +496,15 @@ export default class Ship {
       this.recalculateDps();
       this.recalculateHps();
       this.recalculateEps();
+      this.recalculateTtd();
     } else if (name === 'explres' || name === 'kinres' || name === 'thermres') {
       m.setModValue(name, value, sentfromui);
       // Could be for shields or armour
       this.recalculateArmour();
       this.recalculateShield();
+    } else if (name === 'wepcap' || name === 'weprate') {
+      m.setModValue(name, value, sentfromui);
+      this.recalculateTtd();
     } else {
       // Generic
       m.setModValue(name, value, sentfromui);
@@ -627,6 +630,7 @@ export default class Ship {
     if (comps) {
       this.updatePowerGenerated()
           .updatePowerUsed()
+          .recalculateMass()
           .updateJumpStats()
           .recalculateShield()
           .recalculateShieldCells()
@@ -634,6 +638,7 @@ export default class Ship {
           .recalculateDps()
           .recalculateEps()
           .recalculateHps()
+          .recalculateTtd()
           .updateMovement();
     }
 
@@ -815,6 +820,7 @@ export default class Ship {
 
         if (slot.m.getEps()) {
           this.recalculateEps();
+          this.recalculateTtd();
         }
       }
     }
@@ -851,6 +857,7 @@ export default class Ship {
    */
   updateStats(slot, n, old, preventUpdate) {
     let powerGeneratedChange = slot == this.standard[0];
+    let powerDistributorChange = slot == this.standard[4];
     let powerUsedChange = false;
     let dpsChanged = n && n.getDps() || old && old.getDps();
     let epsChanged = n && n.getEps() || old && old.getEps();
@@ -863,15 +870,6 @@ export default class Ship {
     let shieldCellsChange = (n && n.grp === 'scb') || (old && old.grp === 'scb');
 
     if (old) {  // Old modul now being removed
-      switch (old.grp) {
-        case 'ft':
-          this.fuelCapacity -= old.fuel;
-          break;
-        case 'cr':
-          this.cargoCapacity -= old.cargo;
-          break;
-      }
-
       if (slot.incCost && old.cost) {
         this.totalCost -= old.cost * this.moduleCostMultiplier;
       }
@@ -879,20 +877,9 @@ export default class Ship {
       if (old.getPowerUsage() > 0 && slot.enabled) {
         powerUsedChange = true;
       }
-
-      this.unladenMass -= old.getMass() || 0;
     }
 
     if (n) {
-      switch (n.grp) {
-        case 'ft':
-          this.fuelCapacity += n.fuel;
-          break;
-        case 'cr':
-          this.cargoCapacity += n.cargo;
-          break;
-      }
-
       if (slot.incCost && n.cost) {
         this.totalCost += n.cost * this.moduleCostMultiplier;
       }
@@ -900,13 +887,11 @@ export default class Ship {
       if (n.power && slot.enabled) {
         powerUsedChange = true;
       }
-
-      this.unladenMass += n.getMass() || 0;
     }
 
-    this.ladenMass = this.unladenMass + this.cargoCapacity + this.fuelCapacity;
-
     if (!preventUpdate) {
+      // Must recalculate mass first, as movement, jump etc. relies on it
+      this.recalculateMass();
       if (dpsChanged) {
         this.recalculateDps();
       }
@@ -919,6 +904,9 @@ export default class Ship {
       if (powerGeneratedChange) {
         this.updatePowerGenerated();
       }
+      if (powerDistributorChange) {
+        this.recalculateTtd();
+      }
       if (powerUsedChange) {
         this.updatePowerUsed();
       }
@@ -957,7 +945,34 @@ export default class Ship {
   }
 
   /**
-   * Calculate damage per second for weapons
+   * Calculate time to drain WEP capacitor
+   * @return {this} The ship instance (for chaining operations)
+   */
+  recalculateTtd() {
+    let totalSEps = 0;
+
+    for (let slotNum in this.hardpoints) {
+      const slot = this.hardpoints[slotNum];
+      if (slot.m && slot.enabled && slot.type === 'WEP' && slot.m.getDps()) {
+        totalSEps += slot.m.getClip() ? (slot.m.getClip() * slot.m.getEps() / slot.m.getRoF()) / ((slot.m.getClip() / slot.m.getRoF()) + slot.m.getReload()) : slot.m.getEps();
+      }
+    }
+
+    // Calculate the drain time
+    const drainPerSecond = totalSEps - this.standard[4].m.getWeaponsRechargeRate();
+    if (drainPerSecond <= 0) {
+      // Can fire forever
+      this.timeToDrain = Infinity;
+    } else {
+      const initialCharge = this.standard[4].m.getWeaponsCapacity();
+      this.timeToDrain = initialCharge / drainPerSecond;
+    }
+
+    return this;
+  }
+
+  /**
+   * Calculate damage per second and related items for weapons
    * @return {this} The ship instance (for chaining operations)
    */
   recalculateDps() {
@@ -979,7 +994,7 @@ export default class Ship {
 
     for (let slotNum in this.hardpoints) {
       const slot = this.hardpoints[slotNum];
-      if (slot.m && slot.enabled && slot.m.getDps()) {
+      if (slot.m && slot.enabled && slot.type === 'WEP' && slot.m.getDps()) {
         const dpe = slot.m.getEps() === 0 ? 0 : slot.m.getDps() / slot.m.getEps();
         const dps = slot.m.getDps();
         const sdps = slot.m.getClip() ? (slot.m.getClip() * slot.m.getDps() / slot.m.getRoF()) / ((slot.m.getClip() / slot.m.getRoF()) + slot.m.getReload()) : dps;
@@ -1040,7 +1055,7 @@ export default class Ship {
 
     for (let slotNum in this.hardpoints) {
       const slot = this.hardpoints[slotNum];
-      if (slot.m && slot.enabled && slot.m.getHps()) {
+      if (slot.m && slot.enabled && slot.type === 'WEP' && slot.m.getHps()) {
         totalHps += slot.m.getHps();
       }
     }
@@ -1058,7 +1073,7 @@ export default class Ship {
 
     for (let slotNum in this.hardpoints) {
       const slot = this.hardpoints[slotNum];
-      if (slot.m && slot.enabled && slot.m.getEps()) {
+      if (slot.m && slot.enabled && slot.m.getEps() && slot.type === 'WEP') {
         totalEps += slot.m.getEps();
       }
     }
@@ -1130,6 +1145,55 @@ export default class Ship {
     return this;
   }
 
+  /**
+   * Eecalculate mass
+   * @return {this} The ship instance (for chaining operations)
+   */
+  recalculateMass() {
+    let unladenMass = this.hullMass;
+    let cargoCapacity = 0;
+    let fuelCapacity = 0;
+
+    unladenMass += this.bulkheads.m.getMass();
+
+    for (let slotNum in this.standard) {
+      const slot = this.standard[slotNum];
+      if (slot.m) {
+        unladenMass += slot.m.getMass();
+        if (slot.m.grp === 'ft') {
+          fuelCapacity += slot.m.fuel;
+        }
+      }
+    }
+
+    for (let slotNum in this.internal) {
+      const slot = this.internal[slotNum];
+      if (slot.m) {
+        unladenMass += slot.m.getMass();
+        if (slot.m.grp === 'ft') {
+          fuelCapacity += slot.m.fuel;
+        } else if (slot.m.grp === 'cr') {
+          cargoCapacity += slot.m.cargo;
+        }
+      }
+    }
+
+    for (let slotNum in this.hardpoints) {
+      const slot = this.hardpoints[slotNum];
+      if (slot.m) {
+        unladenMass += slot.m.getMass();
+      }
+    }
+
+    // Update global stats
+    this.unladenMass = unladenMass;
+    this.cargoCapacity = cargoCapacity;
+    this.fuelCapacity = fuelCapacity;
+    this.ladenMass = unladenMass + fuelCapacity + cargoCapacity;
+
+    return this;
+  }
+
   /**
    * Update movement values
    * @return {this} The ship instance (for chaining operations)