diff --git a/fio.go b/fio.go
index d65211b..2bdcc21 100644
--- a/fio.go
+++ b/fio.go
@@ -280,9 +280,11 @@ type ElastoDyn struct {
 
 type HydroDyn struct {
 	FileBase
-	WaveMod  Integer `json:"WaveMod"`
-	ExctnMod Integer `json:"ExctnMod"`
-	PotFile  Path    `json:"PotFile" ftype:"Misc"`
+	WaveMod   Integer `json:"WaveMod"`
+	WvDiffQTF Bool    `json:"WvDiffQTF"`
+	WvSumQTF  Bool    `json:"WvSumQTF"`
+	ExctnMod  Integer `json:"ExctnMod"`
+	PotFile   Path    `json:"PotFile" ftype:"Misc"`
 }
 
 func (h *HydroDyn) PostParse() error {
diff --git a/frontend/src/components/Model.vue b/frontend/src/components/Model.vue
index 319e2ec..ef9c4d8 100644
--- a/frontend/src/components/Model.vue
+++ b/frontend/src/components/Model.vue
@@ -58,6 +58,14 @@ function setDefaults() {
         files.AeroDyn[0].SkewMod.Value = 0
     }
 
+    // Set HydroDyn file linearization defaults
+    if (files.HydroDyn.length > 0) {
+        files.HydroDyn[0].WaveMod.Value = 0
+        files.HydroDyn[0].WvDiffQTF.Value = false
+        files.HydroDyn[0].WvSumQTF.Value = false
+        files.HydroDyn[0].ExctnMod.Value = 0
+    }
+
     // Save changes to model
     project.updateModel()
 }
diff --git a/frontend/wailsjs/go/models.ts b/frontend/wailsjs/go/models.ts
index 38d1e93..ff4e8ce 100755
--- a/frontend/wailsjs/go/models.ts
+++ b/frontend/wailsjs/go/models.ts
@@ -982,6 +982,10 @@ export namespace main {
 	    Name: string;
 	    Type: string;
 	    Lines: string[];
+	    WaveMod: Integer;
+	    WvDiffQTF: Bool;
+	    WvSumQTF: Bool;
+	    ExctnMod: Integer;
 	    PotFile: Path;
 	
 	    static createFrom(source: any = {}) {
@@ -993,6 +997,10 @@ export namespace main {
 	        this.Name = source["Name"];
 	        this.Type = source["Type"];
 	        this.Lines = source["Lines"];
+	        this.WaveMod = this.convertValues(source["WaveMod"], Integer);
+	        this.WvDiffQTF = this.convertValues(source["WvDiffQTF"], Bool);
+	        this.WvSumQTF = this.convertValues(source["WvSumQTF"], Bool);
+	        this.ExctnMod = this.convertValues(source["ExctnMod"], Integer);
 	        this.PotFile = this.convertValues(source["PotFile"], Path);
 	    }
 	
@@ -1014,6 +1022,44 @@ export namespace main {
 		    return a;
 		}
 	}
+	export class SubDyn {
+	    Name: string;
+	    Type: string;
+	    Lines: string[];
+	    CBMod: Bool;
+	    Nmodes: Integer;
+	
+	    static createFrom(source: any = {}) {
+	        return new SubDyn(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.Name = source["Name"];
+	        this.Type = source["Type"];
+	        this.Lines = source["Lines"];
+	        this.CBMod = this.convertValues(source["CBMod"], Bool);
+	        this.Nmodes = this.convertValues(source["Nmodes"], Integer);
+	    }
+	
+		convertValues(a: any, classs: any, asMap: boolean = false): any {
+		    if (!a) {
+		        return a;
+		    }
+		    if (a.slice && a.map) {
+		        return (a as any[]).map(elem => this.convertValues(elem, classs));
+		    } else if ("object" === typeof a) {
+		        if (asMap) {
+		            for (const key of Object.keys(a)) {
+		                a[key] = new classs(a[key]);
+		            }
+		            return a;
+		        }
+		        return new classs(a);
+		    }
+		    return a;
+		}
+	}
 	export class Reals {
 	    Name: string;
 	    Type: string;
@@ -1176,6 +1222,7 @@ export namespace main {
 	    Main: Main[];
 	    ElastoDyn: ElastoDyn[];
 	    BeamDyn: BeamDyn[];
+	    SubDyn: SubDyn[];
 	    AeroDyn: AeroDyn[];
 	    AeroDyn14: AeroDyn14[];
 	    HydroDyn: HydroDyn[];
@@ -1195,6 +1242,7 @@ export namespace main {
 	        this.Main = this.convertValues(source["Main"], Main);
 	        this.ElastoDyn = this.convertValues(source["ElastoDyn"], ElastoDyn);
 	        this.BeamDyn = this.convertValues(source["BeamDyn"], BeamDyn);
+	        this.SubDyn = this.convertValues(source["SubDyn"], SubDyn);
 	        this.AeroDyn = this.convertValues(source["AeroDyn"], AeroDyn);
 	        this.AeroDyn14 = this.convertValues(source["AeroDyn14"], AeroDyn14);
 	        this.HydroDyn = this.convertValues(source["HydroDyn"], HydroDyn);
@@ -1417,6 +1465,7 @@ export namespace main {
 	
 	
 	
+	
 
 }