first commit

2026-07-22 13:48:46 +08:00
commit c87751c3dc
2820 changed files with 726976 additions and 0 deletions
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+// [Engine Configuration]
+// Show 1/4 cutaway to reveal internal components
+cutaway_view = true;
+// Number of front fan blades
+blade_count = 26; // [16:2:36]
+
+// [Colors]
+nacelle_color = "White";
+fan_color = "Silver";
+spinner_color = "DimGray";
+core_cowl_color = "DarkSlateGray";
+strut_color = "LightSlateGray";
+compressor_color = "LightGray";
+combustor_color = "FireBrick";
+turbine_color = "Peru";
+exhaust_color = "SaddleBrown";
+shaft_color = "LightGray";
+
+// Main Execution
+// Orient engine horizontally and center it
+rotate([-90, 0, 0]) 
+translate([0, 0, -155]) {
+    engine_casings();
+    internals();
+}
+
+// === Assemblies ===
+
+module engine_casings() {
+    if (cutaway_view) {
+        difference() {
+            casings();
+            // 90-degree wedge cutout to reveal interior
+            translate([0, 0, -50])
+            cube([200, 200, 500]);
+        }
+    } else {
+        casings();
+    }
+}
+
+module casings() {
+    // Outer Nacelle Cowl
+    color(nacelle_color)
+    rotate_extrude($fn=128) 
+    nacelle_profile();
+
+    // Inner Core Cowl
+    color(core_cowl_color)
+    rotate_extrude($fn=128) 
+    core_cowl_profile();
+
+    // Bypass Struts / Outlet Guide Vanes
+    color(strut_color)
+    translate([0, 0, 70])
+    for(i = [0 : 24]) {
+        rotate([0, 0, i * 360 / 25])
+        translate([36, 0, 0])
+        rotate([0, 90, 0])
+        linear_extrude(height=42, twist=5)
+        rotate([0, 0, 15])
+        scale([1, 0.15])
+        circle(r=8, $fn=16);
+    }
+}
+
+module internals() {
+    // Nose Spinner
+    color(spinner_color)
+    nose_spinner();
+
+    // Front Fan Blades
+    color(fan_color)
+    translate([0, 0, 40])
+    for(i = [0 : blade_count - 1]) {
+        rotate([0, 0, i * 360 / blade_count])
+        translate([23, 0, 0])
+        rotate([-15, 0, 0])
+        fan_blade();
+    }
+
+    // Central Shaft
+    color(shaft_color)
+    rotate_extrude($fn=64)
+    polygon([
+        [0, 40], [24, 40], 
+        [16, 55],          
+        [16, 135],         
+        [16, 240],         
+        [0, 240]
+    ]);
+
+    // Compressor Stages
+    color(compressor_color) {
+        blade_row(65,  36, 15, 33, 10);
+        blade_row(80,  36, 15, 31, 9);
+        blade_row(95,  40, 15, 29, 8);
+        blade_row(110, 40, 15, 27, 7);
+        blade_row(125, 46, 15, 25, 6);
+    }
+
+    // Combustor
+    color(combustor_color)
+    translate([0, 0, 135])
+    rotate_extrude($fn=64)
+    polygon([
+        [16, 0], [21, 5], [21, 10], 
+        [18, 15], 
+        [21, 20], [21, 25], [16, 30]
+    ]);
+
+    // Turbine Stages
+    color(turbine_color) {
+        blade_row(180, 30, 15, 28, 12);
+        blade_row(195, 30, 15, 27.5, 12);
+        blade_row(210, 30, 15, 26.5, 11);
+        blade_row(225, 30, 15, 25.5, 10);
+    }
+
+    // Exhaust Plug Cone
+    color(exhaust_color)
+    translate([0, 0, 240])
+    cylinder(r1=16, r2=2, h=70, $fn=64);
+}
+
+// === Components ===
+
+module nose_spinner() {
+    rotate_extrude($fn=64)
+    intersection() {
+        square([30, 40]);
+        translate([-20, 40]) 
+        circle(r=45, $fn=128);
+    }
+}
+
+module fan_blade() {
+    rotate([0, 90, 0])
+    linear_extrude(height=50, twist=-50, slices=30, scale=0.7)
+    scale([1, 0.12])
+    circle(r=20, $fn=32);
+}
+
+module blade_row(z_pos, count, inner_r, outer_r, chord) {
+    translate([0, 0, z_pos])
+    for(i = [0 : count - 1]) {
+        rotate([0, 0, i * 360 / count])
+        translate([inner_r - 1, 0, 0])
+        rotate([25, 90, 0]) // Pitch angle
+        linear_extrude(height = outer_r - inner_r + 2)
+        scale([1, 0.2])
+        circle(r=chord/2, $fn=16);
+    }
+}
+
+module nacelle_profile() {
+    offset(r=1.5, $fn=16)
+    polygon([
+        [76, 15],   // front intake lip
+        [82, 50],   // thickest outer curve
+        [78, 150],  // rear outer trailing edge
+        [76, 150],  // rear inner
+        [77, 80],   // inner bypass wall
+        [75.5, 40], // fan clearance
+        [74.5, 20]  // front inner transition
+    ]);
+}
+
+module core_cowl_profile() {
+    offset(r=1, $fn=16)
+    polygon([
+        [36, 55],   // front outer (behind fan)
+        [38, 90],   // max thickness
+        [26, 260],  // rear outer tapering nozzle
+        [24, 260],  // rear inner nozzle lip
+        [36, 90],   // inner max
+        [34, 55]    // front inner (compressor intake)
+    ]);
+}