Prototype parts of a disposable model rocket.

[things.git] / disposable-rocket-fins.scad

diff --git a/disposable-rocket-fins.scad b/disposable-rocket-fins.scad
new file mode 100644 (file)
index 0000000..758f719
--- /dev/null
+++ b/disposable-rocket-fins.scad
@@ -0,0 +1,50 @@
+eps = 0.01;
+infty = 1000;
+
+motor_diam = 18;
+wall = 1.5;
+
+cyl_h = 30;
+clip_angle = 40;
+
+module fin() {
+       assign(h1 = cyl_h, h2 = 20, h_off = 50, w = 30, fin_w = 1.0)
+       translate([0, -fin_w/2, 0])
+       hull() { 
+               cube([eps, fin_w, h1]);
+               translate([w, 0, h_off])
+                       cube([eps, fin_w, h2]);
+       };
+};
+
+module body() {
+       difference() {
+               cylinder(r = motor_diam/2 + wall, h = cyl_h);
+               translate([0, 0, -infty/2])
+                       cylinder(r = motor_diam/2, h = infty);
+               for (a = [-clip_angle/2, clip_angle/2])
+                       rotate([0, 0, a])
+                       translate([0, -wall/2, cyl_h/2])
+                               cube([infty, wall, infty]);
+       };
+
+       for (a = [60, 180, 300]) {
+               rotate([0, 0, a])
+               translate([motor_diam/2 + wall/2, 0, 0])
+                       fin();
+       };
+
+       translate([motor_diam/2 + wall + 3, 0, 0])
+               difference() {
+                       union() {
+                               cylinder(r = 3 + wall, h = 5);
+                               translate([-3 -wall, -3 -wall, 0])
+                                       cube([3 + wall, 6 + 2*wall, 5]);
+                       };
+                       translate([0, 0, -infty/2])
+                               cylinder(r = 3, h = infty);
+               };
+};
+
+body();
+