From 9bfddce3755c1d1fed7adb9f9662d240dec7f70e Mon Sep 17 00:00:00 2001
From: "Jan \"Yenya\" Kasprzak" <kas@fi.muni.cz>
Date: Tue, 12 Mar 2019 11:41:49 +0100
Subject: [PATCH] wing tube support: stronger mid section

---
 wing-tube-support.scad | 66 ++++++++++++++++++++++++++----------------
 1 file changed, 41 insertions(+), 25 deletions(-)

diff --git a/wing-tube-support.scad b/wing-tube-support.scad
index 908a7b2..0c438f7 100644
--- a/wing-tube-support.scad
+++ b/wing-tube-support.scad
@@ -1,10 +1,10 @@
 eps = 0.01;
 infty = 100;
 
-wall = 1.5;
+wall = 1;
 thin_wall = 0.6;
 
-tube_d = 6;
+tube_d = 6 + 0.3;
 tube_zoff = 3;
 
 base_front = 15;
@@ -15,7 +15,7 @@ base_l = 15;
 tube_l = base_l/2;
 base_overhang = 0.9; // factor of base_front, base_r, base_l
 
-module body() {
+module body(tube_zoff) {
 	// base
 	// scale([1, base_l/base_w, 1])
 	// cylinder(r = base_w/2, h = thin_wall);
@@ -52,35 +52,51 @@ module body() {
 	for (x = [-1,1])
 	scale([x, 1, 1]) {
 		translate([tube_d/2, -tube_l/2, 0])
-			cube([thin_wall, tube_l, tube_zoff + tube_d/2]);
+			cube([wall, tube_l, tube_zoff + tube_d/2]);
 	}
 
 	// upper cylinder clip
 	translate([0, -tube_l/2, tube_d/2 + tube_zoff])
 	intersection() {
-		rotate([-90, 0, 0])
-			cylinder(r = tube_d/2 + thin_wall, h = tube_l);
-		translate([-tube_d/2-thin_wall, 0, 0])
-		 	cube([tube_d + 2*thin_wall, tube_l, tube_d]);
+		rotate([-90, 0, 0]) union() {
+			cylinder(r = tube_d/2 + wall, h = tube_l);
+			translate([0, 0, tube_l/2 - wall/2])
+				cylinder(r = tube_d/2 + wall + thin_wall,
+					h = wall);
+		}
+		translate([-tube_d/2-wall, 0, 0])
+		 	cube([tube_d + 2*wall, tube_l, tube_d]);
 	}
 }
 
-difference() {
-	body();
-	// main tube
-	translate([0, -base_l/2-eps, tube_d/2+tube_zoff])
-	rotate([-90, 0, 0])
-		cylinder(r = tube_d/2, h = base_l + 2*eps);
-	// upper clip
-	translate([-infty/2, -infty/2, tube_zoff + 5*tube_d/6])
-		cube(infty);
+module wing_tube_support(tube_zoff) {
+	difference() {
+		body(tube_zoff);
+		// main tube
+		translate([0, -base_l/2-eps, tube_d/2+tube_zoff])
+		rotate([-90, 0, 0])
+			cylinder(r = tube_d/2, h = base_l + 2*eps);
+		// upper clip
+		translate([-infty/2, -infty/2, tube_zoff + 5*tube_d/6])
+			cube(infty);
+
+		// front-side hole
+		translate([0.6*base_front, 0, -eps])
+			scale([1, base_l/base_front, 1])
+			cylinder(r = base_front/4, h = thin_wall + 2*eps);
+		// rear-side hole
+		translate([-0.6*base_rear, 0, -eps])
+			scale([1, base_l/base_rear, 1])
+			cylinder(r = base_rear/4, h = thin_wall + 2*eps);
+	}
+}
 
-	// front-side hole
-	translate([0.6*base_front, 0, -eps])
-		scale([1, base_l/base_front, 1])
-		cylinder(r = base_front/4, h = thin_wall + 2*eps);
-	// rear-side hole
-	translate([-0.6*base_rear, 0, -eps])
-		scale([1, base_l/base_rear, 1])
-		cylinder(r = base_rear/4, h = thin_wall + 2*eps);
+for (q = [-1,1]) {
+	scale([q, 1, 1]) translate([-base_front - 5, 0, 0]) {
+			wing_tube_support(1.7);
+		translate([0, -base_l -5, 0])
+			wing_tube_support(2.8);
+		translate([0, base_l + 5, 0])
+			wing_tube_support(0.6);
+	}
 }
-- 
2.43.0