Well, the nose is too long, and there are other problems with the hull,

but that's a visualisation that works.

model/fourbar.scad

@@ -3,9 +3,9 @@
 // (c) Simon Brooke 2025; CC-BY-SA
 
 
-include <BentSim/Library/Bike_accessories.scad>
 include <NACAAirfoils/files/Naca4.scad>
 include <library/skew.scad>
+include <wheel.scad>
 
 module fourbar_leg(length=1000, chord=100, long_skew=30, lat_skew=30) {
     h = length * cos(lat_skew) * cos( long_skew);
@@ -47,8 +47,8 @@ module fourbar_axle_half( length, chord) {
        
     // wheel
     translate([0, length + 50, -50])
-        // Pierre Rouzeau's wheel is beautifully modelled and parameterised, but it doesn't seem to be scaled as I'd expect...
+        rotate([270, 0, 0])
-        wheel(rim=451, spoke_nbr=32);
+        wheel(iso=451);
 }
 
 

model/hull.scad

@@ -64,4 +64,4 @@ module hull() {
         }
 }
 
-hull();
+//hull();

model/subframe.scad

@@ -2,18 +2,17 @@
 
 // (c) Simon Brooke 2025; CC-BY-SA
 
-
-include <BentSim/Library/Bike_accessories.scad>
 include <SprocketGenerator2/files/Sprocket_Generator_v2_example_10.scad>
 
+include <wheel.scad>
 include <chainset.scad>
 include <epicyclic.scad>
 
 module subframe_cycleparts(rim=451, chainring_teeth=82, crank=140) {
         // wheel
     translate([0, 382, 93])
-        rotate([0, 0, 90])
+        rotate([0, 90, 0])
-        wheel(rim=rim, spoke_nbr=0);
+        wheel(iso=rim);
         
     translate([-42, 382, 93])
         rotate([0, 90, 0])

model/tricycle.scad

@@ -6,15 +6,17 @@
 
 include <subframe.scad>
 include <fourbar.scad>
-//include <hull.scad>
+include <hull.scad>
 
 rotate([0, 0, 270])
 translate([0, 1200, 180])
 subframe(structure="carbon");
-translate([0,-50, 320])
+translate([0, 0, 320])
 fourbar(700, 100, 30, 35, 650);
 
-//hull();
+translate([500, 0, 100])
+rotate([0, 3, 0])
+hull();
 
 /* 
 prop=0.1;

model/wheel.scad

@@ -0,0 +1,61 @@
+// wheel.scad
+
+// I don't actually need spoked wheels
+
+
+// ISO standard numbers refer to the tyre bead diameter in
+// millimetres; the outer diameter of the rim is about 14mm 
+// more. Rim width varies but 22mm is common. The wheel sizes 
+// I'm interested in are ISO 406 and ISO 451. Fronmt hubs (and 
+// the hubs I'm planning to use are all front hubs) typically
+// have an over locknut dimension of 100mm, but the lefties, 
+// which I plan to use, are narrower: 50mm flange to flange, and
+// 65mm overall (with a 5mm spacing to the inner side of the
+// fork leg).
+//
+// Outer diameter over the inflated tyre is obviously larger than
+// the rim diameter but how much larget depends on the tyre; 
+// for road tyres, 20mm seems about typical.
+
+module wheel (iso=451) {
+    radius=(iso/2)+7;
+    
+    // rim
+    color("grey")
+    difference() {
+        cylinder(h=22, r=radius, center=true);
+        translate([0,0, -11])
+            cylinder(h=26, r=(radius-10));
+    }
+    
+    // carbon cones covering the spokes
+    color("black")
+        translate([0,0, 4])
+        cylinder(h=26.6, r1=radius, r2=22.5);
+    color("black")
+            mirror([0, 0, -1])
+        translate([0,0, 4])
+                cylinder(h=14.4, r1=radius, r2=29);   
+    
+    // tyre
+    color("black")
+    rotate_extrude(convexity = 10)
+    translate([radius +10, 0, 0])
+        circle(r = 12, $fn = 100);
+    
+    // hub
+    color("grey")
+    translate([0, 0, -40])
+    cylinder(h=65, r=22.5);
+    
+    // axle 
+    color("silver") {
+        translate([0, 0, -45])
+            cylinder(h=70, r1=12.5, r2=7.5);
+        translate([0, 0, -85])
+            cylinder(h=40, r=12.5);
+    }
+    
+}
+
+// wheel();