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();