bar_length = 26;
bar_height = 0.5;
bar_width = 1;

n = 10;
resolution = 40;
prop_height = 3;

cage_count = 5; //must divide into n


prop_thickness = 0.2;
or = bar_width/2;
ir = or - prop_thickness;
thresh = 0.04;

//assert(n % cage_interval == 0);

//make the basic chassis
module create_bar(rotation){
    
    intersection(){
    //the bars on which the rotors will be mounted
        rotate([0, 90, rotation]) {
            cylinder(r=bar_height, h=bar_length, center=true, $fn = resolution);
        }
     
        translate([0, 0, -bar_width/2.0]){
            rotate([0, 0, rotation]) {
                cube([bar_length,bar_width,bar_height],center=true);
            }
    }
    
    
    
    
    }
    
    
}

module create_circle(rotation){
    rotate([90, 0, rotation])
    rotate_extrude(convexity = 10, $fn = resolution)
    translate([bar_length/2, 0, 0])
    circle(r = bar_height/4, $fn = resolution);
}

module create_prop_holder(rotation){
    rotate([0, 0, rotation])
    translate([bar_length / 3, 0, bar_height / 2.0])
    union(){
    cylinder(h=prop_height/3, r=or, center=true, $fn = resolution);
    translate([0, 0, prop_height / 3]) cylinder(h=prop_height/3, r=ir, center=true, $fn = resolution);
    translate([0, 0, prop_height * 2 / 3]) cylinder(h=prop_height/3, r=or, center=true, $fn = resolution);    
    }
    
    
}

module set_props(rotation){
    rotate([0, 0, rotation])
    translate([bar_length / 3, 0, bar_height / 2.0])
    translate([0, 0, prop_height / 3])
    union(){
        difference(){
        scale([0.1, 0.1, 0.1]) import("C:\\Prop.stl", convexity=5);
        cylinder(h=prop_height/3, r=or, center=true, $fn = resolution);   
        }
        difference(){
            cylinder(h=prop_height/3 - thresh*2, r=or, center=true, $fn = resolution); 
            cylinder(h=prop_height/3 - thresh*2, r=ir + thresh, center=true, $fn = resolution); 
            
        }
    }
    
    
}

module assemble(){
//make the outer cage
    union(){
         for ( i = [0 : n] )
        {
            rotation = 360 * i / n;
            create_bar(rotation);
            
        }


        for (i = [0 : cage_count]){
            rotation = 360 * i / cage_count;
            create_circle(rotation);
            
        }
        
        for (i = [0 : n]){
            rotation = 360 * i / n;
            create_prop_holder(rotation);
            
        }
        
        for (i = [0 : n]){
            rotation = 360 * i / n;
            set_props(rotation);
            
        }

    }
}



assemble();