Blade B450 Cargo Hook

thingiverse

Build a cargo hook for your Blade B450 X or 3D helicopter with these easy steps. This tutorial also works for other helicopter classes and types, though adaptions may be needed. Watch this YouTube video to get a visual understanding: [http://www.youtube.com/watch?v=WkS0qComzhA](http://www.youtube.com/watch?v=WkS0qComzhA). Materials required: - 3D printed parts (2 base plates, 2 hook parts) - 2 nails, diameter 2mm - Servo and associated link/rods - Tie wraps and double tape - Metal ring - Long lane (at least 1.5m) - One free channel on the receiver/radio Step 1: Printing Print your parts with ABS in medium resolution. Base plate volume: 21986.54 cube millimeters; hook part1 volume: 2557.12 cube millimeters; hook part2 volume: 3461.60 cube millimeters. Note that the servo arm and rod are not shown in pictures. Step 2: Surface treatment Smooth the surface of the parts with an acetone steam bath. Instructions are attached as a PDF file. After treatment, drill holes according to nail diameter and servo screws. Step 3: Assembly and installation Assemble hook parts and glue nail head to base plate. Install servo and shape rod accordingly. Attach landing skid to base plate with double tape and secure with tie wraps. Place base plate so the hook is under rotor shaft or turn it around as shown in pictures. Secure base plate to heli frame with double tape and tie wraps. Step 4: Testing and lift-off Before flight, check proper release function of hook and adjust servo travel if needed. Ensure emergency release switch is easily accessible. Check if modification affects control cables or rod. During first flight, use an empty tin or lightweight object. Be aware of impact on heli's CG and eccentric force from cargo hook. Avoid hovering in one spot; fly forward slowly. Practice controlling load like a crane. Update: A nicer lower end hook is available for download in STL format. If you don't own a 3D printer, use [www.3dhubs.com](http://www.3dhubs.com/) to find one nearby and pick up your parts. Two parts need gluing with acetone; upper part (grey) screws in while lower parts should be printed in same orientation for best fit.