You see a crawler crane XL with eight Electricity Operate motors (four XL-motors, four M-motors), and managed by four IR receiver. Top of this crane is approx. 170cm and designed with much more than 4700 LEGO® sections.
IR remote regulate:
Channel one: Elevate up/down the suspended ballast (XL-motor), Winch one, to go the Derrick boom (M-motor)
Channel 2: Winch 2, to go the key boom (M-motor), Winch 3, to go the luffing fly jib (M-motor)
Channel 3: Travelling gear still left (XL-motor), Travelling gear proper (XL-motor)
Channel four: Winch four, to go the hook, Turn the crane
Post time: Nov-08-2016