This version features a lighter rotor fan. It uses parts from the pirates ship to allow for free rotations. Luckily, it doesn’t affect the exterior much. I have also added the motor and gearbox from set 4957, and installed the battery inside. Anyway, in my 20 years of LEGO® building, this is my first time to make DIY mechanical parts.
I have been planning for this since my trip to the Netherlands. Through a lot of R&D, failures, and damaged Technic® parts, I have finally finished this after 6 months. I have applied the slot technology to the model.