I think he built it with the help of his uncle.
It was a model made perhaps by looking at maple seeds falling. Look at the link below:
He did build a working model of one.
Leonardo da Vinci did not actually 'make' a helicopter, he just drew his concept of it.
Leonardo da Vinci invented the bicycle and the helicopter.
No, there is no big church conspiracy as far a Leonardo da Vinci is concerned.
He drew a sketch anyway.
Leonardo da Vinci
He did not, Leonardo da Vinci did.
Leonardo da vinci
Leonardo da Vinci - early 1480's
The helicopter.
Leonardo Da Vinci
From Leonardo da Vinci