how did the renaissance make colombus' voyage possible?

Answer 1

It was the air of questioning and exploration, the new culture of learning that made such voyages possible. There was a renewed system of courtly patronage, where the wealthy nobility were sponsoring the learned to further their knowledge and bring improvements to their lands as a whole.

Without the patronage, those ships would have never left port.


http://en.wikipedia.org/wiki/Renaissance

Answer 2

Think of the journey of Columbus as the Internet hype a few years ago.

There was money and people owning that money were intrigued enough by the prospect to invest in it. Be aware that in that period many many expeditions were led by enterprising men and many did not return. It was THE way to make 'fast' money in that era.