Ottoman Bombard and Da Vinci's Cannons

[HeroSK]

Hi all,

I am a huge Da Vinci fan and this question is in mind for a long period of time. Here the picture of Ottomans famous Dardanelles gun that is casted at 1464 and believed that the building manner is same as cannons used to pound the walls of Constantinopole in 1453.

Here the drawings of Da Vinci (1452 – 1519) that shows some cannons very similar to those Ottoman bombards ;



So the following questions arise, Did Da Vinci had a chance to see those cannons or he drow that ones just from his mind ? Why they are so similar ? Were this type of cannons common ? Is there any other examples similar to those cannons ?

Thanks in advance