[quote=Legion X51]
Is that so? Tell me, how is a cannon on a galleon more common and acceptable than land cannons?Let's give you a quick history lesson.The first cannons on land in the British Isles and France were used in 1327 by the English against the Scottish - King Edward III was given an early cannon, known as the pot-de-fer, which was an early mortar, for his coronation. The most well-known example of cannons being used was in 1346 at the Battle of Crecy by the English against the French during the Hundred Years War - these were ribauldequins, or organ guns as some know them as - basically a collection of barrels mounted on a carriage which were all fired at once as a huge 'shotgun'. These devastated the French in the battle, according to Giovanni Villani:"The English guns cast iron balls by means of fire… They made a noise like thunder and caused much loss in men and horses… The Genoese were continually hit by the archers and the gunners… [by the end of the battle] the whole plain was covered by men struck down by arrows and cannon balls." Now, moving on to things bigger than a ribauldequin, let's look at the Ottoman Siege of Constantinople in 1453:"When Sultan Mehmet II laid siege to Constantinople in April 1453, he used 68 Hungarian-made cannon, the largest of which was 26 feet (7.9 m) long and weighed 20 tons. This fired a 1,200 pound stone cannonball, and required an operating crew of 200 men."
 This is in the 15th century, and it is clearly contradictory to your argument that land cannons are less realistic and less acceptable than sea-borne cannons. Let's look at other historical 'superguns'.Pumhart von Steyr, Austrian supergun made in the early 15th century. Had a calibre of 800mm.Dulle Griet - Belgian supergun made in the early 15th century. Had a calibre of 640mm.
Mons Meg - Scottish supergun made in Flanders in 1449. Had a calibre of 510mm. 
Land cannons aren't acceptable? Please, do some research if you want this to be realistic.
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...screw you, Legion.
I never said land cannons are unacceptable, merely that they are rarer and more expensive that cannons on boats.
Ok, let's take history out of it for a jiffy. I have a cannon on a Galley. It's designed for sea-based combat and sinking boats. It is therefore smaller, lighter and has a lower calibre than a siege cannon. It's designed to sit on a lightweigh boat alongside many others of its kin.
With a Land cannon, it is designed to punch through the thick walls that surround a city. It is therefore heavier, bigger and stronger than the cannon on the Galley. It doesn't need to worry about weight or other cannons as much, because it won't sink the continent. Because it's bigger and stronger, it is more expensive.