Know your Nautical Terminology
ketch
A two-masted fore-and-aft-rigged sailboat with the aft mast (the mizzen) mounted (stepped) afore the rudder.
yawl
1. A fore-and-aft-rigged sailing vessel with two masts, main and mizzen, the mizzen stepped abaft the rudder post.
2. An un-decked boat, often beach-launched, worked under both oar and sail, and generally clinker-built. Used for fishing, serving ships in anchorages, salvage work, etc. Those from the northern parts of Britain tended to be double-ended.
For recognition purposes, a schooner will have main and mizzen masts of equal height. The mizzen of a yawl is generally, often strikingly smaller than that of a ketch. A sloop has a single mast and performs much better to windward than a ketch or yawl which is why the latter are rarely used for racing. Where ketches and yawls truely shine is in heavy weather. A ketch is more stable & forgiving than a sloop in high wind and a yawl even more so. Since the sail area is distributed over two masts, the main mast of ketches and yawls are shorter making them easier to fit under bridges.
It's ketch as ketch can. 
It's a yawl y'all. 