Hylas Yachts has just launched its new M49, a two-cabin, two-head cruiser with a low  profile, a seakindly hull, and a 31-knot top speed. The company said it built the 49 as the request of owners of its 44 who wanted a larger boat. The third cruiser in the Hylas power fleet is a 58. Hylas has a worldwide reputation for building high-quality sailing yachts. It turned to Dan Salthouse, the New Zealand designer, to build the new 49 power yacht based on his successful design of the 44. Hylas boats are built by Queen Long in Taiwan. The 49…