A sailboat model that was designed and first built in Massachusetts back in 1921 is still gracing the waters of New England a century later.Bill Womack, a Vietnam War veteran and former civil engineer, considers himself the fourth steward of the Beetle Cat Boat Shop, which is now located in Wareham.The business namesake, John Beetle, built the first Beetle Cat in New Bedford 100 years ago as a way for children to learn the skill of mastering a gaff-rigged working boat. The Beetle family was famous for building whale boats, Womack said.Soon, the Beetle Cat evolved into the perfect sailboat for yacht clubs and summer camps. By the end of World War II, the Beetle Cat was all the rage. Everybody in the 50s and 60s, in this area, learned how to sail on a Beetle Cat, Womack said.Since 1946, every Beetle Cat ever made was built on the same exact mold and in the same exact way. The wood used for the boats is even dried out the same way a year per inch of thickness. We make sure