Of course, the exact look of the lazy jack will depend on the ship construction and the budget. Lazy jacks are basically webs of lines which run between the mast and the boom, preventing the lowered sail from falling onto the deck. Simply, a lazy jack is a type of rig which can make lowering or raising the mainsail easier. Using a lazy jack to hoist the mainsail.Within this article, we will cover the following: Basically, all you need to use a lazy jack is a line, rope thimbles or blocks, some pad eyes, and some basic sailing knowledge. If so, we're here to teach you everything you need to know about using a lazy jack. Do you ever wonder what exactly a lazy jack is and how it can help you sail better? If so, we’ve got all the answers you need.Īre you struggling with hauling down the mainsail? Or want to make difficult weather conditions a little more manageable?