Phil Morrison cut his teeth on the same development classes (the National 12 and Merlin Rocket) as his predecessors, and went on in the 90s to develop new boats, such as the Laser 5000. These use foam sandwich GRP construction which allows for the use of lighter and flatter panels. These new designs are usually manufacturers one-designs, with fully battened mainsails and asymmetric spinnakers, which are far easier to handle than conventional sails.