Starling Burgess and Olin Stephens produced four designs for Vanderbilt; Models 77 A to F and two combinations. Models were built on a scale 1/24 and for the first time those models were tested in towing-tanks. When the trials were finished, the team concluded that 77-C either outperformed its rivals or came very close to the best. The selected model 77-C was used to built 'Ranger', the first 'Super-J'.

It is hull 77-F that has now been built as Lionheart, 75 years after she was conceived on the drawing boards.