A modification you will want to make on the Sea Dancer 60 is to increase the heigth of the vertical fin/rudder by at least 2".This will greatly improve the directional stability and recovery of the model during aerobatic manoeuvers.This tip came from the designer himself during an e-mail exchange I had with him years ago prior to his death .He said that the original RCM "Sea Dancer" article had already been submitted and sent out to the printers before he finally realized the potential flaw and he was not able to go back and revise his design unfortunately.Snap manoeuvers can produce the result of a irrecoverable spin depending on how the model is equipped and set up.