Decalage is the diference between the angle of incidence of the wing and angle of incidence of the stab. You want very little or no decalage during the high speed launch, then a transition to more decalsge for proper glide trim. My spell checker has never heard of decalage, so I suppose it is not common in general conversation.[]

Part of the problem is that all the gizmos for the dethermalizer where in the pictures and making them confusing. If I had written the article, I would have made a simple show and tell model to show the basic idea, and then the photos of an actual set up.