That's very interesting....I have a model of the yacht "America" (see avatar) that was built in 1968, in Brunswick, Me. , was sent to eastern Long Island, then moved to Dagsboro, De., then to Freehold, N.J., and finally to northeastern Illinois. Haven't seen any appreciable change in rigging tension, or heard of any, in the model's history, in spite of the varied environments it has been in. Then again, the model has been cased since it was built. I built the case, but would not guarantee that it was moistureproof.