can't delete substitutions within model

[mjburton11]

I'm trying to the following in solar

  class Aircraft(Model):
      "vehicle"
      fuseModel = None
      def setup(self, sp=False):
  
          self.wing = WingGP()
          del self.wing.substitutions["\\tau"]

but it won't delete the substitution. If I delete it after creating mission, it will delete. Is this behavior intended?

[bqpd]

Oh dang I bet this is related to #1175...this substitution is a value?

[bqpd]

Yeah, it's something that occurs in performance models, which pull the substitutions back out of the value; then when the mission combines them, the \\tau substitution has magically reappeared

[bqpd]

Hmm you know what...both this and #1175 would be fixed if values were removed from a variable after being used...that could be kinda odd though