I have some questions about designing advanced aerodynamic components for experimental model aircraft. Would these be allowed here?
The "aerodynamics" aspect would certainly be on-topic here (and we have quite a few folks on the site who could probably help out with that aspect).
The "model aircraft" part is a bit more of a gray area: Most of the questions we have about model aircraft are related to regulations and sharing the airspace, and I'm not sure that questions specifically about building model aircraft are a great fit for the site, but I wouldn't automatically call them off-topic either.
They have been generally allowed, as they might fall in the "enthusiast" part of the site:
site for aircraft pilots, mechanics, and enthusiasts.
Just a friendly heads-up, though: be specific and try to avoid overly broad questions, they end up being closed.