Perhaps try naming like pizza shops used to do with their ads in the yellow pages. AAAAAAAAAAA Helipad. lol.
I get what you're saying. I would just use what ever word best describes your model, but this brings up a problem with how some users may tend to search for models. "Heli pad" , "heli-pad" or even "helicopter landing pad".
I'm not certain of how the search algorithms work here, but with so many models of similar objects, does a search always bring up the same results each and every time, based on, either, date uploaded, or artist name? Or does it mix it up, giving different results for the same query, perhaps giving more artist's work a chance to be viewed? I would assume putting in more keywords would reduce the number of results in each query, however, it may increase the number of results, in your example....Helipad, Hospital, Aluminum, Red where it would bring results of anything with hospital or aluminum as keywords.