Talk:Thunderdrum/@comment-27624304-20190217181217/@comment-24413325-20190217191923

53 ft 7 in is from the Wild Skies model (which is almost certainly the one they use at DreamWorks), and the 150 ft is, how do I say it, based on size comparisons with Toothless. As seen in HTTYD 2, Toothless would easily fit under a Thunderdrum's wing. Scaling the model as needed, the smallest size at which Toothless fits under the wing was found to be is 38 meters (with a stretched wing), and the largest (or, most fitting) is 46 meters/150 feet.

Now, in the movie when the Thunderdrum emerges from the water, its wings are curwed, and there is still leftover space at the edges of Toothless' wings, thus the 38 meter figure is too small. Doing some more scaling and posing, the 46 meter figure was found to be an almost exact fit.