The explanation of the test found on the website is as follows:
"This is for a university psych project. We are trying out this new form of spatial ability test. It is much harder than most tests, and the mean score from our testing so far has been 3.64/9. Your participation is helping us get more reliable data for these items and is very much appreciated."
Gary Hinze that had a top score made this comment about the connection he saw between model aviation and spatial ability:
"What does this have to do with model airplanes? Relational skills, problem solving skills, spacial imagination, reading drawings, all involve skills used by modelers. Some of the skills relate primarily to geometric figures, some generalize to other kinds of activities. Some modeling skills may have nothing to do with the skills exhibited by this test."