Hi Luke I just want to explain a little about how the site works. When we started everything was given away for free but we had surprisingly little given back. So little infact that we did not think the site could survive without greater content generated by our users. We changed our policy so that only XLC Pro subscribers had full access to the Repository. At the same time we introduced our earn your subscription scheme
and we particularly had students in mind because we did not want money to be a barrier to entry.
Since making the changes we have benefited from greater users contributions. User contributed calculations can be on any subject what so ever. Maybe you could take a look at Stuart Gaunt's contributions
- he is a civil engineering student at Nottingham University in the UK. He might be able to give you some ideas. I look forward to awarding you your free subscription