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I can add new properties very quickly to MyFlightbook. I tend, however, to strongly resist combination properties because they can lead to inconsistency and weirdness. There are two kinds of combination properties in particular that I resist:
  1. Conflating an aircraft property with a flight property (e.g., tailwheel time and solo time)
  2. Conflating two flight properties (such as PIC/Cross-Country time)
I.e., I don't like to have a way to explicitly record something that can be computed. The issue is precisely that fact: if it can be computed, then having you enter it is a waste of your time if you do it correctly (e.g., making you enter 2 hours of multi-engine time when you flew 2 hours in a Seneca.), and it's ambiguous if you do it incorrectly.  E.g., what does it mean for purposes of your multi-engine time if you log 1 hour of multi-engine time but 2 hours of PIC time or total time in the Seneca? What does it mean if you forget to log multi-time in the Seneca flight? For things like PIC and Cross-Country (XC), a little more interpretation is required for the computation, but the issues are the same. Fortunately, usually one of the two properties (such as XC in this case) is a "whole flight" property (e.g., a 2 hour flight generally has to have 2 hours of XC) so the formula MIN(PIC, XC) can pretty accurately capture how much PIC-XC time that flight contributed. It's an approximation - and thus imperfect - but in practice I think the error from this approximation is less than the error from forgetting to record all of the possible combinations of attributes for a given flight.

A final reason I don't like combination properties is that the combinatorics can get huge quickly. If I can combine PIC, SIC, CFI, Solo, and Total time, for example, with just 10 other properties (Cross Country, Night, etc.) that would be 50 properties right there.  Bleah.

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