TechNote: MS Excel Pivot Tables: Drawing Register P-51
The drawing archive collection for the Mustang P-51 includes an NAA Document register in PDF that lists all the Scan Index Numbers, Drawings Number, Aircraft Type and Change (Revision)Number.
To make sense of this large archive; containing thousands of scanned images; it is necessary to first transpose the comprehensive NAA document register into a spreadsheet in order to analyse and filter the data according to requirements.
My requirements are simply to be able to group the data per content; Fuselage, Wings, Equipment etc; and per aircraft type; P-51A, P-51B, P-51C etc.
Further breakdown of data would involve isolating the main assemblies and then parts or sub assemblies belonging to each.
From Adobe Acrobat I extracted the pages of data as spreadsheet tables to which I added a Drawing Description and grouped the data sets together by “Content”…that took a long time to do as the extracted data first had to be checked and then sorted accordingly.
The drawing descriptions came from an index already created by Norman Meyers at Chanute Air Museum, so it was relatively easy to enter this data into my spreadsheet. Its a real pity I had not had access to Normans data earlier; could have saved me a lot of work. My thanks to Norman Meyers.
What I really want now is to identify and organize the drawings belonging to each type of aircraft. For this exercise I use the Pivot Table function in Excel. Pivot Tables are great for organizing and summarizing data according to specific criteria.
When working with large data-sets it is good practice to select a new worksheet for inserting this new table.
What we end up with is a new worksheet with the pivot table outline on the left and a selection box on the right. We now select from the latter the columns of data we want…in this case all the main ones plus the P-51D; which will populate the outline table on the left.
Pivot tables by default include a summary row under each entry; I suspect this is more useful for statistics than organizing a document register; which we don’t want.
The final step is to filter the data according to the required criteria; in this case I want all the drawings that have an “X” value in the P-51D column.
We now have a list of all the fuselage drawings and their location in the archive belonging to the P-51D aircraft.
The next step would be to extrapolate all the “assembly” drawings and from there the components that make up each assembly…but that’s for another day.
Pivot Tables are great for this type of job.
- 846 fuselage drawings for the P-51A
- 890 fuselage drawings for the P-51B
- 833 fuselage drawings for the P-51C
- 923 fuselage drawings for the P-51D
- 950 fuselage drawings for the P-51H
Many drawings of course are a shared resource for all variants.
For further information on any of these projects please feel free to drop me a line via my contact page or email me at firstname.lastname@example.org