In August of 2015 at a CMASS launch, I over heard Howard Greenblatt suggesting to a college students that they keep a log of their launches. Howard said the information is useful and it's fun. Since then I have been documenting each of my launches in a notebook. I have enough pages in book two for one more launch. Last Saturday I summarized all the launches I attended by location and by what engines I used. Come to find out that I have launched 118 rockets at club launches and another 9 at a field in Peabody. Of the 127 launches, 118 were black powder and 9 were E or F composite engines. The engine I used the most was 38 of the Estes C11-5. In second place was 29 B6-4's followed by 20 A8-3's. I was wondering if anyone else in the club documents their launch data? I find it very helpful when it comes to what engine, delay or chute to use. The information is also helpful when it comes to designing scratch built rockets. I look forward to hearing from other rocketeers.