Variable pitch props for indoor airplanes.

This year I got into using variable pitch props, you really need it for low ceiling flying. Here I show details of VP hubs for my F1R, F1L, and Pennyplane airplanes; VP props greatly extend the flying time! Some further details about my PP VP hub and things I learned about Pennyplanes from the pros can be found in this thread at HPA: https://www.hippocketaeronautics.com/hpa_forum/index.php?topic=26626.0