The mission of RCPRO is to spread the fun and excitement of pylon racing to all R/C modelers regardless of the type of aircraft they build or fly, from Park Flyers to Giant Scale, with our primary focus on 2 pole racing. Web site for more information including links to Google Play and the Amazon Appstore. The Drill Bit Charts. Android app is a FREE drill size charts reference that anybody that drills holes can use. Visit Drill Bit Charts. On Google Play or Drill Bit Charts.