The CRP-5 is manufactured for use by commercial pilot training.
Designed particularly for the professional pilot, it includes all necessary functions for the commercial and airline transport pilot examinations. The circular slide rule side allows calculation and conversion of temperature, time, distance, volume, altitude, speed, weight, fuel, endurance, multiplication and division, 1 in 60 rule, compressibility correction etc. Coloured scales and lettering enhance operation and clarity.
Wind triangle side incorporates a sliding scale with speed range of 40-1000 and measuring scales on outside edges of 1:500,000 NM, 1:250,000 NM, Inches and mm. Clear rotating disc for lead pencil plotting. Mostly used for calculation of heading and groundspeed, wind velocity, head and crosswind components etc.