Denalt Computer

The DENALT (density altitude) computer is a circular slide rule. It is used to calculate rate of climb of aircraft. It is a handy additional method to compute takeoff distance and rate of climb. It is designed specifically for use with fixed-pitch propeller airplanes. Another computer, similar in format and use, is produced for variable-pitch propeller airplanes. An example of use of the DENALT computer, assume the following conditions:

1. Surface temperature - +80 Deg. F
2. Airport Pressure altitude - 4,000 feet
3. Takeoff distance under sea level standard conditions - 1,700 feet

Find the correct takeoff distances.