Whether you are solving wind triangle problems, polar grid navigation or pressure pattern flying they will prove their usefulness and versatility constantly. Useful in high and low speed problems they automatically compensate for temperature rise and compressibility factors.
  • Large 6" Diameter
  • The original standard issue circular slide rule for pilots
  • Due to its larger easier to read numbers it gives the user increased accuracy.
  • Solid construction with performance and durability 
  • Includes vinyl protective case