1972 Cessna 172 Skyhawk is an American aircraft, which was designed by the Cessna Aircraft Company. It is presumably the most successful in the history of aircraft due to its popularity and longevity. The company had built 43000 airplanes by 2015. Due to reliability issues, the company designed the Skyhawk P or 172P model in 1982 (Globalair.com, 2019). Therefore, it is essential to assess the operational characteristics of the aircraft.
The landing roll of an aircraft is the horizontal distance covered by an airplane immediately after touching the ground until it stops or leaves the runway. The approximate ground roll for Cessna 172 during landing is 575 feet. Besides, the estimated total distance covered over a 50-foot obstacle is 1335 feet (Aeroatlanta.com, 2004). The force of friction applicable during a landing roll is relative to the nature of landing for Cessna 172 aircraft. For instance, normal landing and short-field landing apply 60-70 KIAS airspeed (Takewingaviation.com, 2019). The maximum landing weight is approximately 2300 lbs (Takewingaviation.com, 2019). It is equivalent to the friction exerted. The friction force during a landing roll is influenced by windy conditions, nature, and material of surface and runway slope. For instance, a concrete runway provides better friction than the grassy runway. As a result, it affects the average friction during a landing roll.
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The maximum friction coefficient during rolling and braking wheels depends on the dragging, cornering, or the skidding of the aircraft. In calculations, the common denominator is the vertical force (Yager et al., 1977). The numerator varies among drag force, skid force, and cornering force. Therefore, the friction force for braking wheels and rolls is determined by the friction coefficients. The friction force applied when the aircraft has no lift is relative to the weight of the aircraft with no lift. The standard weight for empty Cessna 172 is approximately 1393 lbs for Skyhawk and 1419 lbs for Skyhawk II (Takewingaviation.com, 2019). Hence, this is equivalent to the total friction forces for the aircraft with no lift.
References
Aeroatlanta.com (2004). Cessna 172 Performance specifications. Cessna Aircraft Company. Revision 5. Retrieved from http://aeroatlanta.com/docs/aero-atlanta-c172sp-poh.pdf
Globalair.com (2019). Cessna 172P: Technical Specifications. Retrieved from https://www.globalair.com/aircraft-for-sale/Specifications?specid=131
Takewingaviation.com (2019). Skyhawk Cessna Model 172N: Performance Specifications. Pilot's Operating Handbook. Retrieved from https://takewingaviation.com/wp-content/uploads/2017/02/N739EF_172N_POH.pdf
Yager, J. T. & McCarty, I. J. (1977). Friction Characteristics of Three 30 x 11.5-14.5, Type VIII, Aircraft Tires With Various Tread Groove Patterns and Rubber Compounds. NASA Technical Paper 108. Retrieved from https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19780005100.pdf
