Aerospace/Aviation/Cessna 152

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Question
Hi, I have questions about Cessna 152. What are the forces to be applied on Cessna 152, if the right wing contact the solid wall during taxiing? What are the effects on primary and secondary structure? What is the effect to the pilot and passenger? Thank you.

Answer
Your problem is not easily solved because the force on occupants is based on information that is nearly impossible to obtain unless a laboratory controlled crash occurs .

The formula for force is F = m*a
where:
m = mass
a = acceleration or in this instance deceleration

The mass is known, a C152 would be about 1500lbs
However the time that it took for the plane to come to a stop would
not be able to be approximated. The wing crumples as the airplane comes to a stop.
If we assume the plane was going 10mph and came to a stop in 1 sec then the acceleration
is 10mph =5280ft/60min/60sec = -15ft/sec
1500lbs*15ft/sec = 22,500 ft/lbs force

If we assume that the wing struck the wall with 1sq/ft (144sq/in) of area then
there was a force of 22,500lbs / 144 = 156lbs per sq in on the wall and wing.

Also, since 33ft/sec/sec is equal to one G and the plane decelerated at approximately
1/2G(15ft/ses/sec), the total load on the structure and occupants would be an additional 1/2 G.

The load on the structure of the airplane would not be able to be determined
because it depends on the exact spot that gets hit and what structural members
the load is transferred to as well as the effects of tire friction to the spin torsion
of the fuselage.

The links below provide interesting study of collision problems.
http://www.physicsclassroom.com/calcpad/momentum
https://www.youtube.com/watch?v=-vdk5J-9S0I

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J. Zumwalt

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Aeronautical Engineer, Pilot & Air-frame & Power-plant mechanic (A&P), Current president of EAA (experimental Aircraft Association) chapter 837 (Payette, ID), Past instructor, computers, robotics and aviation, Past Director of Maintenance (two airlines), Past Continental Airlines shift supervisor (Anchorage, Alaska)

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FAA certified commercial pilot FAA certified (A&P) Air-frame & Power-plant mechanic Aeronautical Engineer - University of Anchorage (Alaska) High school instructor, computers, robotics and aviation Current president of EAA chapter 837 (Payette, ID) Past Director of Maintenance (two airlines) Past Continental Airlines maintenance shift supervisor (Anchorage, Alaska)

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Current president of EAA chapter 837 (Payette, ID)

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FAA certified commercial pilot FAA certified (A&P) Airframe & Powerplant mechanic Aeronautical Engineer - University of Anchorage (Alaska) FCC MROP-Marine Radio Operators License FCC GROL-General Radio Operators License FCC RADAR endorsement GEN FAM certificates MD aircraft GEN FAM certificates Boeing aircraft State Instructor License High school instructor, computers, robotics and aviation

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