Landing Gear – Rational Spin-Up and Spring-Back Loads

AA-SM-517There is a relatively simple method in the FAR part 23 appendix for calculating rational landing gear spin-up and spring-back loads. This method is referenced to and better explained in NACA-TN-863 which also has some other very interesting and useful data.

This Spreadsheet has a method for calculating the rational horizontal loads for the part 23 basket of cases. Note that the  braked roll horizontal loads is calculated using the arbitrary 0.8 coefficient of friction from the regulations.

This method can provide a significant load saving and weight saving over the simple method. However! As always there are caveats; this method assumes that the aircraft is landing on a well prepared runway, therefore the loads generated by the method are likely to under-predict loads for rough field landings.  If you are designing an aircraft intended for rough field use it is recommended that a rational approach is used to assess the load generated by rough ground or that the arbitrary horizontal loads from the regulation are used.


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Landing Gear – Rational Spin-Up and Spring-Back Loads

AA-SM-517There is a relatively simple method in the FAR part 23 appendix for calculating rational landing gear spin-up and spring-back loads. This method is referenced to and better explained in NACA-TN-863 which also has some other very interesting and useful data.

This Spreadsheet has a method for calculating the rational horizontal loads for the part 23 basket of cases. Note that the  braked roll horizontal loads is calculated using the arbitrary 0.8 coefficient of friction from the regulations.

This method can provide a significant load saving and weight saving over the simple method. However! As always there are caveats; this method assumes that the aircraft is landing on a well prepared runway, therefore the loads generated by the method are likely to under-predict loads for rough field landings.  If you are designing an aircraft intended for rough field use it is recommended that a rational approach is used to assess the load generated by rough ground or that the arbitrary horizontal loads from the regulation are used.


AA SEZC Banner #6

To try our free Stress Analysis Engineering Spreadsheets click below

FREE ANALYSIS SPREADSHEETS 3

To try our Add-in for Microsoft Excel for Windows click below

XL-Viking 2

2 responses to “Landing Gear – Rational Spin-Up and Spring-Back Loads”

Comment On This Post

Your email address will not be published. Required fields are marked *