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

June 18, 2016

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


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

XL-Viking 2

Have A Comment On This Article? Post It Here.

Comments are moderated and will not be published until approved. Your email address will be kept confidential. Please review our Comment Policy before posting your comment.


2 Comments on "Landing Gear – Rational Spin-Up and Spring-Back Loads"

Microsoft Excel Spreadsheets

FREE ANALYSIS SPREADSHEETS 3 Over the last 10 years we have developed hundreds of spreadsheet tools to help us with our structural analysis work. We have made these available through the Abbott Aerospace web site and the XL Viking project. We have now brought them into the technical library. They have been updated, improved and the collection has been expanded to cover more analysis methods than ever before.

The XL-Viking Add-In for Excel

XL-Viking 2 We created the XL-Viking Excel add-in to satisfy our own need to make Excel a better engineering tool. XL-Viking shows your Excel Formula in a way that makes sense and brings essential new functionality to Microsoft Excel by providing an additional user interface and easy to use functions.

The Indispensable Tool For Engineers, Mathematicians, Scientists, Accountants and Teaching Professionals!


Technical Papers & Reports

This is our collection of public domain references. All of the material we make available has been placed in the public domain by the authors/owners. If you believe this is not the case and any of the library material is not in the public domain please let us know. If you have any reference material that you would like to see included in the library we would love to hear from you.

Market Analysis and Market Information

Our newest addition to the library is an on-going series of articles on the aircraft and aerospace market. These are part quantitative and part qualitative and introduce a new aspect to the competencies within Abbott Aerospace.