Mar 20, 2019

Frangible Fence Equipment Test Developed

By Leslie Mintz - USEA Staff

Dr. David Vos and the USEA’s Cross-Country Safety Subcommittee have developed a low cost, easily constructed testing system in order to test obstacles with frangible fence equipment to ensure that the fence will collapse when impacted under ap­propriate conditions.

The only materials needed for the test are:

  1. A 40 kg kettlebell
  2. 10ft of stainless steel chain of 5/32”
  3. Hooks and clevis
  4. Tractor and tractor bucket

“The whole point is to come up with an approach or means in which we can not only test future devices, but also current devices,” explained Vos. “In the field it is often not very obvious why [a frangible device] didn’t release. The point is to get to very strongly physics based solutions that are really easy to use in the field.”

The full parameters for the test are available here.

Watch Dr. Vos demonstrating the test:


If you are interested in learning more about Dr. Vos’ calculations behind how he developed the system and why the test works, watch his presentation from the 2018 USEA Annual Meeting & Convention during the Safety Open Forum here:



Learn more about frangible technology from Dr. Vos and Andy Griffiths in their article “Exploring Collapsible Technology for Cross-Country Jumps.”

About Dr. David Vos
Dr. Vos led Project Wing at Google [X] through Nov 2016, culminating in the world's first month long drone delivery service at Va Tech. Prior to joining Google [X], Dr. Vos was Senior Director at Rockwell Collins after the acquisition of Athena Technologies – a leading flight control and navigation systems company – in April 2008. Vos was Founder, CTO and CEO of Athena Technologies. Having worked in the unmanned systems industry since its inception, he is a pioneer and a thought leader in the area of Unmanned Aerial Vehicles (UAVs). Born in South Africa and now a U.S. citizen, Vos is the inventor and developer of Rockwell Collins Control Technologies core technology. He holds patents in nonlinear control systems and other areas and has broad experience in guidance and control systems. From August 2007 thru 2014, Vos was appointed by Virginia’s Governor to Commissioner of the Vint Hill Economic Development Authority’s Board of Commissioners. In June of 2007, Vos was named by Ernst & Young as an Entrepreneur of the Year winner in the Greater Washington area. Vos holds a B.S. in Engineering with Honors in Aeronautical Engineering from the University of Stellenbosch, South Africa, an M.S. in Dynamics and Control from MIT, and a Ph.D. in Estimation and Control from MIT, in the Department of Aeronautics and Astronautics.

Dec 08, 2022 Education

Show Jumping Building Seminar Kicks off USEA Annual Meeting & Convention With a Wealth of Information

Show jumping: there is so much more to it than just setting out a set number of jumps in a ring. Professional course designers Marc Donovan and Chris Barnard broke down the fine details that come with show jumping course design during the Show Jumping Building Seminar which kicked off the 2022 USEA Annual Meeting & Convention on Wednesday, December 7th in Savannah, Georgia. With an in-classroom session discussing rules, regulations, theory, and more, followed by a practical hands-on course building session held at the Savannah College of Art and Design (SCAD) Ronald C. Waranch Equestrian Center where participants were able to put all of the morning’s education to work, this year’s Show Jumping Course Building Seminar was full of useful information for both eventing lovers and course design hopefuls alike.

Dec 07, 2022 Convention

Meet Your USEA Board of Governors

During the 2022 USEA Annual Meeting & Convention, there will be two meetings of the USEA Board of Governors (BOG), one on Thursday, December 8th from 2:00 p.m. to 5:00 p.m. and one on Sunday, December 11th from 9:00 a.m. to 12:00 p.m. The USEA is run by a BOG of around twenty individuals. These individuals discuss and vote on important matters related to the organization and its members. BOG members come from all over our ten USEA areas and come from various backgrounds from grooms, to professional riders, to amateurs, to course designers, and much more. Each BOG member serves a three-year term.

Dec 07, 2022 Convention

Fast Facts: 2022 USEA Annual Meeting & Convention

USEA members from near and far are getting ready to converge on the historic city of Savannah, Georgia this week for the 2022 USEA Annual Meeting & Convention! With four full days jam-packed with educational seminars, committee meetings and social gatherings, the convention is sure to excite all members of the eventing community that will be in attendance. The USEA Annual Meeting & Convention will be hosted at the Hyatt Regency Savannah Hotel this year, and we have all of the information you need to know to make the most of your experience!

Dec 06, 2022

The Business Toolkit for Eventers

As USEA members prepare for the USEA Annual Meeting & Convention, the USEA is pleased to share “The Business Toolkit For Eventers” from our educational partner STRIDER. This webinar is part of their popular Professional Development Series for Equestrians, which features experts from across the horse industry speaking on business topics relevant to equestrian sport.

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Official Feed of the USEA

Official Saddle of the USEA

Official Real Estate Partner of the USEA

Official Equine Insurance of the USEA

Official Forage of the USEA

Official Supplement Feeding System of the USEA

Official Outerwear of the USEA

Official Competition & Training Apparel of the USEA