What do we do at Catapult Engineering? Why, we siege the day, of course! Teams build large outdoor trebuchets—catapult-like siege engines—for medieval challenges, like knocking down a mock castle wall. Hands-on engineering at its best: you get to break things! • lots of time outside • six feet (2m) apart, yet together!


• Five-day, Monday to Friday program:
9:00 a.m. to 4:00 p.m. each day

• Optional extended care:
8:00 – 9:00 a.m. $45 per week and/or
4:00 – 6:00 p.m. $90 per week

• Optional lunch: N/A

• Apply for our Counselor in Training (CIT) program:
Rising 10th-12th grade students call (315) 773-5673

• Limited to 10 children, rising 5th to 9th grade

• $25 sibling or multi-session discount applies

• Call for your personal referral coupon code and save!

• Child to instructor & assistant ratio is 6:1 or less

• Your instructor: Isabelle Nguyen, pursuing biomedical engineering

Program Curriculum

Children will learn to read and follow engineering plans to build an outdoor trebuchet within a team. They’ll learn engineering and construction principles and work with a variety of hand tools. Each child also assembles a take-home tabletop hurling machine, which is used in indoor play. Indoor medieval art projects and outdoor games keep everybody energized!

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The culmination of the week is a demonstration of the trebuchets for friends and family. The teams do all the figuring, aiming, positioning, and loading. We emphasize safety and adult supervision, so it is the lead instructor who inspects and sets the trebuchet before allowing it to be released.


Isabelle Nguyen

Biomedical Engineering at Boston University with a 3.78 GPA

Isabelle has considerable experience in computer aided design (CAD) while on a FIRST robotics team and more recently on a Formula SAE electric car team. King Richard I of England would have welcomed such credentials, when appointing her to lead the construction of his next trebuchet. The reason is simple; engineering principals are transferable. And as it happens, Isabelle is handy with tools and fabrication. She is ready to siege her new position as Catapult Engineering Instructor!

This fun medieval week allows your child to explore structures, physics, statics, mechanics, joinery, simple machines, construction and more, working with tools like tape measures, protractors, squares, levels, wrenches, levers and fulcrums, wedges, pulley blocks, and mallets.
In the process of building their own trebuchets, they’ll develop team building and leadership skills as they solve engineering problems, and enjoy the fun and satisfaction of building a machine that works with spectacular results!

Why choose EOS Catapult Engineering?

Really? Knocking down a castle wall from 40 meters away with a trebuchet that you have built, set up, and tested with fellow medieval engineers? Even adults want to register for this week!

Working in collaboration with fellow team members, your child will soon experience the satisfaction of performing a job, and doing it well, to advance a team goal. Children revel in the workshop atmosphere. Real engineering drawings and hand tools, fun physics, estimating, testing, strategizing, and action all combine to advance skill sets and build confidence.

Catapult Engineering location & dates

Siege the day and register!

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