The team

Joost™ Engines was founded by Ollie Jukes in 2014, with the backing of Longwall Ventures

The Joost engine has since been developed from concept to proof-of-product and the company is now building a team to launch its first product, the Joost Outboard.

The Joost Board

Ollie Jukes

Founder & Technical Director

The Joost Engine is the brainchild of Ollie Jukes, a former design engineer at Rolls Royce.

As a keen off-road motorcyclist he felt frustrated with engine manufacturers replacing simple, lightweight 2-strokes with complex, heavy and expensive 4-strokes.

With the backing of Longwall Ventures, he has since spearheaded the engine’s development through multiple prototype iterations, securing a strong family of patents along the way.

Ollie is now overseeing validation and productionisation of Joost’s launch, outboard engine product.

David Denny


David is a Partner at Joost’s lead investor, Longwall Ventures. David started his career as a graduate engineer in Carnaud Metalbox (now Crown Cork), working in a range of roles from R&D to production and project management. David spent much of his career living and working overseas in Spain, Argentina, Belgium and France. David did his MBA at Harvard Business School, after which he joined Z Corporation, an MIT licensee start up. He spent several years growing the European and Asian businesses before entering the venture industry.

Longwall Ventures has backed Joost since 2014.

Longwall Ventures invests in innovative, UK based, early stage companies in the healthcare, science and engineering sectors.

Longwall manages three funds totalling £145m, targeting companies that have the potential to disrupt an existing market or gain a material share of a new market.

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