Redesigning Marine Propellers with the Environment in Mind
Sharrow Marine, headquartered in St. Clair Shores, Michigan, is focused on marine propulsion technology. In 2024, the company’s Sharrow Propeller™ was recognized as a finalist in Fast Company’s Best World Changing Ideas North America award category. The awards honor businesses and organizations that are developing creative solutions for “the most pressing issues of our time.” SBND recently interviewed Greg Sharrow, CEO and inventor of the Sharrow Propeller, about the company’s technology and its impact on the environment and the marine industry. Q: Tell us about Sharrow Marine and your propellers. A: Sharrow Marine designs and manufactures propeller technology. Our propeller – recognized as the first major advancement in propeller design since the 1830s – eliminates the traditional propeller tip vortices, which are a major source of energy loss. This “tip-less” design leads to a 30% increase in efficiency and reduces underwater noise by up to 80%, making it quieter than conventional propellers. From a sustainability standpoint, this means less fuel consumption, reduced noise pollution in marine environments, and lower carbon emissions. Q: How does your propeller design directly impact sustainability in the marine industry? A: Every one of our propellers is designed for a specific application, and our process allows us to predict thrust within these applications and design for maximum efficiency. This, in turn, reduces the amount of fuel a vessel needs to operate. A lot of the fuel burned in the tanker industry, for example, is bunker fuel, which is a less refined, high-sulfur fuel. By reducing the fuel required, we not only cut carbon emissions but also reduce the pollutants entering the water. This approach creates a significant positive impact on the marine ecosystem. Q: How does the increased fuel economy of your propellers translate to measurable reductions in carbon emissions? A: The math is straightforward – burn less fuel and emit less carbon. Our propellers are about 30% more fuel-efficient, which means a corresponding 30% reduction in carbon emissions. For fleet operators and the recreational boating community, this translates to significant savings and a smaller environmental footprint. Q: What challenges did you face in developing this product? A: The biggest challenge was essentially rewriting the book on propeller design. We had to develop entirely new theories of operation and create software to test thousands of designs quickly. Assembling a team of engineers and software experts to write the code was a feat, but we now have an incredible team. Another hurdle was manufacturing. Each propeller requires its own program and a multistep production process. Finding a manufacturing partner who could handle such complexity wasn’t easy. I traveled the world and ended up finding the right partner in my backyard, which is not surprising seeing as Detroit is the place for manufacturing. We were fortunate to partner with Detroit Dynamics. They’ve been incredible in helping us establish a fully functional manufacturing facility here in Detroit. Q: Beyond fuel efficiency and emissions, what other sustainability benefits does your propeller technology offer? A: Noise reduction is a big one. The noise pollution in our oceans that is created by cavitation generated from traditional propellers has a devastating effect on marine wildlife. Our technology reduces underwater noise by 3–15 decibels on average, which helps protect marine ecosystems. Additionally, all of our materials are sourced within the United States, further minimizing our carbon footprint and supporting local economies. In terms of sustainability in Southeast Michigan, Detroit is integral to who we are. This city has a rich history of engineering and manufacturing expertise, and we’re proud to be a part of that legacy. All our propellers are manufactured here in Detroit, creating jobs and supporting the local economy. Q: What opportunities does your technology present for fleet operators and recreational boaters? A: For fleet operators, the savings in fuel costs are massive, and for recreational boaters, the benefits go beyond fuel efficiency. Our propellers reduce vibration and noise, improve high-speed control, and make docking in tight quarters much easier. For the average boater who logs about 52 hours a year, the return on investment starts the moment they turn the key. Q: How do you see Sharrow Propellers contributing to the broader efforts to decarbonize the marine industry? A: We’ve already established a strong footprint in the outboard motor market, but the inboard motor market – specifically for blue water and oceanic vessels – represents a massive opportunity. These vessels are some of the biggest polluters due to their reliance on bunker fuel. By applying our technology to this segment, we can significantly reduce sulfur emissions and improve fuel efficiency, effectively decarbonizing a critical part of the industry. We’re also partnering with VEEM in Australia to bring our innovations to the global market and are in the process of growing to full production scale of the SHARROW by VEEM. Q: Looking ahead, how do you see your propeller technology fitting into broader sustainability efforts? A: We’ve been focused on the marine industry, but interestingly, the propeller was originally developed for use in the air. So, as we move forward, expanding into renewable energy applications is a priority. Whether it’s wind turbines, hydro-energy, or further innovations in marine propulsion, our goal is to make a meaningful impact on how energy is generated and consumed. 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University of Research Corridor Sustainability
BRITANY AFFOLTER-CAINE, IS THE EXECUTIVE DIRECTOR OF MICHIGAN’S UNIVERSITY RESEARCH CORRIDOR Students and young adults see climate change and the preservation of our planet not as an impending challenge, but one with grave consequences that are impacting humanity today. Generation Z is more likely than older generations to act on their climate concerns through their purchasing power and in career choices. A majority of Gen Z are willing to spend 10% more money for sustainable brands according to a 2019 McKinsey report, and 42% of Gen Z respondents have already changed or plan to change their job or industry due to climate concerns according to a 2023 Deloitte survey. For these future leaders and doers, the greatest priority is to develop sustainable solutions to mitigate these impacts and the forces causing further environmental harm. Gen Z is not alone. Many university researchers, staff and administrators across Michigan’s University Research Corridor (URC) share their climate concerns and have made sustainability a priority area of research, education, innovation and service. An alliance of Michigan State University, the University of Michigan and Wayne State University that is dedicated to improving the quality of life for its region while advancing knowledge at a global level, the URC is committed to bringing all its resources to tackling climate change and mitigating its impacts today and in the future. Sustainability is an imperative we define as efforts to discover ways to meet the economic and health needs of people today while meeting the needs of future generations to thrive in ways that are effective, just and equitable. Sustainability includes decarbonization, clean energy innovation, reducing waste and pollution and managing limited resources, such as water. The sustainability work of URC researchers and students stretches across dozens of academic fields and within dedicated schools and colleges, such as U-M’s School for Environment and Sustainability, and includes partners in our communities, government and industry. Development of sustainable technologies, knowledge and practices is critical for addressing climate change and is good for our economy. For example, Michigan’s mobility sector is accelerating its transition to a more sustainable and eco-friendly industry. It is reshaping the way people think about transportation, pushing automakers to innovate, and encouraging governments and businesses to invest in a cleaner future. The URC universities play a key role in developing new technologies to support the mobility industry’s transition. Over the past five years, Michigan’s URC universities conducted more than $565 million in mobility-related R&D, which included sustainability-focused research, such as light weighting vehicles through advanced materials, energy storage to extend battery range for vehicles and alternative fuels that are more sustainable, such as hydrogen. The contributions our universities are making to support sustainability in the market can be seen in our strategic innovation partnerships with industry, like at MSU’s top-ranked School of Packaging, where researchers are working alongside industry leaders to reduce the amount of plastic waste in landfills and water systems by streamlining the different types of plastics that are used in manufacturing. MSU is also a leader in mass timber research, studying everything from structural performance and cost savings to fire resistance and sustainability. Made from a renewable resource, mass timber stores carbon and is less carbon-intensive to produce than other common building materials. U-M’s BioMatters team has developed their own sustainable solution for construction using upcycled sawdust. This fully biodegradable, reusable and recyclable material is formed into molds using 3D printing and can replace concrete formwork traditionally used across the construction industry. These molds are like giant LEGO pieces that can be used again and again. At a time when the consequences of climate change are increasingly evident and devastating, the need for sustainable solutions across all sectors has never been more urgent. This starts on our own campuses, where we all have implemented comprehensive sustainability initiatives that encompass various aspects of campus life. We’ve invested in energy-efficient infrastructure, adopted renewable energy sources, and reduced greenhouse gas emissions through innovative technologies and conservation efforts, showing that the URC is not only contributing to a greener Michigan but also setting an example for institutions nationwide. From lead in drinking water and intergenerational impacts of pollutants to mitigating development of fatbergs in our wastewater systems to storm water management, Wayne State has been studying the impacts of climate change and environmental threats to human health on residents and communities in Michigan’s largest city, Detroit. Old pollutants left behind by factories and other industries in the past are causing problems for people and the environment today. Supported by an $11.5-million National Institutes of Health grant, Wayne State University’s Center for Leadership in Environmental Awareness and Research is studying these old pollutants in cities, identifying how they move around and their impact on the health of mothers and babies. Our commitment extends to our work in sustainable action in communities across Michigan and the world. Michigan is renowned for its abundant freshwater resources, including the Great Lakes, which contain about 20% of the world’s surface freshwater supply. The presence of these vast water bodies makes our institutions leaders in research on water-related issues and solutions. The United Nations tapped Wayne State University and the University of Windsor to head its Regional Centre of Expertise on Education for Sustainable Development in the Detroit-Windsor region. The partnership will address community health, equitable city-building practices, public transportation, clean water, sustainable urban planning and housing policy, to better our two communities that share an international border. U-M recently received a $5 million grant to study how climate change is affecting water resources in different areas, especially when those areas share borders. This research will help us understand how rising temperatures and changing weather patterns are impacting our water supply, like rivers and lakes, and lead to better ways to manage and protect these vital sources of water. Sustainability is already becoming the heart of academic and industry research. Not only are environmental and economic pressures mounting, but our next generation of thinkers and leaders are dedicating their lives to addressing these
