About Greenheart

Greenheart vessels are simple, sustainable, low-cost, zero-emissions ships designed to move people, products, and ideas around the globe while stimulating innovation, empowering local entrepreneurship, and providing marginalized communities with a means to participate in the global economy and to reclaim their connection to the oceans.

Technology Utilized

• Sails and sail-handling equipment scaled up from modern recreational sailboats
• Robust solar electric system: regular rooftop solar panels, valve-regulated deep-cycle lead-acid batteries, and electric motors
• Modern onboard electronics for navigation, communications, etc.


• Roll-On, Roll-Off (RORO) port for flexible loading and access
• Onboard crane for autonomous cargo handing
• Cargo hold that can accommodate standardized containers as well as smaller cargo
• Intentionally shallow draft and reclining mast to allow for beach landing and access nearly anywhere (shallow harbors, up rivers, under bridges, etc.)


Initial craft is designed as small-scale, multi-purpose cargo vessel:
• Overall length: 32 m
• Beam: 7.5 m
• Displacement: 220 t
• Sail area: 400 m2
• Cargo Capacity: 3 standard 20ft shipping containers (i.e. 3 TEU) / 70 t weight
• Min./Max. Crew: 4 persons / 18 persons
• Hull Speed: 10-11 kn
• Expected operating speed: 6-7 kn

Note: As an open-source project, our designs are in constant evolution. For the latest versions of our designs please visit the Design Forum


• Cargo
• Ferry
• Fishing
• Mail ships
• Research
• Eco-tourism
• Passenger travel
• Environment clean-up
• Disaster recovery
• Temporary solar power station
• etc.

Estimated Costs

Initial build cost: $550- $650k
Anticipated cost when scaled for increased production: $350-$450K
Anticipated fuel costs: $0

Maiden Voyage Ports of Call

Dhaka, Bangladesh → The East Coast of India → Sri Lanka →Kerala → Zanzibar → Southeast Africa → The Cape of Good Hope → Southwest Africa → The Gulf of Guinea → Northern Brazil → The Antilles → Haiti → The East Coast of the United States (Boston) → The Canadian Maritimes (Halifax)→ The North Sea & Europe’s West Coast (Iceland; Norway; Denmark; Hamburg, Germany; France (Nantes), England (Bristol); Spain; & Portugal) → The Caribbean Sea (Haiti) → The Panama Canal → Polynesia (Kiribati → Fiji)→ Micronesia → Philippines → Japan → Vancouver/ Seattle → San Francisco → Kiribati → Papua New Guinea → Indonesia → Singapore → Myanmar → Bangladesh

Current Supporters

• Germanische Lloyd (GNV DL)
• World Wildlife Fund
• Upsolar
• Iridium
• Western Marine Shipyard
• Deltadesh
• Dykstra Naval Architects
• Avel-Vor Technologie
• GreenFlow

High-level naval architecture advising from:
• Peter Schenzle, Hamburg Institute for Experimental Shipbuilding (HSVA)
• Dr. Takeshi Kinoshita, University of Tokyo Department of Mechanical Engineering and Naval Architecture