Water-powered Bajaji shines at DITF

DAR ES SALAAM: A LOCALLY engineered three-wheeler (bajaji) running on both water and fuel is turning heads at the 49th Dar es Salaam International Trade Fair (DITF), offering a low-cost, high-impact transport solution all made in Tanzania.

Developed by Andrew Mmbanga in collaboration with engineers from the University of Dar es Salaam’s College of Engineering and Technology (CoET), the innovation is praised for its potential to reduce fuel consumption without compromising performance.

Designed for simplicity and affordability, the threewheeler addresses the needs of Tanzanian drivers facing rising fuel costs and maintenance challenges.

“In the beginning, I built the bajaji myself,” Mmbanga said at his trade fair booth. ‘Later, I brought it to the university for technical refinement, where we realised the original model needed a complete overhaul.”

Working with CoET engineers, Mmbanga completely redesigned the vehicle. The final model features a custombuilt water-cooling system that boosts engine efficiency and reduces fuel consumption.

The bajaji’s engine includes a tank that stores clean, salt-free water to cool the cylinders and prevent overheating. As the water circulates and heats up, it flows into a radiator where a fan cools it before recirculation.

“This process keeps the engine cooler for longer, so it uses less fuel than conventional systems,” explained Mmbanga. “With daily use, the same water can last up to a week if kept clean and foam-free.”

He warned that neglecting water maintenance or using salty water can clog the radiator’s tiny channels. “Foamy or dirty water builds up and blocks the radiator, so we recommend using only clean, fresh water.”

Mmbanga envisions expanding beyond this prototype by establishing a small-scale factory to produce three types of bajaji: gas-powered, solarelectric and standard petrol models, all equipped with fuelsaving technology.

ALSO READ: 3,400 firms enlighten business at Sabasaba Fair

“After DITF, we’ll take the vehicle to COSTECH for official evaluation and road tests. Once certified, we’ll finalise with the market price,” he said.

DITF visitors have been attracted by both the innovation’s uniqueness and practical benefits.

“This invention will lower operating costs for drivers,” said John Julius, who spoke with Mmbanga at the booth. “That means more profit and financial stability, especially for youth in transport.”

Another visitor, Sabato Masanja, called for targeted financial support for community-focused innovators.

“People like Andrew should be prioritised for funding. They’re solving real problems affecting society,” he said.

As the DITF showcases products worldwide, Mmbanga’s bajaji reminds visitors that some of the most impactful innovations come from home.