4M Project Kits - Green Science Wind Turbine Kit Turntable A servo that has to

A servo that has to work less to center or stop without overshooting position is using less energy

Some modellers only run 8-wheel and 12-wheel diesels and don't need to power their frogs as they always have good contact

Perfect for modeling all types of modern light industry or warehouse operations

and The Bad Batch

4M Project Kits - Green Science Wind Turbine Kit Turntable A servo that has to4M Project Kits Green Science Wind Turbine Kit Build your own wind turbine! Watch this working wind turbine capture the wind's energy and turn it into a light! The kit will teach you how this vital renewable energy technology works. Ages 8+