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By The Hacksmith

The Hacksmith: The Most Powerful Leaf Blower in the World

Ever wonder what the world’s most powerful handheld electric leaf blower looks like? The most powerful electric leaf blower that consumers can buy blows wind at 600 CFM (cubic feet per minute). The most powerful gas-powered leaf blowers put out around 900 CFM. Instead of just beating the record, this model shatters it. The Hacksmith team’s design is about five times more powerful than a gas-powered backpack blower, putting out an estimated 4,500 CFM.

See how it was made in the video below!

 

How Does It Work?

This leaf blower’s barrel has an 8-inch diameter cardboard tube made for concrete forms. It’s powered by 14 x 40Ah 3.7 volt lithium-ion batteries. That’s a lot of batteries to fit in a device. The batteries modular and are arranged in a way that puts the positive and negative terminals about an inch apart. In order to house all these batteries “safelier”, a special enclosure was made to keep them tightly packed around the barrel without shorting. The enclosure is shaped somewhat like Iron Man’s Arc Reactor.

The battery formation sits in a housing that was plasma cut from steel, then surrounded by an acrylic plate. The arc reactor formation is to keep the batteries from touching each other and shorting, but the enclosure was made to keep the user “relatively safe” in case there is a short.

A knob allows the operator to transfer power from the batteries incrementally to fan, which is propelled by a three-phase Schubeler BLDC motor. The circuit also contains a temperature sensor to let the shutdown the system if it’s overheating. Lithium-ion batteries are pretty safe compared to the lithium polymer batteries the Hacksmith usually uses but lithium batteries can become quite volatile when overheated. It also has a kill switch, should the operator need to shut it down due to overheating — or if the leaf blower becomes sentient and tries to take over the world.

The leaf blower includes a shoulder strap — on top of just being heavy, it has about 50 pounds of kick.

Schematic and BOM

 

 

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