Blade Tip Speed, Drive Train and Blade Destruction

The Razorback mowers have proven to survive extremely harsh environments including rocky ground. In order to combat these harsh environments, the Razorback has addressed this issue with some totally unique physics.

The actual method of cutting larger vegetation relies on the material passing under the front axle, where it is fed into the blades, as there is no front on the deck. This provides a “bean slicer” action allowing the destruction of woody material up to 36mm in diameter.

By using a direct drive shaft, all available engine power is harnessed to the deck. This particularly applies when the low range gearbox is employed.

At the heart of the science is the idea that the blades are driven via a gearbox instead of pulleys and belts which results in far less energy loss. In order to address this further, the blade tip speed is drastically sloped between 12 to 13,000 feet per second – conventional mowers are closer to 18,500 feet per second. The blade tip speed, together with the “been slicer” action provides cutting ability that has to be seen to be believed!

Unique Blade System

The Razorback specialised blades are formed in a forge, and can withstand extremely hard rock. All these features combine to produce a totally unique cutter train that delivers a whole new level of performance, that has never been experienced in the lawn mower market, anywhere in the world!

Composed of a special steel known as Hirosaki Steel, the Razorback blades are manufactured with special techniques that give them similar properties to Damascus Steel. They boast incredible strength and endurance characteristics beyond any mower blade that we have ever encountered before here in Australia.

The blades are created through a complex process, which involves the metal being folded, forged, tempered and quenched repeatedly to achieve a special linear grain. This grain is what gives the Samurai Swords their legendary ability to cut hard materials and cause little damage to the blade.
These techniques have evolved over centuries, and thus enabled the Japanese to manufacture steel with incredible strength.

These Hirosaki steel blades, used on the Razorback, are extremely tough on impact with timber and rock material, and the advantage is that they can be sharpened without the need for specialist tools. Razorback blades can be sharpened by hand, or with an angle grinder that has a flap wheel. We don’t recommend the use of solid or reinforced abrasive wheels as they generate too much heat.

Tool vs Tool-less Blade Installation

The blade system for all mowers use the “Heartfelt Hirosaki” blades with Swing Blade Action. The only difference is that the 1401 and 1402 blade system is bolted to the mower and require a tool to install or replace the blade. The blade system for the 186 and 227 have a cleverly designed engineered large pin with unique self locking and release capabilities built into the blade carrier bar.

The Swing Blade Action serves as an additional safety feature on all mowers, that is engaged should the blades come in contact with hard materials, such as steel or hard rock, and helps absorb the impact by swinging the blades away from the hard material.  This helps to prevent any impact damage being transferred to the drive shaft and potentially harming the engine.

The Big Twin engined units, the 186 and 227, provide the added benefit of a tool-less system, not requiring a tool to change the blade. With these models you won’t have to fear loosing a tool or requiring to have access to a tool just to change the blades.

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