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EXTREME POWER & FUEL EFFICIENCY

Our FM PRO Flail Mowers are known for their high power and reliability, while maintaining good fuel efficiency.

Designed for the full range of topping and mowing tasks, from thick dense rushes to fine topping of parkland, the FM series Flail Mower can tackle anything thrown at it.

  • Powerful 25hp Honda Petrol Engine
  • SmartCut Wireless Controls
  • Electronic Fuel Injection
  • Oil Cooled
  • Heavy-Duty Construction Throughout
  • Unique Double Helix Flail Rotor
  • Large Diameter Tyres For Smooth Travel
  • Strenx® high performance steel deck
  • Forged Hammer Flails

Industry Leading Performance

The FM PRO utilises an industry-leading Fuel Injected 25hp Honda iGX800 V-Twin Engine, which offers unparalleled power and performance in its class. Complete with electric start as standard, this Mower is easy to use for anyone.

Available in 1.2 m (4’) and 1.5 m (5’) cutting widths, it’s built to perform year after year, leaving a clean, professional finish every time.

Strength, Reliability & Smooth Operation

At the heart of the FM Pro is a precisely balanced, reinforced 360 mm rotor, engineered for smooth, uninterrupted cutting even in the most challenging conditions. The Strenx® steel deck increases structural rigidity while reducing weight, making the mower stronger, easier to tow, and more efficient in operation.

A powerful 25 hp Honda V-Twin engine, paired with a larger fuel tank and high-capacity battery, ensures extended runtime and consistently reliable starting performance.

Efficiency & Operator Flexibility

Large flotation tyres can be positioned alongside the cutting deck for convenient towing or trailing behind for close-edge work up to fences, trees, and boundaries.

The redesigned axle system allows operators to switch between positions in under two minutes, maximising manoeuvrability and operational efficiency.

SmartCut Wireless Controls

The FM Pro now features the industry-first SmartCut wireless control box, allowing operators to start the engine and engage the cutting system remotely from the towing vehicle.

The system provides real-time monitoring of key parameters including engine temperature, fuel consumption, and service intervals, offering complete operational control, improved reliability, and preventative maintenance support — all without trailing cables or complex wiring.

Heavy-Duty Construction for Maximum Longevity

Built using premium Strenx® high-tensile steel, the FM Pro’s cutting deck and rotor deliver up to three times the strength of previous models while reducing overall machine weight.

The double flyweight clutch ensures smooth, reliable drive engagement, and reinforced components throughout the machine provide unmatched durability and long-term performance.

Precision Cutting & Maximum Performance

The rotor is paired with heavy-duty forged hammer flails, designed to pivot rearwards on impact with hidden obstacles, protecting the rotor while maintaining a clean, precise cut.

Refined rotor design ensures maximum power transfer from the engine, providing superior cutting across dense vegetation, long grass, and challenging terrain.

Excellent bit of kit, great service, great value for money, highly recommend 🙂

Mark TApril 2021

Fantastic machine. I use the flail to cut horse paddocks and the local rugby club pitch both situations it does a fantastic job. Great service back up from Chapman. Great to support a British manufacture.

Nick WiltshireSeptember 2017

It started first turn of the key and cut perfectly for an hour and a half. This machine is a credit to your company and everyone who works there, the high quality, workmanship, and finish of the unit, and your professionalism throughout my purchase has made the whole transaction a dream so thanks to you and your entire team.

KevanApril 2017

First class, good cut on long and medium grass length.

Brian JonesAugust 2023

Very helpful. Quick delivery and well packaged.

BarryApril 2024

The strength and size of the mulcher was absolutely amazing, we quickly made the purchase there and then!!! Since then, we have been out mulching everyday with it and all I can say is, WOW, this machine is bulletproof!

Darren MooreSeptember 2021

I can’t fault the machine for build quality and strength – it powered through the highest of rushes and left the paddock spotless. When coming over a big clump of rush all you have to do is slow down and give it a chance and it mulches right through it. I would highly recommend this machine to anyone and the extra money spent compared with the other brands is more than worth it for a quality machine.

PadraicAugust 2016

Recommended. Nice heavy-duty flail. Worth the extra cost v Chinese cheaper flails. With proper adjustment of cutting height tackles quite long grass, thistle and bramble on steep ground. Engine starts first time with the key, better than endless cranking. Self-adjusting belts useful. Used with alpine tractor rather than ATV. 5 stars out of 5.

Peter WDecember 2024

Well made piece of kit will be used behind an Alpine tractor. Quite heavy; smaller quads may struggle. Price competitive, delivery direct from Chapman. Easy transaction.

PeterFebruary 2024

Excellent flail mower. Well built, good powerful Honda engine, easy to use and had no trouble going through 4-5ft deep weeds/nettles. Pleased and would recommend.

Andrew SpinkJuly 2017

I would only buy a UK made machine as the Chinese alternatives just don’t have the grunt nor the build quality and I have not been disappointed. Fantastic piece of kit and I would recommend this to anyone. Thanks Chapman!!

Perry RiglerJuly 2016

Bought FM-150 with hammer head flails almost two years ago.
Total workhorse of a machine.
Not a moments issue.
Have clocked up 90 hours on it,

Would look to chapman again for any equipment based on the strength and design that's in this mulcher.

James KerrNovember 2025

Had the FM120 flail topper on the quad a few years now. With its low profile it is an excellent machine with its heavy duty flails tackles brambles ,reeds and rough grass easily.. Plenty of adjustment for height and the Honda engine is very reliable.

Malcolm LawrenceNovember 2025

We bought the FM150 Pro flail in 2023 through Frank Nicol distributer. Faultless construction and service. The flail is amazing - very powerful and goes through almost anything, only getting bogged down in the most dense grass. We have the mulching bar installed which does work well. Two small improvements would be heavier duty jockey wheel (ours failed early on) and some protection on the winding handle as this slowly chips the paint off the barrel.

Luke NorrisNovember 2025

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Options

Front Breaker Bar

Tubular fender bar to protect wheels and feed tall material (eg. bracken, reeds) into the mower smoothly

Build & Order

Cutter Bar

Fixed cutter bar within the deck to increase mulching and reduce chop size, for faster cut material de-composition.

Build & Order

Twin Bogie Axle

Replaces standard axle assembly with rocking beam axle with two wheels (per side), for smoother travel over rough terrain. Can only be used with the wheels to the side, cannot be used with wheels trailing.

Build & Order

Forged Hammer Flails

Fitted as standard on the FM PRO range, the forged hammer flails are considerably heavier, harder and give a better finish when cutting tough material eg. reeds, bracken. Higher rotational mass improves mower performance when encountering heavy clumps of material.

Build & Order

Specification

Weight310kg
Cutting Width1.2m
Cutting Height25-225mm
Rotor RPM2400rpm
Deck Steel Thickness5mm cover, 8mm side plates
Number of Hammer Flails22
Engine Power25hp Honda iGX800 EFI V Twin w/ Electric start
Tyre Size22x11x8″
Fuel Tank Capacity10 Litre
Belt Size2 x BX41 Cogged Belts w/ automatic tensioning system
Rotor BalancingG6.3 Dynamic balanced
Weight325kg
Cutting Width1.5m
Cutting Height25-225mm
Rotor RPM2400rpm
Deck Steel Thickness5mm cover, 8mm side plates
Number of Hammer Flails26
Engine Power25hp Honda iGX800 EFI V Twin w/ Electric start
Tyre Size22x11x8″
Fuel Tank Capacity10 Litre
Belt Size2 x BX41 Cogged Belts w/ automatic tensioning system
Rotor BalancingG6.3 Dynamic balanced

Literature

FM Series ManualDownload
FM120 Pro Parts DrawingDownload
FM150 Pro Parts DrawingDownload

Dimensions

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Excellent bit of kit, great service, great value for money, highly recommend 🙂

Mark TApril 2021

Fantastic machine. I use the flail to cut horse paddocks and the local rugby club pitch both situations it does a fantastic job. Great service back up from Chapman. Great to support a British manufacture.

Nick WiltshireSeptember 2017

It started first turn of the key and cut perfectly for an hour and a half. This machine is a credit to your company and everyone who works there, the high quality, workmanship, and finish of the unit, and your professionalism throughout my purchase has made the whole transaction a dream so thanks to you and your entire team.

KevanApril 2017

Very helpful. Quick delivery and well packaged.

BarryApril 2024

First class, good cut on long and medium grass length.

Brian JonesAugust 2023

The strength and size of the mulcher was absolutely amazing, we quickly made the purchase there and then!!! Since then, we have been out mulching everyday with it and all I can say is, WOW, this machine is bulletproof!

Darren MooreSeptember 2021

I can’t fault the machine for build quality and strength – it powered through the highest of rushes and left the paddock spotless. When coming over a big clump of rush all you have to do is slow down and give it a chance and it mulches right through it. I would highly recommend this machine to anyone and the extra money spent compared with the other brands is more than worth it for a quality machine.

PadraicAugust 2016

Recommended. Nice heavy-duty flail. Worth the extra cost v Chinese cheaper flails. With proper adjustment of cutting height tackles quite long grass, thistle and bramble on steep ground. Engine starts first time with the key, better than endless cranking. Self-adjusting belts useful. Used with alpine tractor rather than ATV. 5 stars out of 5.

Peter WDecember 2024

Well made piece of kit will be used behind an Alpine tractor. Quite heavy; smaller quads may struggle. Price competitive, delivery direct from Chapman. Easy transaction.

PeterFebruary 2024

Excellent flail mower. Well built, good powerful Honda engine, easy to use and had no trouble going through 4-5ft deep weeds/nettles. Pleased and would recommend.

Andrew SpinkJuly 2017

I would only buy a UK made machine as the Chinese alternatives just don’t have the grunt nor the build quality and I have not been disappointed. Fantastic piece of kit and I would recommend this to anyone. Thanks Chapman!!

Perry RiglerJuly 2016

Chapman machinery is faultless.
From our experience, don't waste your money trying to save a few quid unless you are happy to spend the difference on endless repairs, lost time and stress. Pay just a little extra and get proper quality British designed/made.
Over the moon with our FM120pro Flail mower purchased in May, been using it all summer on rough pasture/bracken/reeds/ uneven ground literally ploughs through with no effort.

TBOctober 2025

We bought a flail mower over a year ago - it is an amazing piece of kit. Initially bought to cut brambles and nettles back, but now also use it to cut grass with hammer teeth achieveing an almost lawn mowed finish. It is well built - obviously designed by someone who uses one - great Honda engine with seperate fuel tank which is great as other makes have an integral fuel tank above the engine which causes problems of fuel seepage into the sump (and for a friend this caused the engine to blow apart). It can also be mounted with an angled draw bar to offset cut. Adjusting the height of cut is really easy. We have the mulching bar attachment which works well.

Philip BOctober 2025

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