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“Extreme power and fuel efficiency”

The FM PRO enters new territory in the ATV flail mower market for extreme power and reliability while maintaining better fuel efficiency versus traditional carburettor models.

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

  • Powerful 25hp Honda Petrol Engine
  • Electronic Fuel Injection
  • Oil Cooled
  • Heavy duty construction throughout
  • Unique double helix flail rotor
  • Large diameter tyres for smooth travel
  • Automatic belt tension system
  • Forged Hammer Flails

Industry Leading Performance

The FM PRO utilises industry-leading Fuel Injected 25hp Honda Fuel Injected iGX800 V-Twin Engines, which offer unparalleled power and performance in their class.

The FM PRO models are fitted with forged hammer flails as standard, proven to cope with the most demanding growth, with a cleaner, more reliable cut.

When reliability meets intelligence

The Honda iGX800 offers excellent fuel efficiency due to the electronic control system which continually monitors and adjusts the engine’s air to fuel ratio according to operating conditions and engine load while maintaining optimal performance.

This results in excellent fuel efficiency and low emissions – so good, that in product trials the fuel efficiency was typically 10-12% better than the previous model.

Lower fuel consumption & better efficiency

The FM PRO is paired alongside with Honda’s legendary quality and reliability, the upgraded engines minimise starting issues in a range of conditions and are less susceptible to poor quality fuel, making them even more efficient.

This means lower fuel consumption, less maintenance costs and less downtime – important factors when choosing which machine is right for you making it perfect for commercial and heavy duty users.

FM Pro Series

Heavy duty & Robust

The FM PRO range are fitted as standard with a centrifugal clutch, allowing for safe & efficient operation from the towing machine.

The centrifugal clutch gives automatic drive engagement and disengagement, and combined with the automatic tensioning assembly reduces maintenance by compensating for belt wear and belt loading. Heavy-duty ‘bx’ type drive belts last longer and are more efficient than smaller units used on competing machines.

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

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Options

Front Break 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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