Guy Dixon

JCB Fastrac Two '10.2019

Auteur : Guy Dixon

In October 2019, "Fastrac Two" hit an astonishing peak speed of 153.771mph on its way to recording an average of 135.191mph at Elvington.

The record-breaking attempt was overseen by Guinness World Records, who confirmed that the JCB Fastrac completed two runs, in either direction through a speed trap set 1km apart, within the allotted time, to set the 135.191mph record.

Fastrac Two maintained the same design principles and packaging, but would be 10% lighter than its predecessor (Fastrac One), reducing its weight to less than five tonnes. The tractor’s bonnet was changed from steel to aluminium; non-structural material was removed from the chassis, while the cab and roll cage mounts would be incorporated into the chassis design.

Streamlined bodywork also had a role to play, with aerodynamic analysis and development conducted by Rob Smedley, ex-Williams head of vehicle performance, and computational fluid dynamics (CFD) used by Williams Advanced Engineering, to give Fastrac Two a 10% reduction in drag over Fastrac One.

This saw the development of new cab air deflectors, a new rear cover, re-designed radiator covers, new side panels, front bumper and cab roof, would also help the tractor to cut through the air, on its way to the new Guinness World Record.

An extra shot of power was needed, and the 7.2 litre, 6-cylinder JCB Dieselmax engine produced at JCB Power Systems in Derbyshire, also received some extra attention. A new, larger turbocharger was accompanied by water injection and charge-air cooling through ice tanks, reduced intake temperatures by 50˚C.

An electrically driven supercharger system was again used, while a revised exhaust manifold contributed to improved flow. The adoption of a sophisticated anti-lag system would also keep the larger turbocharger delivering its maximum boost pressure while gear changes took place. The result of the powertain improvements was a peak output of 1,016hp at 3,150rpm, and over 2,500Nm of torque.

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  • Mise en ligne par : Wheels&Tracks , il y a 4 mois
  • Date prise: 18.10.2019
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il y a 4 mois
Wheels&Tracks

JCB FASTRAC STORMS INTO RECORD BOOKS!

JCB’s Fastrac has stormed into the record books after being crowned the world’s fastest tractor. Fastrac Two hit a peak speed of 153.771mph on its way to recording an average of 135.191mph

With Fastrac One achieving the British record earlier this year, Fastrac Two was engineered to achieve a world record-breaking speed.

Fastrac Two - designed and built by a team of young engineers in Staffordshire, secured the latest title at Elvington Airfield in York with motorbike racer and lorry mechanic, Guy Martin at the wheel.

The feat was officially ratified by Guinness World Records.

To secure the World’s fastest tractor (modified) record, JCB’s engineering team turned to the drawing board to produce the vastly-improved Fastrac Two.

Together, with newly acquired knowledge from breaking the world record weeks earlier with Fastrac One and the help of key industry partners, JCB developed the new Fastrac. Both tractors are based on a standard, commercially available Fastrac. Fastrac Two had more horsepower using JCB’s 7.2 litre, Dieselmax engine produced at the JCB Power Systems factory in Derbyshire. It was also 10% lighter and even more streamlined with improved aerodynamics, but still used over 50% of standard Fastrac parts.

Streamlined bodywork had a role to play, with aerodynamic analysis and development conducted by Williams Advanced Engineering with the help of Rob Smedley, ex-Williams head of vehicle performance, and computational fluid dynamics (CFD). A surface creation was also carried out by JCB’s Industrial Design Team. The results gave Fastrac Two a 10% reduction in drag over Fastrac One.

- We made the standard cab 200mm lower and 300mm narrower;

- The whole machine was made 200mm lower;

- New cab air deflectors were developed;

- A front splitter, belly plate and rear diffuser was added.

We Increased the power of the Fastrac’s 6 cylinder, 284hp engine by fitting a JCB 672 engine with over 1,016hp and over 2,500Nm of torque, creating the extra performance we needed.

- It has a hybrid boost system with a 350% increase in airflow, larger turbo and electrically driven supercharger;

- Water injection was used to cool combustion and aid piston cooling;

- We gave it a 230% increase in boost pressure and 165% increase in engine speed to 3,300rpm;

- A massive 2500 bar fuel pump, bigger inlet manifolds and an ice water charged air cooler were also added.

We needed to reduce the standard weight of a Fastrac from over 8.5t to around 5t; the equivalent of a mini and a range rover combined.

- It was made 3500kg lighter using aluminium panels instead of steel, GRP and carbon fibre bodywork;

- The chassis was lightened from 750kg to 480kg;

- We built a lighter suspension, used aluminium axle covers and removed the hub reduction gears;

- Lithium batteries were a lighter choice.

For maximum protection we had to design, manufacture and then get FIA approval for a roll cage on a vehicle that didn’t fit into any conventional FIA category.

We also had to fit several other important safety features:

- FIA approved roll cage tied into chassis;

- Double skinned racing fuel tank;

- Uprated advanced split-type air/hydraulic braking system;

- A parachute was added but not needed;

- FIA approved 6-point racing harness and seat.

It would have been easy to compromise and use components like aero tyres but that isn’t in our nature. We developed standard Fastrac tyres that are normally rated to 80 kph, approved to do 260 kph. Steel belts in tyres provided the high strength required at speed.

- Higher roundness uniformity gave less vibration problems at high speed;

- Lowered tread blocks gave higher lateral stability and reduced rolling resistance;

- A low heat generation compound provided optimised grip;

- Tyre sensors monitored heat and vibration in real-time;

- Standard Fastrac suspension and steering geometry coupled with optimised spring and damping rates, provided a precise, controllable ride.

The testing programme was extensive and rigorous with 5 months of engine and machine development including engine test rigs, virtual testing and Finite Element Analysis (FEA) on steel components. Nothing would be overlooked.

- Cooling system analysis;

- Clutch and key gear change developed to improve smoothness and speed;

- Rolling resistance measurements;

- Brake performance validation.

Both JCB’s record-breaking achievements took place at Elvington Airfield near York, England. The airfield was originally used by the RAF during WW2 and has a runway measuring 1.92 miles, one of the longest in Britain. Consequently, it has proved a popular location for speed tests and has a history of record-breaking attempts.

https://www.jcb.com/en-gb/campaigns/fastrac/wft

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