Aberlink Accuracy Assists Bloodhound SSC Land Speed Record Attempt
The targets for the advanced Bloodhound SSC project are
a simple yet astonishing, to set a new land speed record and if
possible to achieve an amazing 1000mph. To accomplish these incredible
goals, the F.I.A procedures dictate that Bloodhound must complete two
runs in opposite directions within one hour, with the average speed of
the two runs regarded as the speed achieved. At 15 deg. Centigrade,
typical of the temperatures experience while record breaking, the sonic
velocity is 761.2 mph. If Bloodhound achieves its ambitious 1000mph
target, the car will have exceeded speeds of 1.3 times the speed of
if any of the enduring world record attempts capture the public's
imagination in the way that the motorsport land speed record does. Even
to the most casual observer, the combination of the most up to date
technology and the bravery of a driver, triumphing over the fundamental
elements of distance and time, seems to embody humankind's indomitable
spirit and relentless pursuit of progress.
tradition began as a battle between different types of propulsion.
First electricity and then steam struggled for supremacy, after that
came the era of the internal combustion engine. This was superseded by
its much more powerful aeronautical counterpart, that too, was consigned
to the pages of history by today's turbojet and rocket engines. It was
this advanced technology that propelled, Thrust SSC, driven by Andy Green,
to a remarkable 763.035 mph on October 15th 1997, resulting in Green
becoming the first man to exceed the speed of sound at ground level.
Andy Green remains the only man to have traveled at supersonic speed in a
land based vehicle.
the continuing, inspiring spirit of the tradition, the ambitious new
target for the Bloodhound SSC is an amazing 1,000 mph, this objective
represents an increase on the current mark of 31% To achieve this
challenging goal, the project team have chosen a jet and hybrid rocket
propulsion combination. The rocket will deliver the raw power required,
without the drag that results from an air intake. Although, the
disadvantage of the use of a rocket is that it is an on/off device. By
using rocket power alone, the team would have great difficulty hitting
and holding the selected Mach velocity that would allow the team's
aerodynamicists to gain their important data. Also, at these extreme
speeds, Mach numbers need to be raised in small, incremental steps. To
accomplish the all important control over power, the impressive Eurojet
EJ200 is used. Compared to its impressive power output, the advanced
Typhoon engine is incredibly small and light, and by throttling the jet,
full control over the output of the combination of rocket and jet is
in the middle of the Bloodhound SSC is an 800 bhp, Formula 1 race
engine which acts as an APU, delivering hydraulic power for starting the
EJ200 and for pumping the High Test Peroxide (HTP) through to the
Falcon rocket. As with all other aspects of the ambitious project, the
numbers associated with this pumping system are extremely impressive, it
is designed to move a ton of HTP through to the rocket catalyst in just
22 seconds, at a pressure of 1200 psi.
shape of the Bloodhound SSC is completely different to any vehicle that
has preceded it. The cross-sectional area is minimised to reduce drag,
whilst it features a supersonic intake and a smart suspension system
that will enable the car to run smoothly over rough salt surfaces. As
the rocket is positioned above the EJ200, raising the centre of gravity,
for stability the rear wheels are located on outrigged struts.
Previously this configuration was seen as a huge aerodynamic
disadvantage, although today, running computational fluid dynamics (CFD)
with multi-million elements, the team are able to compute the drag of
the wheels and struts at Mach 1.4 and optimise the shape to negate the
affects of drag.
radical, technical nature of the Bloodhound SSC project has been made
possible by the undoubted expertise of the team's engineers, and the
considerable assistance and cooperation of both UK academia and
industry. The high-precision requirements of the venture means that an
absolute engineering prerequisite is the ability to undertake extremely
accurate measurements at each stage of development and manufacture.
Having carefully considered the alternative technologies, an advanced Axiom too Coordinate Measuring Machine from
Aberlink Innovative Metrology, was chosen as the high-precision
workhorse of the project. Bloodhound SSC Engineer, Conor La Grue
explained. "Now in constant use, our Aberlink CMM has proven to be very
easy to use. Following a short learning curve, each of our technicians
are now able to undertake extremely complex measuring routines and
achieve very accurate results extremely quickly. In addition to the
machine's impressive hardware, Aberlink's software is proving to be both
comprehensive in its scope and very easy to use, a common operation
being inputting data and checking against models."
the mechanical failure of any of the constituent parts of the
Bloodhound SSC could have severe consequences, we carry out meticulous
dimensional checks on all components, keeping painstaking records of all
of our measured data. The Axiom too CMM is making a significant
contribution to our precise measurement and data capture efforts, and to
the overall progress of the Bloodhound SSC project."
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