[DeTomaso] NPC and you think we have tire problems
Larry - Ohio Time
Larry at ohiotimecorp.com
Tue Apr 7 14:29:04 EDT 2015
If the Bloodhound <http://www.gizmag.com/bloodhound-rocket-test/35133/>
Supersonic Car (SSC) team makes good in its attempt to break the land speed
record, the car will be traveling at 1,000 mph (1,609 km/h). At such speeds,
the wheels will be spinning so fast that hitting even the smallest pebble
could be catastrophic. To protect both the car and the driver, the designers
of Bloodhound have had to come up with some high-tech answers to building
the wheels and protecting against their failure.
*
<http://www.gizmag.com/bloodhound-supersonic-wheels/36550/pictures>
Blasting across salt flats at beyond the speed of sound takes more than
engines punching out insane amounts of power. It also requires wheels that
can withstand stress than make an F1 race car look like a kiddie wagon.
Built by a consortium of companies, the wheels of the Bloodhound have to
support 7.5 tonnes (8.2 tons) just standing still, so its no wonder that
each 90 cm (35.4 in) wheel disk weighs 91 kg (200 lb).
But it's when Bloodhound makes its run that the problems really begin. At
top speed, the wheels will be turning at 10,200 rpm - and even this is an
approximation because the Bloodhound is expected to outpace the wheels, so
it isn't certain how fast the wheel will actually be turning at top speed.
When going flat out, the wheels generate 50,000 radial g at the rim, which
means that a 1 kg (2.2 lb) bag of sugar set on the rim would weigh 50 tonnes
(55 tons) or as much as a juggernaut lorry.
<http://www.gizmag.com/bloodhound-supersonic-wheels/36550/pictures#10>
Inspecting a wheel of the Bloodhound
To handle that sort of stress, the wheel discs are made of a special
aluminum alloy created for cutting-edge aerospace applications called 7037,
which includes traces of zinc, copper, and manganese. This is forged into a
"cheese" in a 3,600 tonne (4,000 ton) hot press and a 20,000 tonne (22,000
ton) cold press with a high degree of precision to make sure that each wheel
is perfectly balanced.
According to Bloodhound SSC, the purpose of all this heating and squashing
is to press the crystalline structure of the aluminum to remove any voids
and form a stronger, more compact matrix that has a radial pattern like the
spokes of a wheel.
However, such strengthening, followed by precision machining by the Castle
company and testing by Rolls Royce, has its limits and should the ground
crew overlook a single stone or the car kick one up from beneath the desert
floor, the results could be catastrophic. A foreign object hitting the wheel
could cause to lose its balance, which would quickly damage bearings and
increase the wobble until the wheel tore itself apart in a manner normally
only seen in an exploding jet turbine.
Another danger is that the front wheel could fire a pebble at the rear wheel
or into the body of the car at supersonic speeds. This could be extremely
dangerous for the driver Andy Green despite the carbon composite cockpit. To
protect against this, Morgan Advanced Materials is developing lightweight
composite ballistic panels to guard the cockpit and other vital areas.
These panels are slightly curved to fit the cockpit and other points, but
this has the additional advantage of providing a surface for flying objects
to strike at an angle rather than dead on. The panels are made out of
millions of woven glass fibers that act as energy absorbers. They work not
by stopping the projectile, but by dissipating the energy. According to
Morgan, as the projectile hits, it tears the fibers. Each tear takes energy
and as the projectile rips through the laminated mats, it loses a lot of
energy and minimizing damage.
Morgan has been subjecting the glass fiber mats to tests involving a gun
designed to produce the force of a cricket ball traveling at 2,000 mph
(3,218 km/h). The company fired metal sabots that simulate the largest piece
that could come off the wheels prior to a total failure, and results so far
have been positive. The test panels look as though they've been attacked by
a buzz saw, but they manage to adequately decelerate the projectile.
If all goes according to schedule, the Bloodhound will make its attempted
record run next year in South Africa using its triple power plant of a
hybrid rocket motor, F1 racing engine, and the jet engine from a Typhoon
fighter.
The video below shows the composite ballistic panels being tested.
Larry - Cleveland
-------------- next part --------------
If the [1]Bloodhound Supersonic Car (SSC) team makes good in its
attempt to break the land speed record, the car will be traveling at
1,000 mph (1,609 km/h). At such speeds, the wheels will be spinning so
fast that hitting even the smallest pebble could be catastrophic. To
protect both the car and the driver, the designers of Bloodhound have
had to come up with some high-tech answers to building the wheels and
protecting against their failure.
.
Blasting across salt flats at beyond the speed of sound takes more than
engines punching out insane amounts of power. It also requires wheels
that can withstand stress than make an F1 race car look like a kiddie
wagon. Built by a consortium of companies, the wheels of the Bloodhound
have to support 7.5 tonnes (8.2 tons) just standing still, so its no
wonder that each 90 cm (35.4 in) wheel disk weighs 91 kg (200 lb).
But it's when Bloodhound makes its run that the problems really begin.
At top speed, the wheels will be turning at 10,200 rpm - and even this
is an approximation because the Bloodhound is expected to outpace the
wheels, so it isn't certain how fast the wheel will actually be turning
at top speed. When going flat out, the wheels generate 50,000 radial g
at the rim, which means that a 1 kg (2.2 lb) bag of sugar set on the
rim would weigh 50 tonnes (55 tons) or as much as a juggernaut lorry.
[2]Inspecting a wheel of the Bloodhound
To handle that sort of stress, the wheel discs are made of a special
aluminum alloy created for cutting-edge aerospace applications called
7037, which includes traces of zinc, copper, and manganese. This is
forged into a "cheese" in a 3,600 tonne (4,000 ton) hot press and a
20,000 tonne (22,000 ton) cold press with a high degree of precision to
make sure that each wheel is perfectly balanced.
According to Bloodhound SSC, the purpose of all this heating and
squashing is to press the crystalline structure of the aluminum to
remove any voids and form a stronger, more compact matrix that has a
radial pattern like the spokes of a wheel.
However, such strengthening, followed by precision machining by the
Castle company and testing by Rolls Royce, has its limits and should
the ground crew overlook a single stone or the car kick one up from
beneath the desert floor, the results could be catastrophic. A foreign
object hitting the wheel could cause to lose its balance, which would
quickly damage bearings and increase the wobble until the wheel tore
itself apart in a manner normally only seen in an exploding jet
turbine.
Another danger is that the front wheel could fire a pebble at the rear
wheel or into the body of the car at supersonic speeds. This could be
extremely dangerous for the driver Andy Green despite the carbon
composite cockpit. To protect against this, Morgan Advanced Materials
is developing lightweight composite ballistic panels to guard the
cockpit and other vital areas.
These panels are slightly curved to fit the cockpit and other points,
but this has the additional advantage of providing a surface for flying
objects to strike at an angle rather than dead on. The panels are made
out of millions of woven glass fibers that act as energy absorbers.
They work not by stopping the projectile, but by dissipating the
energy. According to Morgan, as the projectile hits, it tears the
fibers. Each tear takes energy and as the projectile rips through the
laminated mats, it loses a lot of energy and minimizing damage.
Morgan has been subjecting the glass fiber mats to tests involving a
gun designed to produce the force of a cricket ball traveling at 2,000
mph (3,218 km/h). The company fired metal sabots that simulate the
largest piece that could come off the wheels prior to a total failure,
and results so far have been positive. The test panels look as though
they've been attacked by a buzz saw, but they manage to adequately
decelerate the projectile.
If all goes according to schedule, the Bloodhound will make its
attempted record run next year in South Africa using its triple power
plant of a hybrid rocket motor, F1 racing engine, and the jet engine
from a Typhoon fighter.
The video below shows the composite ballistic panels being tested.
Larry - Cleveland
References
Visible links
1. http://www.gizmag.com/bloodhound-rocket-test/35133/
2. http://www.gizmag.com/bloodhound-supersonic-wheels/36550/pictures#10
Hidden links:
3. http://www.gizmag.com/bloodhound-supersonic-wheels/36550/pictures
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