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cathouse willy
12-18-2009, 09:28 PM
Not sure how accurate this is but it makes good reading



DEFINITION OF ACCELERATION
One top fuel dragster 500 cubic inch Hemi engine makes more horsepower than the first 4 rows of stock cars at the Daytona 500.

It takes just 15/100ths of a second for all 8000+ horsepower of an NHRA Top Fuel dragster engine to reach the rear wheels.

Under full throttle, a dragster engine consumes 1-1/2 gallons of nitromethane per second; a fully loaded 747 consumes jet fuel at the same rate with 25% less energy being produced. (note: Nitro M weights 10# per gal vs about 6# for gasoline)

A stock Z06 V8 engine cannot produce enough power to drive the dragster's supercharger.

With 3,000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into a near-solid form before ignition......Cylinders run on the verge of hydraulic lock at full throttle.

At the stoichiometric (stoichiometry: methodology and technology by which quantities of reactants and products in chemical reactions are determined) 1.7:1 air/fuel mixture of nitro methane, the flame front temperature measures 7,050 deg F.

Nitro methane burns yellow... The spectacular white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapor by the searing exhaust gases.

Dual magnetos supply 44 amps to each spark plug. This is the output of an arc welder in each cylinder.

Spark plug electrodes are totally consumed during a pass. After halfway, the engine is dieseling from compression, plus the glow of exhaust valves at 1,400 deg F. The engine can only be shut down by cutting the fuel flow..

If spark momentarily fails early in the run, unburned nitro builds up in the affected cylinders and then explodes with sufficient force to blow cylinder heads off the block in pieces or split the block in half.

In order to exceed 300 mph in 4. 5 seconds, dragsters must accelerate an average of over 4G's. In order to reach 200 mph (well before half-track), the launch acceleration approaches 8G's.

Dragsters reach over 300 miles per hour before you have completed reading this sentence.

Top fuel engines turn approximately 540 revolutions from light to light! Including the burnout, the engine must only survive 900 revolutions under load.

The redline is actually quite high at 9,500 rpm.

Assuming all the equipment is paid off, the crew worked for free, and for once NOTHING BLOWS UP, each run costs an estimate $1,000.00 per second. That is $60,000 per minute. That is $3,600,000 dollars per hour.

The current top fuel dragster elapsed time record is 4.428 seconds for the quarter mile (11/12/06, Tony Schumacher, at Pomona , CA ).. The top speed record is 336.15 mph as measured over the last 66' of the run (05/25/05 Tony Schumacher, at Hebron , OH ).

Putting all of this into perspective:
If you are driving the average $140,000 Lingenfelter 'twin-turbo' powered Corvette Z06. Over a mile up the road, a top fuel dragster is staged and ready to launch down a quarter mile strip as you pass. You have the advantage of a flying start. You run the 'Vette hard up through the gears and blast across the starting line and pass the dragster at an honest 200 mph. The 'tree' goes green for both of you at that moment. The dragster launches and starts after you. You keep your foot down hard, but you hear an incredibly brutal whine that sears your eardrums and within 3 seconds, the dragster catches and passes you. He beats you to the finish line, a quarter mile away from where you just passed him. Think about it, from a standing start, the dragster had spotted you 200 mph and not only caught, but nearly blasted you off the road when he passed you within a mere 1,320 foot long race course.

and that my friend, is ACCELERATION ...







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Paul Pless
12-18-2009, 09:32 PM
some truth... a lot of untruth

Nanoose
12-18-2009, 09:46 PM
just once would be nice

davidagage
12-18-2009, 09:51 PM
But can ya take it to the grocery store..

The Ultima, for under $100K
ULTIMA GTR720 PERFORMANCE STATS (http://www.ultimasports.co.uk/Content.aspx?f=records)

0-100-0 in 9.4 seconds


0-60mph 2.6secs
World Record 0-100mph 5.3secs
World Record 30-70mph 1.8secs
World Record 0-100mph-0 9.4secs
World Record 100mph-0 3.6secs
World Record Standing mile 9.9secs @143mph Top Speed 231mph (gearing limited) Skidpad (200ft) 1.176g World Record

paladin
12-18-2009, 10:15 PM
In 1958 I built a machine, and we ran it at Fort Sill, Oklahoma...1st quarter mile time was under 2 seconds, and top speed was more than 500 mph,
Second run.....quarter mile in 1.69 seconds, top speed 586..............

seanz
12-19-2009, 01:30 AM
I think one of those was on the news here in NZ just recently.
:)


Top Fuel is impressive to watch but I'd really have liked to see one of these go through its paces.....
http://en.wikipedia.org/wiki/Saturn_V

Dan McCosh
12-19-2009, 06:24 PM
Neat stuff. One that he missed was that after a quarter mile, a top-fuel dragster is traveling about 80 mph slower than the fastest speed ever achieved by a wheel-driven car--regardless of how long it accelerates.

Krunch
12-19-2009, 06:32 PM
In 1958 I built a machine, and we ran it at Fort Sill, Oklahoma...1st quarter mile time was under 2 seconds, and top speed was more than 500 mph,
Second run.....quarter mile in 1.69 seconds, top speed 586..............

JATO rocket bolted to a skateboard?

hokiefan
12-19-2009, 06:44 PM
The other thing he missed was that at 200 mph in the Vette it takes 4.5 seconds to go 1/4 mile. So the dragster doesn't blow the Vette away, they cross the line as a tie. Still pretty impressive, but not blown away.:D

Cheers,

Bobby

D=V*T (for constant speed)
T=D/V
T=(0.25 mile)/(200 mph)=0.00125 hours
T=(0.00125 hours)*(3600 sec/hour)
T=4.5 sec

BrianW
12-19-2009, 07:58 PM
In 1958 I built a machine, and we ran it at Fort Sill, Oklahoma...1st quarter mile time was under 2 seconds, and top speed was more than 500 mph,
Second run.....quarter mile in 1.69 seconds, top speed 586..............

I've heard that story...


The operator was driving a 1967 Chevy Impala. He ignited the JATO unit approximately 3.9 miles from the crash site. This was established by the location of a prominently scorched and melted strip of asphalt. The vehicle quickly reached a speed of between 250 and 300 mph and continued at that speed, under full power, for an additional 20-25 seconds. The soon-to-be pilot experienced G-forces usually reserved for dog-fighting F-14 jocks under full afterburners.

The Chevy remained on the straight highway for approximately 2.6 miles (15-20 seconds) before the driver applied the brakes, completely melting them, blowing the tires, and leaving thick rubber marks on the road surface. The vehicle then became airborne for an additional 1.3 miles, impacted the cliff face at a height of 125 feet, and left a blackened crater 3 feet deep in the rock.

Most of the driver's remains were not recovered; however, small fragments of bone, teeth, and hair were extracted from the crater, and fingernail and bone shards were removed from a piece of debris believed to be a portion of the steering wheel.

...except there was no second run.

Snopes said it was false, but now we know the truth.

paladin
12-19-2009, 09:56 PM
JATO rocket bolted to a skateboard?

Home made rocket, it was 6 feet long....lotsa jokes, it'll never work......the estimated speed as it left the end of the 14 foot launch rail was in excess of 500 mph...from a standing start...neat motor...was based on Dr. Goddards motor, made in the school shop from reject materials....won the science award in High School, paid for first year univ.

JimD
12-20-2009, 09:42 AM
and that my friend, is ACCELERATION ...

That, my friend, is nothing. And only overgrown adolescents waste anytime thinking about it.

Krunch
12-20-2009, 11:03 AM
Home made rocket, it was 6 feet long....lotsa jokes, it'll never work......the estimated speed as it left the end of the 14 foot launch rail was in excess of 500 mph...from a standing start...neat motor...was based on Dr. Goddards motor, made in the school shop from reject materials....won the science award in High School, paid for first year univ.

Neat! Any pics?

gert
12-20-2009, 12:25 PM
That, my friend, is nothing. And only overgrown adolescents waste anytime thinking about it.

:confused::confused::confused:

Your purpose sir?

paladin
12-20-2009, 12:51 PM
Nothing to take a picture of...it was 1958....I delivered it to the school......they wouldn't let us launch them,,,there were a half dozen of us....the school made arrangements with the missile crew at Fort Sill....and all was expected were a few fizzles....only one fizzled......one went up about 20 feet, turned over, and went full speed about three feet above the ground, through the parking lot and 3 cars before it stopped.....mine was the only liquid fuel. They were afraid of a BIG explosion so I was only allowed one gallon of fuel as opposed the the 4 that I wanted.....we had to stay at the blockhouse while the military guys set them up, we got to push the switch to fire, and that was the closest they would let us get to our WMD. Pretty good for 50 years ago...