Author Topic: Definition of Accelleration  (Read 18802 times)

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Offline Mace

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Definition of Accelleration
« on: July 18, 2012, 04:55:16 PM »
Another email doing the rounds:

DEFINITION OF ACCELERATION
   
One top fuel dragster 500 cubic inch (approx 8.3 litres)  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 8,000+ 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 nitro methane per second; a fully loaded 747 consumes jet fuel at the same rate with 25% less energy being produced.

A stock Dodge Hemi 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.

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:

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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Offline gunna

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Re: Definition of Accelleration
« Reply #1 on: July 18, 2012, 05:41:26 PM »
What a brute
Full marks to the drivers of these machines for holding them straight
thanks for sharing Mace
 :cheers: sheeds

Offline wholehog

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Re: Definition of Accelleration
« Reply #2 on: July 18, 2012, 05:51:42 PM »
Must have witnessed more then 500 top fuel and top fuel funny car passes in my life time and i still get goosebumps when one of these babies fire up in anger....
Watch them from the start or in the traps(finishline) ..u can litterally feel the vibrations thru the ground as  close to 16000 horsepower(both cars)thunder past
this video shows the accelaration as the one in the left breaks something
Top Fuel Drag Racing with on board camera. Small | Large

one more........
496.72 km/h 3.899 sec 8000 hp Top fuel dragster Yas Marina Abu-Dhabi
« Last Edit: July 18, 2012, 06:00:27 PM by wholehog »

Offline wholehog

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Re: Definition of Accelleration
« Reply #3 on: July 18, 2012, 06:07:59 PM »
when these go KABOOM....they really go off...watch the drivers head go forward due to rapid deceleration
Tony Schumacher Chicago 2012 Engine Explosion!

Offline UTE 701

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Re: Definition of Accelleration
« Reply #4 on: July 18, 2012, 06:17:45 PM »
I can tell you , from someone who spent alot of time taking photos of these things from the wall and close behind , the sound shock-waves are such that you must lean into them and put one foot behind to brace yourself.

I've seen many a rookie photographer stand front on and flat footed , only to get knocked over on the launch .

And the fumes ... that's another story ... I'm guessing it's comparable to tear gas , as huge uncontrollable tears just pour down your face .

But ... It was awesome  !  :)

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Offline 1HDT

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Re: Definition of Accelleration
« Reply #5 on: July 18, 2012, 07:46:43 PM »
Thanks for sharing Mace.

Great to understand what's happening from a stats point of view.

 :cheers:

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Offline xcvator

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Re: Definition of Accelleration
« Reply #6 on: July 18, 2012, 08:02:25 PM »
Mace , do they come in 4wd and where do you put the tow hitch ? ;D
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Offline kiwipete

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Re: Definition of Accelleration
« Reply #7 on: July 18, 2012, 08:18:36 PM »
I have always wanted to go to see these run - maybe one day I will....
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Offline kiwipete

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Re: Definition of Accelleration
« Reply #8 on: July 18, 2012, 08:35:55 PM »
Years ago I use to Nav in a Jetsprint boat.. These Boats could go from 0-70mph in 2.5seconds and take a 90deg turn at 90mph..  and they were a 400ci cast iron small block, single carb..  That guy is still racing in Open Class now and has a Macraft boat 400+CI Supercharged running Methanol... 

Not as quick or with such mind blowing statistics as those Drag cars but at a starting price of $30,000 upwards to the open classes they are a lot of fun.. 

Wairarapa Jetsprints 2012

   
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Offline macca

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Re: Definition of Accelleration
« Reply #9 on: July 18, 2012, 08:41:49 PM »
Ute, how about the shockwave when they destroy themselves, it blows the whole crowd back a foot or so

This is a boat I was involved with back in the eighties, used to belong to a guy I worked for



Offline UTE 701

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Re: Definition of Accelleration
« Reply #10 on: July 18, 2012, 09:16:03 PM »
Wow , I always wanted to see some drag boat action ....

Yes I was always worried about a start line blow up , especially after one night when some sort of plug blew out the side of a TF engine and went all the way up to and through the window on the tower .....

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Offline MrHorsepower

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Re: Definition of Accelleration
« Reply #11 on: July 18, 2012, 09:18:01 PM »
Ute, how about the shockwave when they destroy themselves, it blows the whole crowd back a foot or so

This is a boat I was involved with back in the eighties, used to belong to a guy I worked for




I remember Tinker Toy  Macca, i used to frequent the boat drags at Windsor and Silverwater around that time + Hombre, the Pub Wyee, Fallacy and a few other awesome machines. A mate of mines dad owned Smoke on Water (Auto Gas Arrow) I love Top Fuellers but these boats were something else.

Offline macca

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Re: Definition of Accelleration
« Reply #12 on: July 18, 2012, 09:29:49 PM »
Spot on Mrhorsepower, sure was an awesome bit of kit, just something about an ARIAS, bloody shame the way it all ended

Offline toeball

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Re: Definition of Accelleration
« Reply #13 on: July 18, 2012, 09:38:46 PM »
Do yourself a favour, experience it live!!
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Offline shanegtr

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Re: Definition of Accelleration
« Reply #14 on: July 18, 2012, 10:17:50 PM »
I reckon its even more impressive to see what happens during a launch in slo mo
Mega Slow Motion (MegaMo) 1000 frames per sec. Dragsters Small | Large

Offline SteveandViv

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Re: Definition of Accelleration
« Reply #15 on: July 18, 2012, 11:02:11 PM »
Nice....
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Offline Black Diamond

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Re: Definition of Accelleration
« Reply #16 on: July 18, 2012, 11:05:57 PM »
Great read and facts too. Yes these things are awesome and to anyone who hasn't seen one in action go! ;D

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Offline shanegtr

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Re: Definition of Accelleration
« Reply #17 on: July 19, 2012, 12:41:45 AM »
not sure how true it is, but I've heard theres more astronouts alive then there are top fuel drivers

Found a cool video explaining a bit about top fuel (nightshift ;D)
How a Top Fuel Dragster Works
« Last Edit: July 19, 2012, 01:16:58 AM by shanegtr »

Offline wholehog

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Definition of Accelleration
« Reply #18 on: July 19, 2012, 05:45:24 AM »
Mate of mine used to drive " the pub wyee" drag boat.... Till it sank in jindabyne
The sainty"s also came across to cars from boating

Offline wholehog

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Definition of Accelleration
« Reply #19 on: July 19, 2012, 05:48:59 AM »
not sure how true it is, but I've heard theres more astronouts alive then there are top fuel drivers

Found a cool video explaining a bit about top fuel (nightshift ;D)
How a Top Fuel Dragster Works

You would be surprised how sage it actually is.... Very few deaths in the sport

Offline Footy Shorts Shane

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Re: Definition of Accelleration
« Reply #20 on: July 19, 2012, 06:46:52 AM »
That is a little sensationalised, but mostly true.
Couple of other facts, the fuel pump is capable of pumping around 40 gallons per minute.
Nitromethane is almost twice as heavy as water.
One rotation of the tyres, and the fuel car is at 60+ kph.
Don't quote me on these figures, as I can't remember the exact numbers, but the rear foil (wing) produces around 7000 lbs of downward pressure on the tyres. The headers (exhaust pipes) produce around 1000 lbs per side. When the header bolts shear, the headers fall off, (obviously) giving the car approx 1000 lbs down force to only 1 tyre, causing the car to turn 90 degs into the wall.
The green tinge in the header flame, just before the big bang of a blowup, is the copper head gasket burning up. When you see the green flame, before you can say anything, it will erupt into flames.

Fuel cars have only 1 gear. From a standing start to over 300 MPH in first gear.

Ignition timing is around 60 deg BTDC.

A fuel car engine does one pass, then it's ripped appart. Half a dozen guys/girls rip into it to get the pistons and rods out. The conrods are measured for length. They actually compress in length during the run due to cylinder pressure. The rod lengths is passed onto the Crew Chief, which helps to determine the tune for the next pass. They may add fuel to  some and remove it from other cylinders, going by the measurements of the conrods.

Most interesting fact though, Nitromethane tastes like Sambucca.

I have spent a little bit of time at the track and know one or two people there, and every driver of T/F I've spoken to, who has driven other race cars, (drag cars) have told me they are the easiest cars to drive. Go figure.

Shane.
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Offline Footy Shorts Shane

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Re: Definition of Accelleration
« Reply #21 on: July 19, 2012, 06:51:02 AM »
People say you can "feel" the cars go down the track. Watch this vid, and you can see what it is you're feeling......

Top Fuel Plastic Cup


Shane.
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Offline Footy Shorts Shane

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Re: Definition of Accelleration
« Reply #22 on: July 19, 2012, 06:57:41 AM »
A T/F fuel pump demonstration. This is one cylinder simulated here, remembering there's eight of them.....

NHRA top fuel pump demo Small | Large


Yes, I'm a drag racing junkie....

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Offline Mace

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Re: Definition of Accelleration
« Reply #23 on: July 19, 2012, 09:14:08 AM »
Some great stuff.

Ive only been to the drags once, to the Nationals at Calder Park many years ago.

I can only say that the night  was one of the best motor sport experiences Ive ever had.  Continuous action, great view, fantastic atmosphere.

if you get a chance, go.
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Re: Definition of Accelleration
« Reply #24 on: July 19, 2012, 09:39:45 AM »
I'm with you guys on this....been many times and you just cant get the same effect on TV as being there, so if you've ever been to see a Jet Car in action then you'l know what i mean when you see these things.  ;D

6,000 hp Jet Car Fires Up with Raw Sound


to "feel" the 'THUMPS' that hit you in the chest when these cars fire up and pre stage is just awesome
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