"Keith Willshaw" wrote:
"peter wezeman" wrote in message

Is the coefficient of friction of those special tires that high,
or do they use aerodynamic downforce to increase the traction?

Both.

If memory serves, the coefficient of friction of Formula One
racing tires is on the order of 1.2, but of course a drag slick doesn't
have to last nearly as long. One journalist wrote that, touching
a racing tire at operating temperature, it feels sticky, about like
wet bubble gum.


They sit at the start and deliberately induce wheelspin to get the tyres
good and hot, touch one of those tyres at racing temperature
and you'll get a 3rd degree burn

http://www.kagered-racing.com/images...02_burnout.jpg

Keith


The bottom line of automobile versus aircraft is that the piston
engined automobile is faster through the first, say, quarter, but the
advantage passes to the turbine-engined aircraft in the second
quarter.

It is a similar profile for turbine-engined drag cars versus
piston-engined drag cars and the turbine-engined cars have the
advantage over aircraft of being able to hold the engine on the
brakes.

I've seen photographs of

Cobra 427 versus F-15

Jaguar XJR-8 versus Jaguar

Don Garlits' Top-Fuel car versus F-14

I think this was 'staged', as Garlits did promotional work for the
Navy, including photo-shoot of him doing burn-out runs on the decks of
carriers. The photo-shoot with the F-14 was a problem as there was
nowhere suitable to get the two pieces of machinery together (the F-14
had to be launched from a catapult) I think Garlits had to do a run
on a section of concrete apron adjacent.

The photograph of the Jaguars showed both in the same frame with the
RAF version rotating. I am sure if I had read of a 'result' I would
have remembered.


Others events appear to have been::

Gilles Villeneuve in a Ferrari 126 CK beat an F-104 to 1000m circa
1981.

Tazio Nuvolari in an Alfa Romeo 8C 2300 lost to a Caproni Ca100 (85hp
De Haviland Gipsy 4 engine) circa 1931 in five laps of the Littorio
racetrack outside Rome.


Cat shots appear to take an F-14 to 150knots in approx two hundred and
fifty feet.

This place

http://www.globalsecurity.org/milita.../lakehurst.htm

has a catapult which can launch up to 185knots and also looks suitable
as a testing ground. So it looks like the first 300 feet will take you
to 185 knots in around two seconds.

The narrative on the Streak Eagle launch told of how the ground-roll
was comparable to a cat-shot and so it looks like the Streak Eagle is
the aircraft best adapted to carry the colours into battle.



Schumi versus Typhoon ended with Schumi beating the Typhoon in the
600m but losing out by 900m. The track was very wet which limited
traction for the Ferrari.

F2003-GA 600m=9.4s 900m=13.2s 1200m=16.7s
Typhoon 600m=9.6s 900m=13.0s 1200m=14.2s

The F2003-GA appears to have reached 294Kkm/h in the 600m and since
the car has a maximum speed of approx 369Km/h it was mostly spent at
this stage.


The F1 car weighs around 600Kg and must produce around 850HP which
would give around 1442HP/ton (not metric tonne).


Others :


Ferrari 550 Standing Mile: 30.9s 292HP/ton

Ferrari 575 Standing Km: 22s with 300HP/ton

McLaren F1 Standing Km: 19.6s with 560HP/ton

Ferrari 512M with 764HP/ton

Ferrari 712 Can-Am with 945HP/ton

Porsche 917/30 with 1796HP/ton

Top Fuel cars give approx 6250 HP/ton (six two five zero)

Drag cars such as Pro-Gas can run the standing half mile without much
adjustment, but I am not sure what it would take in final-drive
gearing, aerodynamics and limits on tyre rpm to get a Top Fuel car to
run a mile.

But my guess is Bid Daddy would clean house.