My friend and I were having a discussion about this and came up with some questions about it.  We tried to answer them, but I thought it'd be interesting to see what some other people thought.  I'll add my thoughts in later.  The assumption for most of the questions is that it can get to 400 mph.

http://www.allpar.com/cars/concepts/tomahawk.html

Stats:

Quote500 bhp (372 kW) @ 5600 rpm (60.4 bhp/liter); 525 lb.-ft. (712 Nm) @ 4200 rpm

Compression Ratio: 9.6:1
Max Engine Speed: 6000 rpm
Length: 102 inches
Width: 27.7 inches
Height: 36.9 inches
Wheelbase: 76 inches
Seat Height: 29 inches
Weight: 1,500 lbs.
Track, Front: 8.75 in
Track, Rear: 10 in
Weight Dist: 49F/51R
Ground Clearance: 3 in
Fuel: 3.25 gallons (!)

Front brakes:  20-inch perimeter-mounted drilled machined stainless steel rotors, one per wheel. Two four-piston fixed aluminum calipers per wheel (16 pistons total), custom designed. Blue anodized caliper finish. Hand-activated.

Rear Brakes:  20-inch perimeter-mounted drilled cast-iron rotors, one per wheel. One four-piston fixed aluminum caliper per wheel (8 pistons total), custom designed. Blue anodized caliper finish. Foot-activated.

Transmission:  Aluminum-cased two-speed, sequential racing-style with dog ring, straight-cut gears
Gear Ratios: 1st 18:38; 2nd 23:25    Front Sprockets: 14 teeth   Rear Sprockets: 35 teeth

Tires Mfr. and Model: Dunlop custom-made symmetrical
Size, Front (2): P120/60R-20
Size, Rear (2): P150/50R-20

Dual hub center type steering.
Steering Linkage: Rocker arm and push/pull rod with roller bearings. Polished billet aluminum steering yoke with turned aluminum grips and billet levers
Steering Lock: 20 degrees, left and right
Lean Angle: 45 degrees, left and right

The questions were:

1- How is the steering at 400 MPH?  Would it be twitchy, nearly impossible, not much different than normal?

2- With 3.25 gallons of gas, will that be enough to get up 400 mph?  how about 300 mph?

3- Say you hit a guard rail head on at 400 mph.  Beyond that is a huge cliff.  How far will you fly (horizontal distance)?

4- With a lack of fairings & windshield, will there be too much wind to hold on?

5- How capable are the brakes in stopping from such insane speeds?

6- How long would it take to get to 200, 300 & 400 mph?

7- What kind of MPG would you see at 400 mph?

This behemoth weighs 1500 lbs or 681 kg so it has about  0.73 power to weight ratio.

Hayabusa has about 0.8 ( will accelerate faster ) and better aerodynamics , which is the deciding factor here , so I can't imagine that thing going faster than the busa in the real world.

It will use it's power just to get up to speed and then hit aerodynamic barrier ,theoretic speed accounts for power and gearing only

BTW theoretical speed of GS in sixth gear is 140 mph ,but as speed increases so is air drag and for each additional 10mph you'll need 100 hp addition

( mph squared IIRC )

You're probably right.  But it's more fun to assume that it's capable of reaching 400 mph 

Yes it is ! 

It really looks like something out of a comics 

Just to correct myself , air drag increases as the square of speed and power increases as a cube of speed 

Now in english:  Drag increases exponentially with increase in speed.

Simpler yet ,to go twice as fast you'll need 8 times the power 

simpler yet, ride safely, and s**t in the bathroom 

 

reminds me of when that guy from top gear was doing the top speed run on a Veyron.
" at 253 mph the tires will disintegrate in 15 min, but thats ok because we will run out of gas in 8 min" maybe not the exact words he said but you get the picture.

I could Probably Make it Past 400 Because I just don't Give a F&^$@ anymore. 

Yeah, but when you get to that 15 degree 9,000 foot radius corner will it make it 'round?


















I think not...   

i think dodge built it so that when asked why they could say," because we can. because we wanted to."

OK air drag isn't going to stay as a steady power 3, in the empirical calculations If I remember there is a 6th power of velocity lurking in there. Its pretty small cos its divided by like a million or something but as you get it to that 200mph mark its starts to rear its ugly head.
So you may need 8 times the power to go 200 as you need to do a 100 (identical aero's and weight assumed here which BTW is absurd) but to go 400 you will need 64 times that power (or something like that). Ofcourse you'd be dumping your exhaust in your wake thereby minimising the effect of that wake, sucking air from in front of your nose to burn in the motor, and disrupt that compression zone and you could squeak by with just like 63 times. Yea.
Cool.
Srinath.