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swft

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posted May 30, 2003 08:52 AM

Edited By: swft on 30 May 2003 09:53

How many G's?

Here's a question for you guys out there. How many G's would you have to pull to break the speed of sound in a quarter mile. Say it's sea level, so that's what, 620mph? Chuck Yeager did 662 to break it at 25,000 feet, so it's gotta be lower than that at sea level. That would give us an idea of how big a turbo to put on a 12.

deathpulse

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posted May 30, 2003 08:56 AM

ok - @ sea level the spead of sound is about 750Mph - its gets lower as you go higher, because the air density is lower (the closer/denser the molocules the FASTER sound can vibrate through them). soo... assuming you are moving from 0 to 750 Mph in 1/4 mile....

deathpulse

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posted May 30, 2003 08:57 AM

actually, I meant to say the speed of sound gets "lower" at higher altitudes because the air density is lower at higher altitudes.. the explanation is still the same

.... dense air = high speed of sound, less dense air = lower speed of sound =P

deathpulse

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posted May 30, 2003 08:58 AM

BTW - 1 "g" is 9.8 meters/second squared (I think?? checking now..)

your car is slow

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posted May 30, 2003 09:12 AM

yeap..9.8meters persec persec of accelleration...and given that accelleration isnt constant during a 1/4 mile run...this would be somewhat difficult to figure out.

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dougmeyer

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posted May 30, 2003 09:18 AM

You have to know the weight (mass) of the body you are accelerating.
Doug

deathpulse

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posted May 30, 2003 09:35 AM

yep - we need mass and.. lets see, that should be it for Nutonian physics

deathpulse

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posted May 30, 2003 09:39 AM

BTW - calculating the POWER required to break the sound barrier with a '12 is a MUCH harder calculation. Air pressure gets interesting in the "trans-sonic" area (around .9 mach). For instance, it requires less power to travel 751 Mph (FASTER than the speed of sound) then it does to travel 749 Mph (SLOWER than the speed of sound). I have the equations written in front of me, but I don't feel like cranking them out - its too nice a Friday

kcadby

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posted May 30, 2003 10:22 AM

Edited By: kcadby on 30 May 2003 11:23

It's also a TIME over distance to S.o.S. ...not just speed/distance...

Well since no-one else answered (with a #)...
UMMMmmm... LOTS

I CAN tell you that...a 1.12ish 60ft (over 60MPH) is 3Gs...

swft

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posted May 30, 2003 10:38 AM

I was goofed up, was thinking it was higher. Shit, I'll have to recalculate everything. ZX12R + Rider = 700 lbs total.

swft

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posted May 30, 2003 10:47 AM

Check my math:

750mph = 1100 feet per second

In a vacumn, a object would accellerating at 32 fps would reach 1120 fps in 35 seconds, right? And travel 20466 from a starting point.

swft

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posted May 30, 2003 10:49 AM

Edited By: swft on 30 May 2003 11:52

Top fuel must see just about a constant 3G, or maybe 5G initial and 2 plus constant. 3G constant works out to 320+ mph at the quarter mile stripe. If they were able to continue at that accelleration rate for a full mile (and no greater wind resistance) they would reach over 670mph at the one mile mark!

RAC4IT

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Bergie
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posted May 30, 2003 11:02 AM

You guys are WAY to bored! Stop trying to jumpstart my brain! I prefer it's usual dormant status!

swft

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posted May 30, 2003 11:09 AM

I think it's somewhere over 18Gs. You'd get 576 feet in the first second, so you'd have a sub-1 second 1/8th mile time, and would crack the sound barrier right before crossing the lights. Hmm...Gonna need a chute, I think.

swft

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posted May 30, 2003 11:11 AM

Now the question is, giving up the traction or aero arguments, how much horsepower to accellerate a 700lb object to 18Gs?

swft

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posted May 30, 2003 11:18 AM

Ok, so I'm moving 700 lbs a distance of 576 feet in 1 second...

GOZR

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posted May 30, 2003 11:34 AM

Edited By: GOZR on 30 May 2003 12:38

I went 7.5 g's
Touk me the whole week to go back at normal feeling..
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dougmeyer

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posted May 30, 2003 01:29 PM

I've been about 6 to a blackout w/o g suit-just grunting.

The Top Fuel article cited 4.5 g at the launch, still carrying 1g acceleration at the lights.

Doug

swft

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posted May 30, 2003 07:22 PM

Hey Doug, that'd make sense, yep.

jonwright

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posted May 30, 2003 10:07 PM

Frikin' rocket scientists, I tell ya.

WAAAYYY too much time on yer hands, my boys. 'course, if yer number crunchin' all day long anyway how 'bout helpin' me figgure out how much a single man will get with the new tax cuts Bush signed the other day?

How 'bout NUTHIN!!

EastBayDave

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posted May 31, 2003 04:58 AM

gawdamnit, I haven't even got to my second cup yet....

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deathpulse

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posted May 31, 2003 04:46 PM

good work guys! BTW 18 G's IS doable.... just has to be for a small amount of time (very small) the trick on high G loading is time of g load on the human body - and there are some threshholds for high G loading that you can NOT cross - like the g load that occurs when you decelerate from terminal fall velocity to ZERO (like when you fall out on an airplane without a chute). Very few live to see that kind of instant g!

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