Heavy flywheels and increased spool...WHAT?? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-06-2010, 10:59 AM   #21
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if you leave me now, you take a away the biggest part of me...

ohwohweoheweeweeeii noooo baby please dont go.
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Old 08-06-2010, 11:11 AM   #22
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This thread's topic of discussion has clearly been resolved.... and the only thing left to do is post random shizz.

Oh, speaking of that, I made toast last night and put Maple Butter spread on it. OMFG it was amazingly delicious.
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Old 08-06-2010, 11:30 AM   #23
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I didn't eat last night... Consider yourself lucky. I did however have a big tasty beer though...
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Old 08-06-2010, 11:39 AM   #24
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I had a BBQ'd chicken and Ranch salad. Then I had two Fudgee-O's (no homo) and two Oreos. Then I attacked a bag of Miss Vickie's Sweet Chili and Sour Cream chips. I also had a massive glass of OJ. I don't mean to rub in my delicious and awesomely epic meal to you, I was just saying what I ate. Bah ha ha ha ha.

I saw a bottle of Bud in the back of the fridge, but I refrained. I still have a bit of Crown to kill... mmmmmmm.
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Old 08-06-2010, 11:40 AM   #25
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McLaren F1s don't have a flywheel.
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Old 08-06-2010, 11:42 AM   #26
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I have a headache.
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Old 08-06-2010, 11:50 AM   #27
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I have an erection....
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Old 08-06-2010, 12:03 PM   #28
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Quote:
Originally Posted by E-NA6CE View Post
Here's my Out Of The *** post on Critical Mass.

Insert bunch of crazy *** **** here.
You're wrong.
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Old 08-06-2010, 12:15 PM   #29
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Sounds delicious... The food, not the erection. Just thought I should clarify that. Haha
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Old 08-06-2010, 12:17 PM   #30
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Quote:
Originally Posted by fooger03 View Post
You're wrong.
Ha ha ha. For the record, I have no idea WTF all that jargon is.

Quote:
Originally Posted by thagr81 us View Post
Sounds delicious... The food, not the erection. Just thought I should clarify that. Haha
You lie like a rug.
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Old 08-06-2010, 12:28 PM   #31
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^^^^ WOW all this cause I was confused by heavy flywheels.
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Old 08-06-2010, 12:32 PM   #32
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Quote:
Originally Posted by E-NA6CE View Post
Here's my Out Of The *** post on Critical Mass.

Uranium-233 is a fissile artificial isotope of uranium, part of the thorium fuel cycle which has been used in a few nuclear reactors and has been proposed for much wider use as a nuclear fuel. It has a half-life of 160,000 years.

Uranium-233 is produced by the neutron irradiation of thorium-232. When thorium-232 absorbs a neutron, it becomes thorium-233, which has a half-life of only 22 minutes. Thorium-233 decays into protactinium-233 through beta decay. Protactinium-233 has a half-life of 27 days and beta decays into uranium-233; some proposed molten salt reactor designs attempt to physically isolate the protactinium from further neutron capture before beta decay can occur.

233U usually fissions on neutron absorption but sometimes retains the neutron, becoming uranium-234, although the proportion of nonfissions is smaller than for the other common fission fuels, uranium-235, plutonium-239, and plutonium-241. It is slightly smaller at all neutron energies.

The fission of one atom of U-233 generates 197.9 MeV = 3.171 10−11 J, i.e. 19.09 TJ/mol = 81.95 TJ/kg.

Critical Mass is roughly 15kg.

The critical mass for lower-grade uranium depends strongly on the grade: with 20% U-235 it is over 400 kg; with 15% U-235, it is well over 600 kg.

The critical mass is inversely proportional to the square of the density. If the density is 1% more and the mass 2% less, then the volume is 3% less and the diameter 1% less. The probability for a neutron per cm travelled to hit a nucleus is proportional to the density. It follows that 1% greater density means that that the distance travelled before leaving the system is 1% less. This is something that must be taken into consideration when attempting more precise estimates of critical masses of plutonium isotopes than the approximate values given above, because plutonium metal has a large number of different crystal phases which can have widely varying densities.

Note that not all neutrons contribute to the chain reaction. Some escape and others undergo radiative capture.

Let q denote the probability that a given neutron induces fission in a nucleus. Let us consider only prompt neutrons, and let ν denote the number of prompt neutrons generated in a nuclear fission. For example, ν ≈ 2.5 for uranium-235. Then, criticality occurs when νq = 1. The dependence of this upon geometry, mass, and density appears through the factor q.

Given a total interaction cross section σ (typically measured in barns), the mean free path of a prompt neutron is \ell^{-1} = n \sigma where n is the nuclear number density. Most interactions are scattering events, so that a given neutron obeys a random walk until it either escapes from the medium or causes a fission reaction. So long as other loss mechanisms are not significant, then, the radius of a spherical critical mass is rather roughly given by the product of the mean free path \ell and the square root of one plus the number of scattering events per fission event (call this s), since the net distance travelled in a random walk is proportional to the square root of the number of steps:

R_c \simeq \ell \sqrt{s} \simeq \frac{\sqrt{s}}{n \sigma}

Note again, however, that this is only a rough estimate.

In terms of the total mass M, the nuclear mass m, the density ρ, and a fudge factor f which takes into account geometrical and other effects, criticality corresponds to

1 = \frac{f \sigma}{m \sqrt{s}} \rho^{2/3} M^{1/3}

which clearly recovers the aforementioned result that critical mass depends inversely on the square of the density.

Alternatively, one may restate this more succinctly in terms of the areal density of mass, Σ:

1 = \frac{f' \sigma}{m \sqrt{s}} \Sigma

where the factor f has been rewritten as f' to account for the fact that the two values may differ depending upon geometrical effects and how one defines Σ. For example, for a bare solid sphere of Pu-239 criticality is at 320 kg/m2, regardless of density, and for U-235 at 550 kg/m2. In any case, criticality then depends upon a typical neutron "seeing" an amount of nuclei around it such that the areal density of nuclei exceeds a certain threshold.

This is applied in implosion-type nuclear weapons where a spherical mass of fissile material that is substantially less than a critical mass is made supercritical by very rapidly increasing ρ (and thus Σ as well) (see below). Indeed, sophisticated nuclear weapons programs can make a functional device from less material than more primitive weapons programs require.

Aside from the math, there is a simple physical analog that helps explain this result. Consider diesel fumes belched from an exhaust pipe. Initially the fumes appear black, then gradually you are able to see through them without any trouble. This is not because the total scattering cross section of all the soot particles has changed, but because the soot has dispersed. If we consider a transparent cube of length L on a side, filled with soot, then the optical depth of this medium is inversely proportional to the square of L, and therefore proportional to the areal density of soot particles: we can make it easier to see through the imaginary cube just by making the cube larger.

Several uncertainties contribute to the determination of a precise value for critical masses, including (1) detailed knowledge of cross sections, (2) calculation of geometric effects. This latter problem provided significant motivation for the development of the Monte Carlo method in computational physics by Nicholas Metropolis and Stanislaw Ulam. In fact, even for a homogeneous solid sphere, the exact calculation is by no means trivial. Finally note that the calculation can also be performed by assuming a continuum approximation for the neutron transport. This reduces it to a diffusion problem. However, as the typical linear dimensions are not significantly larger than the mean free path, such an approximation is only marginally applicable.

Finally, note that for some idealized geometries, the critical mass might formally be infinite, and other parameters are used to describe criticality. For example, consider an infinite sheet of fissionable material. For any finite thickness, this corresponds to an infinite mass. However, criticality is only achieved once the thickness of this slab exceeds a critical value.

ummmm wow...I think my brain just reached critical mass. So how do I apply this to my setup to decrease spool time??

Last edited by hingstonwm; 08-06-2010 at 05:32 PM.
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Old 08-06-2010, 12:33 PM   #33
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If you have a headache, then have an erection, does the headache go away?
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Old 08-06-2010, 12:45 PM   #34
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Quote:
Originally Posted by djp0623 View Post
If you have a headache, then have an erection, does the headache go away?
Only when you bust! BAH HA HA HA!!!
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Old 08-06-2010, 12:46 PM   #35
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Quote:
Originally Posted by hingstonwm View Post
ummmm wow...I think my brain just reach critical mass. So how do I apply this to my setup to decrease spool time??
Ha ha, install a more efficient turbo. Ir install a lighter flywheel. Either way, with just a lighter flywheel it's simply a time-sensitive issue, not RPM-dependent.
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Old 08-06-2010, 01:04 PM   #36
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This thread is about to be deleted by the NSA, the CIA, and a group of which you guys have never heard, due to highly sensitive information. Rick will not be pleased.
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Old 08-06-2010, 01:07 PM   #37
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Quote:
Originally Posted by Cococarbine3 View Post
This thread is about to be deleted by the NSA, the CIA, and a group of which you guys have never heard, due to highly sensitive information. Rick will not be pleased.
Rick is my receptionist. If anyone won't be pleased it's me. He just relays my emotional discomfort. Bah ha ha ha ha. Rick is my bitch, and I approve of this thread.
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Old 08-06-2010, 02:36 PM   #38
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In all seriousness- Knotts' apple-cinnamon jelly on an english muffin. Had it at a diner in LA a few weeks ago. Quite yummy.
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Old 08-06-2010, 02:39 PM   #39
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You know what's more serious than that? This cake.

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Old 08-06-2010, 03:15 PM   #40
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I just had an ice cream sandwich.
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