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  #1  
Old 10-11-2012, 09:15 AM
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Huskymaniac Huskymaniac is offline
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Did you know...

Just for fun, I wanted to start a thread about interesting and possibly little known facts which may be relevant to folks here. I will start with this tidbit I discovered today while doing actual work/research:

Did you know that Aluminum powder, especially when in the form of small/fine particles, will spontaneously combust when exposed to air? I thought I would be fine so long as I stayed away from Magnesium. I think this is usually not an issue as aluminum particles typically oxidize before we gather enough of them together for it to be an issue.
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  #2  
Old 10-11-2012, 09:48 AM
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icingdeath88 icingdeath88 is offline
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Re: Did you know...

Organic chemist here. What kind of research do you do?
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  #3  
Old 10-11-2012, 10:15 AM
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Re: Did you know...

Quote:
Originally Posted by icingdeath88 View Post
Organic chemist here. What kind of research do you do?
I am an optics/laser engineer but I have found myself dabbling in organic chemistry this past week. I am particulary interested in thermally cured epoxies/plastics which are highy transparent at a wavelength of 1um, have an index of refraction of 1.49 (or slightly higher) at 1um and have a long term operating temperature of at least 150C. Any suggestions?
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
2009 Red Toyota Venza, 123,XXX, Mobil 1 5W30 High Mileage Oil
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  #4  
Old 10-11-2012, 10:42 AM
BackWoodsBob BackWoodsBob is offline
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Re: Did you know...

I worked in a lab as a tech for a while. We had atomized aluminum, but never had it combust.
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  #5  
Old 10-11-2012, 02:52 PM
wdb wdb is offline
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Re: Did you know...

[posted in the spirit of the original thread intent]

...that Britney Spears' panties spontaneously combust upon contact with the light flash from a camera?
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  #6  
Old 10-11-2012, 03:37 PM
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icingdeath88 icingdeath88 is offline
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Re: Did you know...

Quote:
Originally Posted by Huskymaniac View Post
I am an optics/laser engineer but I have found myself dabbling in organic chemistry this past week. I am particulary interested in thermally cured epoxies/plastics which are highy transparent at a wavelength of 1um, have an index of refraction of 1.49 (or slightly higher) at 1um and have a long term operating temperature of at least 150C. Any suggestions?
Ah. You want the guys down the hall from me - polymer chemists. Sounds like interesting stuff.

Did you know that if you try to clean up lithium aluminum hydride with acetone, you make isopropanol? And also fire.
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'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album
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  #7  
Old 10-12-2012, 05:47 AM
dcarrb dcarrb is offline
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Re: Did you know...

Did you know Buddy Ebsen (Jed Clampett on the "Beverly Hillbillies") lost his gig as the Tin Man on the classic "The Wizard of Oz" due to an allergic reaction to the aluminum powder in his silvery makeup?

It's important to know these things...

dcb
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  #8  
Old 10-12-2012, 07:09 AM
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Re: Did you know...

Did you know that a banana tree is not a tree, but a herb?

And that the banana is not really a fruit at all, but a berry?

.
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R.I.P. 2010 Subaru Outback Limited 2.5 CVT...338,000 miles. Totaled by a 1,300 lb. COW March 4, 2016

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  #9  
Old 10-14-2012, 10:03 AM
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Wink Re: Did you know...

A tomato's a berry, but a banana has appeal.
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  #10  
Old 10-15-2012, 03:46 PM
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Re: Did you know...

Cadillac CTS-V suspension could be stiffer.

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  #11  
Old 10-15-2012, 04:29 PM
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Re: Did you know...

Quote:
Originally Posted by icingdeath88 View Post
Organic chemist here. What kind of research do you do?
Hey, cool. My father had a PHD in organic chemistry.
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  #12  
Old 10-16-2012, 10:30 AM
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Re: Did you know...

Quote:
Originally Posted by Landshark View Post
Cadillac CTS-V suspension could be stiffer.


....Then put her in a Turbo Mustang....SSDD

....


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1996 Polo Green LSi #216..138,100 miles...SOLD

JFICX8659TH100216.....Date of Manufacture: November 16, 1995.....
Fuji Heavy Industries..Ōta North Plant....Ōta City,. Gunma Prefecture, Japan

In-Service Date: January 2, 1997



"The Pristine Green Polo Machine”
First Polo Green on the Network
First Clear front turn signals, JDM Alcyone hood emblem, rear panel, and BOXER engine cover on the Network (US) (2000)
First 5000K HID factory fog lights (2007)
First SVX JDM BBS wheels on a USDM SVX (2013)

HID lighting (5000K) for headlight and H3 fog lights, PIAA SuperExtreme 120W high beams, rebuilt EG33 longblock, Cometic head gaskets, Phase II flexplate, AMR aluminum radiator with custom silicone hoses, 160A high-output alternator in aluminum-ceramic coated case, new design alternator wiring upgrade v.4, rare factory headlight protectors, refinished JDM BBS mesh aluminum wheels and custom, polished billet aluminum new hex center caps, LED grille mod, R1 Concepts high-carbon cryo slotted rotors, Akebono ceramic pads, Goodridge S/S braided brake lines, Smallcar Stage 1 shift kit, ThermalTech aluminum/ceramic-coated valve covers, Energy Suspension urethane front & rear swaybar bushings, Bontrager22 rear swaybar with QS Components Chromoly Teflon/Kevlar endlinks, "$15.00/5 minute" suspension mod. Hella Supertone horns, Custom stainless steel exhaust system with 2" headpipes, Magnaflow cats, AeroTurbine AR25 resonator /AWD "Bullet" muffler.


R.I.P. 2010 Subaru Outback Limited 2.5 CVT...338,000 miles. Totaled by a 1,300 lb. COW March 4, 2016

2014 Hyundai Avante Limited ... 203,000 miles. Actually quieter and smoother than the Outback

2007 Mazda Miata MX-5 PRHT...102,000 miles.
Plenty of parts, service and windshields.


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  #13  
Old 10-22-2012, 02:57 PM
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Re: Did you know...

Quote:
Originally Posted by Huskymaniac View Post
Just for fun, I wanted to start a thread about interesting and possibly little known facts which may be relevant to folks here. I will start with this tidbit I discovered today while doing actual work/research:

Did you know that Aluminum powder, especially when in the form of small/fine particles, will spontaneously combust when exposed to air? I thought I would be fine so long as I stayed away from Magnesium. I think this is usually not an issue as aluminum particles typically oxidize before we gather enough of them together for it to be an issue.
Yes. It makes a great solid fuel for model rocketry.

-Mike O
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  #14  
Old 10-22-2012, 03:22 PM
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Re: Did you know...

What are the mu ratio and the mu-1 barrier?

Mu is the English spelling of the Greek letter μ. It can be pronounced "mew" or "moo," with "mew" being the more common. It is commonly used to represent a ratio in rotorcraft engineering, sometimes called the rotor tip advance ratio. To put it about as simply as it can be put into words, the μ ratio is the ratio of the forward speed of the aircraft to the rotor tip speed relative to the aircraft. To put it into a picture, which is worth a thousand words:


where Vtip is the tip speed of the rotor, VA is the speed of the aircraft, and μ is the mu ratio.
There are a few interesting things that can be determined from the μ ratio. First, and most obviously based on how μ is defined, you can easily determine the airspeed over the tip of the rotor at the 3 and 9 o'clock positions (when the rotor is perpendicular to the aircraft). When you are at a μ of 1, the tip speed is equal to the aircraft speed. So, on the advancing blade, at the 3 o'clock position, the airspeed over the tip is twice what it is over the rest of the aircraft. On the retreating blade, at the 9 o'clock position, the airspeed over the tip is zero.

Another interesting thing that can be determined from the μ ratio is how much of the rotor is seeing reverse airflow at the 9 o'clock position. Each position on the rotor blade sees a different airspeed, which is a combination of the speed from the rotor turning and the speed from the aircraft. As you move outboard on the rotor, the rotational velocity gets higher. The μ ratio will tell you what proportion of the retreating blade is seeing reverse flow at the 9 o'clock position. For example, at a μ of 0.3, the inboard three-tenths of the retreating blade will see reverse flow, the outboard seven-tenths will see normal flow, while the point exactly at three-tenths will have an airspeed of zero. At a μ of 1, the tip of the retreating blade will have an airspeed of zero, and everything inboard of that will see reverse flow. That is the μ-1 barrier. It is the point at which the rotor first sees complete reverse flow on the retreating blade. The CarterCopter Technology Demonstrator became the first rotorcraft to achieve a μ of 1 in June 2005. The previous high of 0.92 was established around 50 years ago by the McDonnell XV-1 .


Diagram of Rotor Flow Direction for μ < 1

Diagram of Rotor Flow Direction for μ = 1

Diagram of Rotor Flow Direction for μ > 1
From a flapping stability standpoint, a μ of 0.75 is the most unstable.
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  #15  
Old 10-22-2012, 07:03 PM
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Huskymaniac Huskymaniac is offline
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Re: Did you know...

Quote:
Originally Posted by Stevebsy View Post
What are the mu ratio and the mu-1 barrier?
Are you studying helicopters?

My father knew Igor Sikorski. Igor used to go to the club soccer games and my father played for one of the Italian clubs, back in the 50s.
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1996 Polo Green Subaru SVX LSi, 168,XXX miles, Redline D4 ATF, Redline 75W90 gear oil, K&N HP-4001 Oil Filter, Mobil 1 5W50 FS (3qt) and 5W30 High Mileage (4qt) Oil Blend, Motul RBF600 Brake Fluid, AC Delco A975C Air Filter, NGK BKR6EIX-11 plugs, Centric Rotors, Power Stop Evolution Carbon Fiber Ceramic Brake Pads
2005 Gray Acura RL, 165,XXX miles, Redline D4 ATF with Lubegard Platinum Protectant, Mobil 1 5W20 High Mileage Extended Performance Oil
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