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Here's a question, possibly related to old blades. I use an electric rotary shaver, I've never used any straight blade. Now and then, I get little nicks, usually on my neck, which almost bleed a tiny bit. These are not from the whiskers getting snagged and being forcably pulled out, that's a...

Metalguy, I'm sure submerging the razor in alcohol accelerated the corrosion because of the water in the alcohol. Instead of just atmospheric moisture being in contact with the metal, now a lot of water was in contact. Leaving the blade in the handle could have also promoted corrosion if the...

Here are some sites I found with a simple search for liquid nitrogen production: http://www.waltainfo.com/EnNews/2002/Jan/15Jan02/Jan15e6.htm http://www.stirling.nl/sp/sp3.html http://www.fbodaily.com/cbd/archive/1997/10(October)/16-Oct-1997/36sol002.htm http://www.stirling.nl/sp/sp4.html...

I don't know what kind of metal they are made of, but assuming you don't have a dessicator, or other dry place to store them, perhaps a thin layer of baby oil on the edge would protect it from moisture in the air. I assume they are kept in the bathroom, a relatively humid room. If you don't...

Kevin, What I would do is monitor the temp with a high thermal resolution infrared optical monitor. No contact with a measuring device to affect readings. To control temp, I would design a sensitive device to gently blow air over the measured area. By mixing slightly warm air with slightly...

Chicopee, I would not expect a mild, or strong, etch to remove the ghost on the aluminum. It would depend on what the ghost was made of (would it be attacked by the etchant.) Also, all the surrounding aluminum would need to be protected from the etchant aince without the (possible) protection...

I don't know about epoxy paint, but I've heard that epoxy glue can be loosened with a chemical called: N-methylpyrrolidone It's easy to obtain, doesn't have a very high vapor pressure, has low odor and low toxicity, and can be washed away with either water or organic solvent. By itself it...

I remember reading once that, ideally, the "bell" should do more than just curve away from the mouth of the intake, as seen in the photo you referenced. I read that the optimal shape is for the edge of the "bell" to curl back on itself rather than simply stop in mid air...

jhillyer, Aromatics do promote CCDs, when used long term, because they are notorious soot producers.

Drwebb, I'm sure about the solids in gasoline. They remain in liquid form because it is a complex mixture. If purified they would solidify. I spent 8 years in the petroleum industry analyzing gasoline-like petroleum fractions, identifying the possible molecular structures for each compound...

Patprimer, In refrence to your Jan 16 post, toluol is indeed the same as toluene. It's just an outdated name which most companies don't use anymore. The C6H5-OH you list (corrected for the proper number of hydrogens) is actually phenol. This is an acidic, sharp smelling compound that used to...

Ok, but RC airplane entheusiasts don't have any trouble using methanol fuel in their aluminum plane engines. The cylinders are usually lined in some way but the whole engine gets hot and the fuel inlet and outlet are bare aluminum. RC plane fuel also contains nitromethane and lubricant but...

I saw the following post on another forum and can't explain it... "A word about using methanol around aluminum. Here at work we have high pressure liquid chormatography systems that use methanol as an eluent. We were having problems with the system and it turned out that the methanol was...

Ok, well, that's all the info I had. I guess I wasn't any help after all. I'll try to be more careful in the future.

You might want to take a look at the post by Skelly in the "reflective coatings" thread in this forum. Here are some websites that mention various kinds of heat dissipating coatings (mostly for automotive use.) Maybe you'll be able to get some info from them. Gun Kote...

I don't know if any of this will be helpful to you but just in case it is, here is some info I have on hand (I found it in a library book): All data is for a 3" diam pipe: The pressure drop in inches of water at the listed air velocity per 100' of pipe: Velocity....Pressure Drop...

I was thinking about this too, but I think the problem is all the variability in driving patterns/habits, etc. to allow for decent accuracy. What I was going to do is take a stopwatch with me for several days of "typical" driving. I'd note the total number of miles driven each day...

Here is some related stuff linked to the previous article: Drag Data Viscous Drag of Aerodynamic Systems Subsonic/Supersonic Drag with LFC Drag Coefficients of Bluff Bodies Drag Coefficients of Streamlined Bodies Drag Coefficients of Aerodynamic Systems Drag Coefficients of Human Drag...

I found a database of drag coefficients for 6 catagories of objects. Maybe this will help someone. Some of the data looks similar to what I saw in the library book I haven't been able to find: Description Table 1 reports some typical values for widely studied bluff bodies. Table 2 is a...

Franzh, Thanks for the info about ECM-PCM relearning. This is also something I've has questions about in the past but I had trouble finding good answers to this too. I was surprised so few people could explain how the ECM could relearn or adjust to new conditions.