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  1. LostHippie

    Thinking about making the jump.

    Yea, as much as this current job sucks...it doesn't suck enough to jump to that job. Oh well, I'll keep looking...if anything it helps me appreciate the job I have a little more, and patprimmer, thank you for the incite into my potential personality conflicts that I may have not noticed. I will...
  2. LostHippie

    Thinking about making the jump.

    Sorry to double post... @debodine: Yea I'm not sure what his problem is, but I hold no grudges. I am mostly just confused by his actions but try my best to work with him, he just seems to be under a lot of stress lately and has decided that I will be his punching bag for the time being. I...
  3. LostHippie

    Thinking about making the jump.

    @JedClampett: haha actually I do not have cable at the moment, Netflix only. @Mint Julep: Actually I will save money by downsizing to a smaller apartment (my apartment is bigger than I need, and is built so crappy that I will end up cutting my utility bill in half, and cut my rent by 25%. And...
  4. LostHippie

    Thinking about making the jump.

    So, I am a recent college graduate that has been working with a small diesel engine spinoff company of a larger transport corporation for about 7 months. The job pays well below the average starting salary for mechanical engineers, and gives a flat, yearly pay increase of 2%. The benefits and...
  5. LostHippie

    diesel vs gas

    small SI engines usually can get to about 10:1 or 11:1 compression ratios on conventional gasoline before you start having problems with autoignition. small CI engines running on No. 2 Fuel oil (standard diesel fuel) run anywhere from 15:1 up to 25:1. Diesel engines typically see higher...
  6. LostHippie

    EXHAUST GAS HIGH TEMPERATURE AND T/C SURGING!!!!

    2 stroke or 4 stroke? Sounds to me like an overloading condition, what kind of speed control (governor) do you have on this thing?
  7. LostHippie

    Si Engines and detonation

    Detonation typically occurs near TDC...preignition is when the combustion process begins well before TDC...resulting in the engine having to compress the hot gasses to the clearance volume after all of the combustion energy has been released...resulting in much higher temperatures and pressures...
  8. LostHippie

    Si Engines and detonation

    So are we talking about detonation or pre-ignition? My understanding was that pre-ignition was the phenomenon that causes pistons to melt...but that has more to do with the high pressures, temperatures, and time of exposure to said conditions coupled with the concept of thermal inertia on the...
  9. LostHippie

    corrosion in a steel+aluminium construction

    there are many ways of dealing with this: you could choose an aluminum alloy series that has a similar galvanic potential to the mild steel, you can find galvanic potential tables all over the internet. you could install sacrificial anodes of some sort electrically connected to various...
  10. LostHippie

    Question in the evaporation of water

    Seems to me that if you are considering the gaseous mixture of Air and water vapor, and assuming that the temperature remains constant, with an RH that low you will certainly get evaporation, which in the case of the aforementioned system would act as a mass flow into the system, in the form of...
  11. LostHippie

    Question in the evaporation of water

    Well it really depends on the units of temperature as to how the system behaves...30 degrees Celsius is very different from 30 kelvins.
  12. LostHippie

    Dressing for an Interview

    I'm in the same boat sir, working in a company who's view on the task at hand is "bleh" at most. Thinking outside the box is discouraged, new ideas are discouraged, any type of change is highly discouraged. I feel like not only am I not getting paid enough for this job, but I'm also not...
  13. LostHippie

    Si Engines and detonation

    By definition, detonation is when the flame fronts or propagation of a chemical reaction through the medium is faster than sonic velocities...causing unusually fast increases in temperature and pressure. I haven't done any work with Internal Combustion Engines in a while but I think that in the...
  14. LostHippie

    Heat transfer between warm air and cold water

    condensation will begin as droplet formation, with a much higher heat trasnfer rate, once the droplets become large enough that the centrifugal forces overcome the adhesive and cohesive forces that bind the water to the endcap and itself, then it will begin to flow, ideally into a "sheet" of...
  15. LostHippie

    Heat transfer between warm air and cold water

    if you are generating roughly 1g at the inner surface of the cylinder, and assuming similarly sized plant and building structures, then the friction layer will extend theoretically beyond the axis (about 1500m for earth) so this verifies that the air is spinning about the axis at roughly the...
  16. LostHippie

    heat transfer in a non insulated house

    Heat transfer is affected by many factors...especially on the scale you are talking about: Temperature outside Temperature inside Humidity outside Air movement both outside and inside Orientation of surfaces Emmissivity of certain materials Solar insolation (day) Cloud cover (night) structure...
  17. LostHippie

    Salary question !

    Data Point" 2011 Eastern NC B.A. in Mechanical, ~1 year experience $50k, mediocre benifits
  18. LostHippie

    Heat energy conversion

    Seems to me that as long as you have a working fluid with good heat transfer characteristics and does not change phase (from the gaseous phase) at the temperatures and pressures it will be subjected to inside the engine, and a properly designed Stirling engine, and there is a moderate...
  19. LostHippie

    Heat energy conversion

    Stirling engines will work on very low temperature differentials...but because of this low delta T, the flow of heat through the system is very slow, and hence produces very low wattages at low delta T's. The only way to compensate for this is to either increase the temp. difference (in your...
  20. LostHippie

    Otto cycle efficiency

    I agree with ione...usually for theoretical calculations you use the air-standard otto cycle setup, where k is the specific heat ratio of air. peace, LostHippie

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