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  1. FredGarvin

    ASTM A572 Yield Supression

    I am looking at using a structural shape (I-beam) as a support member in a test set up I am working on. Essentially I will have a cantilevered I-beam with a couple of point loads along the span. The only kicker is that it will be operating at elevated temperatures. I am considering using a beam...
  2. FredGarvin

    Innodyn tubine

    You did notice from their web site that they are not in production yet, right? http://www.innodyn.com/aviation/news_archives/news_04_12_07_01.html
  3. FredGarvin

    Drill Depth/Tap Depth Reference

    http://www.cnc-training.com/tandp/aug06.htm
  4. FredGarvin

    Bearing spin on shaft

    First thing coming to mind would be to check the alphas of the shaft and the bearing materials. Make sure the bearing isn't growing too much at higher temps.
  5. FredGarvin

    Helicopter blade deicing ideas

    CDP temperature and pressure varies from engine to engine. It is extremely warm and pressure is usually pretty high (800°F and 400 psi perhaps). I was actually thinking more along the lines of a radiant system that would not have external hole features. It would simply have an internal circuit...
  6. FredGarvin

    Helicopter blade deicing ideas

    I don't know if anyone has ever tried running compressor bleed to the blades. Granted, I can think of 5 or so technical difficulties involved, especially the sealing and routing of some kind of distribution manifold, but the big benefit is that you will always have CDP as long as you have...
  7. FredGarvin

    Bearing lockwasher source?

    I don't know where you're at, but I use Motion Industries all the time. https://www.motionindustries.com/motion3/jsp/mi/index.jsp
  8. FredGarvin

    BSME vs. BSMET degree

    I'll chime in a bit here as well. I would say that the BSME is the way to go. I had a few classes with technology types. The thing is that YOU have control over the type of job you want and will go for. If you like being hands on, there are PLENTY of jobs out there that have engineers turning...
  9. FredGarvin

    Nellis AFB "Aviation Nation" Airshow 2006 Highlights

    There are some beautiful shots there. I love the head on of the P-38, P-51, F-4U and the Hellcat on the taxiway. Thanks for that link!
  10. FredGarvin

    A ship wreck causes price rise in Ni

    I was just talking to a supplier I use. He had stated that they were implementing an increase in the next week or so. He didn't specify that that was the reason, but one of my co-workers did mention this ship's status and thought there may be a connection.
  11. FredGarvin

    orifice sizing

    http://www.pipeflowcalculations.com/orifice/index.htm http://www.lmnoeng.com/ http://www.efunda.com/formulae/fluids/calc_orifice_flowmeter.cfm
  12. FredGarvin

    Explain Entropy?

    That's probably the best explaination and the one I agree with the most. It's the one that is also easiest to put a physical connection to in my mind.
  13. FredGarvin

    twisting rotorblades

    When CH-47s went from aluminum to composite, there was a great advantage to life and weight. There is a very noticeable twist them as well. Sorry I can't shed any light into the manufacture though. I never got to see that aspect. This page is the best CH-47 resource on the net and has a good...
  14. FredGarvin

    Turbine Engine Surge Stall

    Variable inlet guide vanes are also a means of helping to delay the onset. Gordon, can you be a bit more specific when you say "wavy?" Are you refering to the swept/blended fan blade designs most of us have moved to?
  15. FredGarvin

    Tolerancing

    If you hold most parts in your hand, you'll probably make them grow .0001. We tend to hold balance arbors very tight as well. It makes sense to have the arbor as close as possible and worry about the part separately. Sure you can do arbor compensation, but on R&D hardware, you try to eliminate...
  16. FredGarvin

    What the heck are Blow Out Doors?

    "Counterfeit parts are a real and serious issue." This is true. "Aircraft in flight are intolerant of engine failure." This is not necessarily true. There are many situations where in flight shut downs occur safely. "Furthermore, asking a "dumb question" on a topic with potential life-safety...
  17. FredGarvin

    Measuring High Temperature Air Volocity

    Depends on what you call "cheap." To echo CARF's post, we use pitot tubes and we instrument all portions of our engines, including HP turbines which are much much warmer than your range.
  18. FredGarvin

    Diamond-Shaped exhaust pattern

    In a nutshell engines are designed for operation at altitude where, obviously, the ambient pressure is lower than at sea level. When the gases exiting the C-D nozzle at low altitudes is supersonic, the gas pressure continues to decrease from the choke point at the minimum cross section of the...
  19. FredGarvin

    compression fitting

    Swagelok recommends as part of their installation to ensure that the tube rests on the internal shoulder.
  20. FredGarvin

    advice for a new starter

    Sreid, Good luck in getting a print version of the McMaster catalog. My company probably does close to a quarter mil in business with them and we can never get a print version. They give us the cold shoulder. Their web site does kick butt though.

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