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  1. zerosum

    Learning MicsrosoftProject

    nurhforward: Although I am currently a fan of MS Project, I must reply to your statement: <I will like to learn this vast invention of Miscrosoft Cooperation> The techniques of critical path scheduling and resource allocation, which is the basis of MS PROJECT (and PRIMAVERA, also on...
  2. zerosum

    Pressure Vessels not in Use Since 1981

    As MJC implies, panchagnula needs to post enough information that forum responders can determine whether he is dealing with a tank or dealing with a vessel. Based on size, I would think an API 620 or API 650 type tank?
  3. zerosum

    PLEASE HELP: Atmospheric tank relief capacity

    Inadvertant condensing of any vapor above the liquid can be catastophic and the possibility must be carefully safeguarded against. Rainshowers on a hot roof can be a big (think junk-the-tank) problem. Again, re-iterating <psafety's> warnings.
  4. zerosum

    PVC Piping For Problem Chiller

    We didn't even use PVC pipe for our numerous chilled water circuits in our PVC (resin) plant. Expansion/contraction, pipe support, and UV degradation require a lot of attention to detail for a system to hold up over time. We used welded C.S. chilled water and cooling tower water piping...
  5. zerosum

    PLEASE HELP: Atmospheric tank relief capacity

    It sounds like your tank was possibly built to API 650. That should be confirmed first. Appendix F of that standard tells you how to calculate the max allowable pressure as <psafety> alludes to above. Also somewhere in either API 650 or API 2000 is a vacuum allowable pressure (not much). You...
  6. zerosum

    A320 crash in the Hudson River - history of stalls?

    Took a big goose-like bird thru a J-75 (F-105D) on a morning low-level. Approx 350 KIAS at around 500 ft somewhere over Georgia, 1965. During lunch Republic borescoped the engine and I flew the PM sortie. Big hats off to P&W. As stated above, GE engines efficient but not too robust.
  7. zerosum

    Effect of Static Electricity on Aerodynamics

    The visual effects of St. Elmo's fire in high cirrus cloud can be awesome at 40,000 feet, but I don't think there's any effect on either lift or drag.
  8. zerosum

    Is Propeller Spiraling Slipstream a myth or provable fact?

    Dan320: re "Who said it wasn't?" I misread the "airlinerslink.net" site referenced above, sorry. I'm well familiar with Republic Aviation having flown the Thud for awhile. Just wasn't familiar with the Seabee. Interesting airplane. I know we're up to around 140+ posts on the thread, but...
  9. zerosum

    Is Propeller Spiraling Slipstream a myth or provable fact?

    Dan 320: Did you really have to use left rudder to counteract torque? I believe that there are (or used to be) aircraft handling quality standards that such a situation would have violated for an aircraft such as Seabee. But you said it never got type-certified in the US?
  10. zerosum

    Is Propeller Spiraling Slipstream a myth or provable fact?

    Yeah, Kenat, you're right. I had mentally discounted a solid slab configuration for yaw control. I need to jump ahead fifty years to the present.
  11. zerosum

    Is Propeller Spiraling Slipstream a myth or provable fact?

    thruthefence, rb1957, I have never heard of a trimable vertical stabilizer, most likely for the reason stated by rb1957. Lots of recip single-engine fighter pilots learned to not reach full throttle until there was enough airspeed to ensure rudder effectiveness. Even go-arounds could take...
  12. zerosum

    Wind Loads on Roof

    Makes sense. Thanks, Swearingen.
  13. zerosum

    MAWP and MAOP

    http://webwormcpt.blogspot.com/ Check this site for today 13 Nov 08. Pretty good graphic comparing all the terms.
  14. zerosum

    Wind Loads on Roof

    Isn't the wind velocity given in ASCE 7 referenced to 10 meters and your antenna is up at around 25 M? Perhaps the equation F=qz*G*Cf*Af corrects for the increase in wind velocity with altitude; I don't currently have access to the ASCE code.
  15. zerosum

    Composite wing spar design

    I tend to agree with jim787. A test pilot friend died in a midget air racer whose wing spar had been very slightly modified. Flutter was the result.
  16. zerosum

    Is Propeller Spiraling Slipstream a myth or provable fact?

    Maybe Grumman used a non-symetric airfoil for the vertical.
  17. zerosum

    Is Propeller Spiraling Slipstream a myth or provable fact?

    I took the opportunity this weekend to visit the Museum of Naval Aviation and look up the empennage of a bunch of high-powered conventional tail-draggers. Forgot my camera, but here are my observations: Around 25-30 aircraft in the above category inside the building. Quite a few were...
  18. zerosum

    Is Propeller Spiraling Slipstream a myth or provable fact?

    Good (re)seaching btrueblood. The first NACA report (for instance see Fig 14C, easy to see the asymetry due to the propwash) should should finally dispell any myths.
  19. zerosum

    Is Propeller Spiraling Slipstream a myth or provable fact?

    This is from the Princeton Aero Dept, one of the foremost centers of technical excellence in the field of aircraft stability and control in the country. I doubt that any of their Profs would propagate any myths regarding their chosen field. http://www.princeton.edu/~stengel/MAE331Lecture9.pdf
  20. zerosum

    Is Propeller Spiraling Slipstream a myth or provable fact?

    A different propwash discussion, same conclusion http://www.av8n.com/how/htm/yaw.html

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