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  1. kiwinjuneer

    water cooling

    If this is an ongoing produced-water disposal problem, suggest you look at a binary-cycle power generation plant such as ORMAT (Israeli I think). These systems use Propane or Ammonia as the power fluid and don't recall the OA efficiency but would think that you could generate quite a few MWe...
  2. kiwinjuneer

    Bushing for 100C, 212F, replace PEEK with cheaper polymer?

    There are special grades of Nylon that absorb less water but still need to watch clearances or the bush will grab the shaft/axle. Also use a resin with Aramid or Carbon fiber to aid stability. Carbon will cause premature wear of the other surface though, where the Aramid (Kevlar) will not...
  3. kiwinjuneer

    Enthalpic Twin-wall Fluteboard Wanted

    We are looking for a twin-wall material with enthalpic properties for use in fixed-plate Energy Recovery Ventilators wherein we wish to recover both sensible and latent heat. Can anyone help please? Thanks Geoff
  4. kiwinjuneer

    Vibratory Stress Relief for improving fatigue life

    Thanks metengr and swall and I do apologise to all for not using the right search box on the tool bar. The eng-tips forum search only seems to pick up the current threads while the google one gets those older ones referenced above. After reading them I am still confused though and it seems...
  5. kiwinjuneer

    Vibratory Stress Relief for improving fatigue life

    Thanks Pressed Interestingly, "something" happens to the crystaline structure of the metal with VSR as I have used it on numerous occasions to pre-camber crane and bridge beams. You simply set the beam down on numerous packers of appropriate thickness, plug in the VSR unit in the evening and...
  6. kiwinjuneer

    Vibratory Stress Relief for improving fatigue life

    Can anyone clarify the effectiveness of Vibratory Stress Relief for improving the fatigue life of carbon steel? Can a component that may be subject to fatigue failure, be stress relieved on a regular basis using VSR and have its service life prolonged? Does VSR actually convert Martensite...
  7. kiwinjuneer

    drilling rig type for subsea well

    suraiya I too, have male answer syndrome but have had a bit to do with marine riser design and I think your answer is, it depends... If you are in sheltered waters such as is found in many places along the GoM, the answer is probably yes. If not, the water depth relative to the wave-induced...
  8. kiwinjuneer

    Paraffin problems?

    swemin I know of a couple of companies that used an adaptation of MHD to control wax. One is Magnaflow and it was run by Chuck Selinger out of Odessa, TX and the other Mag-well run by Mark Varel in Dallas, TX. I don't know if they are still operating but we had some limited success with...
  9. kiwinjuneer

    Casing thread strength

    What would be the objective of the Nickel? To improve corrosion or reduce galling? If the latter, various phosphate based coatings are used with some success. "Tubingless" completions are already used extensively in high-volume gas wells and are otherwise known as monobore wells. If I have...
  10. kiwinjuneer

    Vortex Cell Wing

    I would be interested too because I have an interest in low aspect ratio wings. On this subject, can someone explain how a Stork can fly so far with its stubby inefficient "low aspect ratio" wings? Are the feather pronged wing tips significant? I mentioned in an earlier post about the son of...
  11. kiwinjuneer

    Vortex Cell Wing

    Thanks for a really interesting post. Unfortunately my post wasn't at all clear because the "golf ball type" surfacing I referred to was applied to and claimed to achieve a 13% drag reduction on a high speed AIRFOIL. I can only assume that as with a golf ball, the dimples helped reduce wake...
  12. kiwinjuneer

    Vortex Cell Wing

    tbuelna made mention that most of the efficiency gains with the 787 come from the engines. This being the case, what became of the golf ball surfacing I read about a few years back, that was claimed to reduce high speed drag by 13%? Another unfounded "spouting off" that never came to...
  13. kiwinjuneer

    Need formula for deflection

    Die-cast has very high strength compared to sand or investment cast. But it is also very brittle which is hardly conducive to impact loads and maybe some post-casting ANNEALING would be in order? Aside from doing the dynamic stress calculations, I would also look very closely at the...
  14. kiwinjuneer

    Vortex Cell Wing

    Here's one interesting account I read about why bumble bees can fly. It is obvious to any scientist that the bumble bee can fly as experiment proves it. So what is this business about proving bees cannot fly? And who started it? First let's look at the physics behind the story. If you are...
  15. kiwinjuneer

    Vortex Cell Wing

    Hey Steven, Thanks for the very interesting link. I was about to write a note to the effect that the stepped profile may reduce drag but couldn't possibly generate lift because it contravenes the Bernoulli Principle. But then I went and read the link... As a Aerospace guy, I would be...
  16. kiwinjuneer

    Vortex Cell Wing

    Thanks btrueblood. I didn't think through the stepped hull analogy too well. What I find interesting though, is that the EU has committed $2.2M to a 3 year study so it seems that they think there is something in it. Maybe you could pop over to Europe to enlighten them and save a couple of...
  17. kiwinjuneer

    Vortex Cell Wing

    Thanks for your comments. My query arose from a discussion I was having with some colleagues where I asked them why a wing hadn't been developed that worked on the stepped surface hydroplane principle. About a week later, one of them showed me the article referenced including the diagram that...
  18. kiwinjuneer

    Supercritical Steam Tables

    Hey thanks guys. Being (much) more familiar with english, I went with 25362's link and now have all the data I need. Very much appreciated!
  19. kiwinjuneer

    Any Eng. Managers or Engineers with advanced degrees?

    If available and you like working on new technology AND seeing it become a reality, go for a Masters in Technology Management or Masters in Technology and Innovation. Such a program teaches you to look at the commercial reality before getting too far down the track of designing something that...
  20. kiwinjuneer

    Vortex Cell Wing

    Can anyone elaborate on the effectiveness or otherwise, of the Vortex Cell Wing as featured on P26 of the 5 September 2005 edition of Flight Internation? Thanks

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