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  1. Mad MAC

    A Wind Turbine Design Application...looks neat!

    Vertical axis wind turbines tend to self limit at higher wind speeds due to the wake of the leading blade blanketing the next blade. Which makes them really good for DIY as they are less likely to break up in high wind speeds. The shadowing affect also means they have a lower performance for a...
  2. Mad MAC

    Electric Dreams... Pipistrel’s gift to general aviation.

    Emrax looks just any other engine manufacture, complete with proper performace specs and installation & maintenace manual. Electric may be coming of age finally. https://emrax.com/e-motors/ These combined with an PT-6 based APU would certainly let ones imagation run wild configeration wise...
  3. Mad MAC

    Green hydrogen, fireproofing envelopes, and aerostatic lift for long-range/duration VTOL operations

    If you want to consider decarbonisation, the best answer is electric trains, you just write a check and you know its going to work, anything else isn't off the shelf (well no one wants a clipper). So if you want decarbonised aviation, you got to start with the most efficient thing that already...
  4. Mad MAC

    New Ownership At Hartzell Raised Prices Within One Month

    I would add Over worked and under resourced Design office: sufficiently optimized within available resources.
  5. Mad MAC

    Green hydrogen, fireproofing envelopes, and aerostatic lift for long-range/duration VTOL operations

    For all those plotting the use of sea anchors, consider that the "Mass" of the airship is 3 x the total weight of the airship due the mass of air it drags with it. Docking loads are yet another complexity quite different of your typical fix wing operation.
  6. Mad MAC

    Boeing - Design Issues...

    This is going to be interesting, I also see suggestions of multiply uncommanded rudder inputs.
  7. Mad MAC

    Green hydrogen, fireproofing envelopes, and aerostatic lift for long-range/duration VTOL operations

    I use to work with a a former chief engineer of an airship program his comments on hydrogen were between Hydrogen being explosive in mixes of something like 5% to ? (can't faintly remember the number) and the difficultly in preventing leakage, hydrogen was a no go well atleast for manned ops...
  8. Mad MAC

    MOSAIC Rule Change

    Ones company's has got to be a lot more competent to make the same net margin on 40 1/4 million aircraft as 10 million dollar aircraft and no one wants to compete against a competent organization.
  9. Mad MAC

    New Zealand

    I will second Mandeville for its 1920's and 30's biplanes although its pushing 20 years since I was last there (remember walking around the workshop playing guess the airframe of the metal tube frames stashed all over the place). Its probably getting late in the season but for mountain...
  10. Mad MAC

    New Zealand

    Warbirds over Wanaka is on over Easter weekend.
  11. Mad MAC

    Keyed/splined oleo strut?

    Keyed or splined can also be a machining op issue as well. Round can be plasma sprayed, chrome plate etc and then ground to final size, splines not so cheaply. There is always the 4 bar link mechanism like the Hawker tempest, but that's not likely to save any volume.
  12. Mad MAC

    FAA Advises Using Analog NAVAIDS In Spoofing Areas

    https://blog.geogarage.com/2021/04/the-us-navys-new-unhackable-gps.html This would suggest that if we can get hold of quality public satellite position data, we can just track the satellites instead of stars, which would possibly make a civilian astro-inertial navigation system practical (in...
  13. Mad MAC

    Human CG position relative to seat

    My thoughts would be does it matter. Most actual aircraft's weight and balance is marginally accurate at best, why because people struggle with the processes, time requirements, the math and record keeping required, plus aircraft gain weight doing literally nothing and that's just the empty...
  14. Mad MAC

    Cooling Glass Draws Cold Air from Space to Cool Buildings

    I see they don't note how they are going to stop the IR radiation in winter, not even the darkest hole in Alaska gets to 3 degrees kelvin.
  15. Mad MAC

    Iranian F14s still flying

    The difference between the F-111 program issues and the F-14, was that in the time between the two programs was the availability of welding of titanium for the wing pivot structure in the Fuse, as apposed to the rather unpleasant steel that was used in the F-111. I doubt that the Irans are able...
  16. Mad MAC

    Iranian F14s still flying

    That welded titanium structure (was noted by a Project Airforce study) is most the reliable / minimum repair effort material you can use in aviation, probably goes a long way to keeping the F14 alive. Replicating parts or fitting alternatives is likely not the hardest problem, its the ensuring...
  17. Mad MAC

    Why is GA continuing its demise?

    GA is dead, long live GA. I agree that better roading is having an impact, but thats only one part of GA. That still leaves the motorsport aspects (sailplanes, STOL drags etc), and the aircraft equivalent of kitcars and hotrods all of which is ticking along quite nicely (with the odd speed...
  18. Mad MAC

    What About Laser Cutting Other Materials?

    I have encountered laser cut steel fittings at resulted in holes too hard to drill to final size without significant issue aka they had to use drill bits much more expensive than the usual HSS drill bits (think the steel was 15CDV6), so probably anything heat treatable could be an issue should...
  19. Mad MAC

    Gipps Airvan Founder Buys Back Company

    There is not insignificant cost to GA manufactures in this class due to operators treating mandatory SB's as not required, mainly from reputation damage and supporting the resultant accident/incident investigations and it driving regulators to require even more mandatory SB's or issues...
  20. Mad MAC

    Gipps Airvan Founder Buys Back Company

    The GA-8 is basically a highly evolved Piper Pawnee wing and power plant installation, and its competition is around the Cessna 207 class. A turbine version would use a C250 (basically it would be just the GA-10 engine install on the GA-8. If one is in the price point of a Kodiak, there is a...
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