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  1. jedi

    Inherent, quiet?

    I’m talking about 5 miles from the airport, well above a thousand feet, CAVU, etc. Of course when you need it use it but a Cessna 185 does not need max power on down wind over the apartments a mile from the runway. I am sure you know the type of pilot I am referring to.
  2. jedi

    Inherent, quiet?

    The most annoying noise, IMHO, is from the propeller of those annoying pilots that either forget or are not trained to retard the RPM control after liftoff. It is a very economical easy and effective solution to the excessive noise issue. Even I, a staunch supporter of aviation and low...
  3. jedi

    Inherent, quiet?

    The military actually investigated three designs IIRC.
  4. jedi

    Inherent, quiet?

    When one mentions quiet flight gliders automatically come to mind. However, gliders are not quiet. Are you wanting to research aerodynamic noise or more interested in engines and propellers? Electric propulsion is good for studying propeller noise and there are som interesting studies on that...
  5. jedi

    Just how fast was the SR-71?

    Hope you can get to it before it is gone. Let us know how it turns out. I find it hard to believe you did not snatch it up.
  6. jedi

    Ambi-Budd Werke flying car

    Yes. Things are happening with the Switchblade. I am still trying to understand the ramifications and will post more if I can sort things out and make sense of it. I suspect it is more of the same old story but it is hard to say for sure at this time.
  7. jedi

    Sport Pilots Association

    Is a Private Pilot without a medical certificate flying under Sport Pilot privileges considered a PP or a SP. The FAA records would show him as a PP but I would consider him a SP as that is what he is functioning as. Is an Olympic swimmer running in a Marathon a swimmer or a runner? I have...
  8. jedi

    Communication problems?

    I like ducks but I do not have any. I did have a duck once but she was eaten. Apparently that is a common issue with ducks. Don’t get me wrong. Potatoes are good too as long as you have something to go with them. Ducks are better in, my opinion, because the are useful even without...
  9. jedi

    Change.org: Urge the FAA to Address the Deficit of Ultralight Aircraft Instructors

    Congratulations! You all are finally getting on board with what has been available (almost) all along. Anyone can be a single seat Ultralight instructor. If you have an ultralight that can handle the weight and location of a second occupant the instructor (or student) can ride along if you...
  10. jedi

    Saving Ultralights From Being Banned

    I also suggest look for a private strip to house some ultralights and visit the public airport as good ambassadors. Show the public officials that you are not dependent on public facilities but that you support their use and limited growth. Limited in the sense that noisy fast and dangerous...
  11. jedi

    Rethinking Propellers?

    Can you tell us more about your experiment?
  12. jedi

    Laser detection technology ?

    Is there any possibility of a filter that would be very selective at blocking the green wave length?
  13. jedi

    Rethinking Propellers?

    The increase in power and the increase in vibration are two different items. A 2% increase in power can have a 10% (or larger) increase in vibration. Frequency is another variable that can have a significant negative effect. The problems are not necessarily at max power and or max RPM. The...
  14. jedi

    Rethinking Propellers?

    Electronic ignition (versus fixed spark advance of a magneto) allows for variable ignition as is commonly done in automotive applications. By varying ignition timing as a function of rpm and manifold pressure power output is increased along with the amplitude of torsional vibration. The...
  15. jedi

    Formula-I?

    “Formula 1” or “Formula I” Alpha or numeric? I thought that was covered back a ways and it was “I” for “Industrial motor”. If the concept is to keep the cost down it is logical for cost to be the primary limiting factor rather than power, displacement, rpm, restricted intake plates, etc...
  16. jedi

    Controller makes Incompetent pilot LAND for being hazardous!

    What’s the story. Where? Aircraft type? Pilot history? Results? Edit: https://www.avweb.com/aviation-news/controller-orders-172-pilot-to-land-for-being-risk-to-aviation-safety/?MailingID=FLY240219013&utm_campaign=avwebflash&utm_medium=newsletter&oly_enc_id=8797H7312967D1C
  17. jedi

    Making a boom, before Boom Aerospace - Messing around with breaking mach.

    You can see the diamond shock pattern to verify supersonic flow with a typical compressed air supply and air nozzle with much less fancy equipment. View the jet from the air nozzle against the backdrop of any highly contrasting linear discontinuity. The straight edge line of the typical...
  18. jedi

    Laser detection technology ?

    “ The cops just showed up at my house, explaining” I do not think there is anything in the city code that requires “cops” in pursuit of a criminal to tell the truth. That condition is reserved for the courtroom when under oath and even then is not necessarily binding. It least that is what I...
  19. jedi

    Foldable, collapsible structures

    In the early days the hobby jets did not exist. Installing screaming direct drive two cycle engine was the equivalent. That is what was done. I can pretty much assure you that anything imaginable was considered.
  20. jedi

    Foldable, collapsible structures

    Quicksilver wings and wire or strut braces “ladder wings” in general are removed (or folded) as a unit. An exception to this was the Fledging. Ladder wings have a leading edge and trailing edge spar separated by compression members. The Fledgeling somehow collapsed the compression members to...
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