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  1. T

    John Roncz

    Very nice gentleman. His mastery of 2D airfoils 3D aircraft was amazing. Helped invent full aircraft cfd optimization work.
  2. T

    So many reasons to use a P.S.R.U.

    I worked at Powersport Aviation from 1997 to 2007. I designed most of the custom parts of the engine and PSRU and designed the installation packages for several airframes. I did some of the TV testing under the direction of our engine design engineer (who earned his master’s degree using this...
  3. T

    So many reasons to use a P.S.R.U.

    Powersport Aviation engines made 215 hp compared to the 150hp or so that RWS installations have. The PSA reduction drive was also used on 3 rotor turbocharged engines in the 300+hp range. There were never any TV issues on the propeller end of any of our testing or installations even with high...
  4. T

    Electric Four Seat

    Solar is a distributed generation method. You make more or less where you use it. It is a significant contribution to solving power grid issues.
  5. T

    Vibration free powerplant.

    Could you fold this engine in half and make it into a vtwin with a single crankshaft and a head that connects the two cylinders forming the shared combustion area. Porting and single flow remain the same. The v angle provides the offset angle between intake cylinder and exhaust cylinder. Be a...
  6. T

    another Autoflight gearbox failure - this time after 34 hrs

    Possibly a shift of the part in the fixture during machining.
  7. T

    Feedback on DubCub ultralight design?

    Did you find the motor CAD model or is that your work from scratch, and are you willing to share that? I like the redrive design but it seems like a large amount of eccentric for a micro v belt. Could you get by with less?
  8. T

    Very low aspect ratio planes?

    Powered lift aircraft that do not need to generate large lift coefficient at low speed make great use of LAR wings.
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    Why not Aluminum tubing instead of Steel?

    if you happen to have access to a 9 degree of freedom robotic friction stir welder then this is a great way to build an airframe. Otherwise you have to design all joints to the annealed properties of the aluminum alloy you are using and they generally are poor. Adhesives with aluminum are very...
  10. T

    JMR Special, (Just Made Right) :)

    I like simple designs that address a need, very well done. I am a smaller guy so I don't mind that most airplanes are pretty small, but the penalty for making them comfortable is not real significant for low and slow fliers like this. Considering the size of most american men these days I am...
  11. T

    Interesting Aircraft

    I have always liked the Sgian Dubh. Have you flown it enough to get performance data?
  12. T

    Synergy Aircraft

    I spent much of 8 years doing simulation, wind tunnel testing and flight testing of the F-16 and YF-22. Wind tunnel testing is a much more controlled environment then flying models and the data collection system provides much more quantitative information unless you have a bunch of sensors in...
  13. T

    Wind Turbine Design

    Does anyone have experience with QBlade - Wikipedia, the free encyclopedia wind turbine design software or wind turbine design in general? I am designing a blade and learning how different then prop design it is. Any suggestions on using the xfoil file formats?
  14. T

    Hybrid tiltrotors/tiltwings

    no, a suction pump can only suck around 34 feet ( well really only 24 feet real world with pumping losses and friction) no matter what you do, The water is stretched until it bursts into steam. no getting around it.
  15. T

    Hybrid tiltrotors/tiltwings

    and terms like "meat gyro" etc have no relevance to the real world environment where you are lucky to even see a horizon in places like Beijing and even less so when amongst buildings or other obstructions to a line of sight --the Xombie demonstration of robotic VTOL probably has more to offer...
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    Hybrid tiltrotors/tiltwings

    Sorry Dana, but I still think you are mistaken. Risking getting way off topic here, I will just site the Feynman reverse sprinkler problem http://en.wikipedia.org/wiki/Feynman_sprinkler which was debated by physicist for over a hundred years. The end result was that there is very nearly zero...
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    Hybrid tiltrotors/tiltwings

    It is easy to "dismiss" out of hand the many serious and well conducted attempts at VTOL --including the Joby VTOL effort - as insignificant or just stupid etc I only dismiss out of hand ones that are stupid! Here is a phenomenal display of technology...
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    Hybrid tiltrotors/tiltwings

    Do 29 is an amazing plane for its time. Max weight 5,512 lb on 540 hp =10 pound per hp achieving a stall speed of 15 mph, and they never even rotated to full thrust deflection! With modern engines and structures I can get down to 6 pounds per hp with two people and below 5 pounds per hp...
  19. T

    Hybrid tiltrotors/tiltwings

    It doesn't matter where the engine is, but what does matter is the inlet floating (or otherwise supported) on the surface rather than just being a tube dipping into the water. This is an interesting idea. I think that a floating entry point does not provide support to a flexible hose or to the...
  20. T

    Hybrid tiltrotors/tiltwings

    Several planes have been very impressive throughout the years, several have been aero or propulsion investigative platforms with no real intention of being effective aircraft and several have been simply stupid. Learn what was meant to be learned from those (including that a particular idea...
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