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  1. S

    Dynamic Stability Help

    We were shown both methods found in Nelson, but we never really used the approximate methods. State space modeling was learned from day 1, so that was the method we used for solving problems. Converting to transfer functions (and vice versa), drawing root locus, bode and nyquist plots (by hand...
  2. S

    Dynamic Stability Help

    Both books are worth it. I used Nelson's book in my stability and control class, and Roskam's books were also highly recommended. This was on top of our class notes. I would recommend getting both volumes of Roskam, as he references the first from the second volume. In the first volume he...
  3. S

    Electric Controls?

    Yes. I guess my reply was a bit simplistic. It was an impulse.
  4. S

    Electric Controls?

    Correct, I should have been more careful with my wording. I prefer heavier sticks too. Its the first thing I adjust when I get a new controller.
  5. S

    Electric Controls?

    Its how R/C planes are flown. There is no feedback through the controller. The servos move linearly with the movement of a stick, or in more complicated radios you can setup response curves in software. Servos have their own feedback hardware and follow whatever the input signal tells them to...
  6. S

    Electric Controls?

    My understanding is that the airbus sidesticks do not have feedback other than springs. Here is some info on the airbus FBW system Airbus Flight Control Laws SKYbrary - Fly-By-Wire And since shuttle orbiter was brought up, here is a neat paper outlining the development/testing process for...
  7. S

    Why not roadable aircraft

    Stabilized mounts with brushless outrunners as gimballs have really impressive performance, compared to stepper or servo types. These videos are from the zenmuse mount, for example. https://vimeo.com/75904067 DJI Introducing S800&Zenmuse Z15 - YouTube And amateur setups. Brushless-Gimbal -...
  8. S

    Why not roadable aircraft

    One of these I would think, or something like them.
  9. S

    Variable geometry using bent carrots?

    Yeah, silly them wasting money on aerospace research. I think this might be similar to your 'bent carrot'. They're used on RC gliders to hide aileron linkages in the wing. Rotary Aileron and Flap Drivers Numerous research on morphing or adaptable wings. Lots of university projects too. Pilot...
  10. S

    Validity of scale model tests

    Interestingly, a presentation by Joe Chambers has just been posted to youtube. He specializes in scaled free flight testing. Its not a technical talk, but the book he wrote has a number of references that might be useful. In the middle of the talk he goes into the design of spin chutes. Might...
  11. S

    Ground testing in the open a full sized airplane instead of wind tunnel testing

    Rutan describing his scale testing of the VariViggen. https://www.youtube.com/watch?v=OzYPaWMI-do&playnext=1&list=PL0DDF769D8545D616&feature=results_video
  12. S

    Corsair/Spitfire hybrid

    Lots of good info in those threads. I think Orion summed up the idea in this post https://www.homebuiltairplanes.com/forums/general-experimental-aviation-questions/4953-r-c-model-prototype-test-methods.html#post36087 I would argue that with the cheap sensors and off the shelf data loggers we...
  13. S

    Corsair/Spitfire hybrid

    I don't know about everything on the market, but I've been playing around with an ardupilot. The version I have is the older one with a daughtercard (apm2560+oilcan). It has a 3 axis gyro/accelerometer, gps, pitot, magnetometer, barometer, and I think 3 more adc ports for other sensors. The...
  14. S

    Corsair/Spitfire hybrid

    Be mindful of the Re that your tail will fly at. Most R/C planes, even larger ones need a larger hstab than full scale for low speed control. Whatever airfoil you choose, don't expect a Cl of much over 1-1.2 clean. With a gyro/accelerometer, pitot system and servo logging you can produce strip...
  15. S

    Flow visualisation - how is this done...?

    Yeah, I don't know what oil is used, but oil flow is used a lot in the wind tunnel and to get an idea of what is happening in flight. Wainfan has an example from wind tunnel testing http://www.wainfan.com/wingdes.pdf From page 39 on. A few years ago when F1 banned testing, you started to...
  16. S

    X-Plane / Plane Maker

    Of course it does How Can I Model An All-flying Tailplane In Plane-maker - Aircraft and Panel Development - X-Plane.Org Forum Doesn't matter if its the demo or not. Plane maker and airfoil maker are not limited in any way in the demo. That would be a good way to go about it, as working with...
  17. S

    My aircaft design for the community

    Dayton Wright RB racer Its hanging up in the Henry Ford museum. The windows are some form of plastic, to see forward the pilot would push his head against them and they would bulge enough to see forward (at least, that is what the plaque says). Also sports leading and trailing edge flaps...
  18. S

    How many layers of glass, kevlar, carbon when foam is not used?

    The owners manual in the RAF cd (long ez, second edition, Oct. 1981) has a 190knot demonstrated redline.
  19. S

    Flying wing for high efficiency

    The idea is that engine cores are getting smaller, while fan ratios keep getting larger. Core thrust will be negligible compared to fan thrust, so why not separate the cores and fans. Put the cores on the wing tips, or anywhere really, and bury the fans in the boundary layer. You can see more...
  20. S

    XFLR5 Stability Analysis

    Short period and Phugoid are the 2 lateral modes of aircraft. Short period needs to be heavily damped, as the high frequency can be a problem. Its usually damped out completely in a few seconds, and isn't really noticed during flight. Phugoid is the long period mode and is lightly damped. Can...
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