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  1. Andy_RR

    Beta Technologies Alia

    Interesting interview with the founder, Kyle Clark, although the clickbait thumbnail is a bit sad...
  2. Andy_RR

    Minimum drag just prior to flow separation?

    An interesting article here alleges that minimum drag occurs just prior to flow separation - presumably meaning skin-friction drag. https://www.aa.washington.edu/news/article/2021-02-17/new-law-physics-finds-sweet-spot-aircraft-efficiency Paper is here, which I haven't read yet. Something for...
  3. Andy_RR

    Burt's yarns.

    I don't know if many of you have seen this or if it has already been posted here, but this is quite an entertaining series of videos from Burt Rutan. https://www.youtube.com/playlist?list=PLdU9dwAKJIAMDb31yFNyAM8uD0w966thA
  4. Andy_RR

    100% Scale Hawker Typhoon

    Well, built around a data plate, it seems. I stumbled across this on the Youtubes and thought that, while it's not bleeding edge tech, it's a super interesting series even as it stands now and there's been some really interesting nuggets of historical airframe technology discussed. Some of you...
  5. Andy_RR

    Inverted Capacitive Vorticulator?

    No, I have no idea either...
  6. Andy_RR

    Lycoming Crankshaft Weights? - Any data to hand?

    Does anyone have any data on the mass of the cranks for Lycoming engines (or Continentals)? Anything would be a good thing and appreciated if you know the engine spec. Doing some benchmarking of a CAD model at the moment.
  7. Andy_RR

    Dale Klapmeier on his Cirrus journey

    Worth a watch for very many reasons, if partly just for the quick tour of the Cirrus aircraft factory to see aeroplanes in the nude!
  8. Andy_RR

    A plane like Alice...

    I rather like this effort. I admit to being a little skeptical when all that was released was some dodgy renderings but this is impressive. The press conference at Paris was pretty credible too.
  9. Andy_RR

    Never mind Raptor. Perhaps this is how innovation should be done...?

    I keep seeing this pop up from time to time in my various social media feeds and think it is cool as! I think it has more going for it than a canard design and the fact that it's all so secret squirrel makes it more interesting, exciting and better for engineering decision making. Does anyone...
  10. Andy_RR

    LAK Genesis 2 - what's it like...?

    I stumbled across the Genesis in a few posts here and elsewhere and it looks kind of interesting for a design but doesn't seem to have capitalized on it from a structural weight point of view compared to other 15m class sailplanes. Is there an obvious reason for this that I'm missing? Apart...
  11. Andy_RR

    3D printed moulds - this must be in the future for homebuilt composite airframes...?

    Well, if you can do it for wind turbine blades, why not wings and fuselages...? https://www.3ders.org/articles/20180427-sandias-first-3d-printed-wind-turbine-blade-mold-wins-national-technology-focus-award.html
  12. Andy_RR

    Modeling propeller inflow in CFD

    Hello all, I have a pusher design I want to run some CFD on (OpenFOAM) but the propeller disc forms part of the (hoped for) aerodynamic flow patterns to minimize drag/separation at the back end of a Goldschmied body and so I am hoping for a relatively simple way to estimate the flow field of...
  13. Andy_RR

    Honda GX-based aero engine (completely crazy nutter content!)

    The crazy man in my head has escaped from the asylum and is running around with the idea of making and engine based on Honda GX-series engine parts. Now the premise is that these engines are so ubiquitous that future parts availability is probably as guaranteed as the IC engine, not to mention...
  14. Andy_RR

    Flow visualisation - how is this done...?

    Possibly risky link The winglet in the above link has by some process been coated with something to allow the boundary layer flow regime to become visible and presumably fixed for a certain flight condition. Does anyone know how this is done and with what materials, processes and methods?
  15. Andy_RR

    Hinged/articulated airfoil CL/Cd data?

    Does anyone have to hand any papers, NACA reports etc that describe or illustrate how to calculate/derive CD/CL data for a symmetrical but hinged airfoil section - i.e empennage. Not looking to be too fancy, but researching a aerodynamic/kinematic model for an autopilot pitch controller...
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