• Welcome aboard HomebuiltAirplanes.com, your destination for connecting with a thriving community of more than 10,000 active members, all passionate about home-built aviation. Dive into our comprehensive repository of knowledge, exchange technical insights, arrange get-togethers, and trade aircrafts/parts with like-minded enthusiasts. Unearth a wide-ranging collection of general and kit plane aviation subjects, enriched with engaging imagery, in-depth technical manuals, and rare archives.

    For a nominal fee of $99.99/year or $12.99/month, you can immerse yourself in this dynamic community and unparalleled treasure-trove of aviation knowledge.

    Embark on your journey now!

    Click Here to Become a Premium Member and Experience Homebuilt Airplanes to the Fullest!

Search results

Find deals on ebay
Find deals on amazon
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
  1. WINGITIS

    Achieving The Best Reflexed Airfoils for Flying Wing use in the Small Plane Categories

    Yes but as soon as you have an AOA that changes, the static margin has changed, all your moments and weights and angles of items are now OFF in relation to the ideal, the COG is moving around, fuel slosh etc etc. When your XCp varies greatly that also has an effect, so the pitch axis for your...
  2. WINGITIS

    Achieving The Best Reflexed Airfoils for Flying Wing use in the Small Plane Categories

    OK but what perhaps we are not understanding, or I am not, is what a -15% SM on say Option 1: The plank, actually looks like in terms of an airfoil that then has to both change speed and AOA and do those in combinations of Climb turn etc and what the stability margin does then? Does it get...
  3. WINGITIS

    Achieving The Best Reflexed Airfoils for Flying Wing use in the Small Plane Categories

    Ok seeing as your using Xfoil lets get it so our graph outputs are the same.... Your Mach is not set, this makes a difference and does more closely match CFD results. https://sourceforge.net/p/xflr5/discussion/679396/thread/ece0a016/ Also you can set the trip to be anywhere you want on both...
  4. WINGITIS

    Achieving The Best Reflexed Airfoils for Flying Wing use in the Small Plane Categories

    I assume he means he is trimming for level flight at that 0.3 CL with a -15% SM, which is at 1 degree AOA for his configuration, discounting the center section. So regardless of that, the trim still changes a lot with AOA and speed changes with that airfoil and the tip and the root have...
  5. WINGITIS

    Achieving The Best Reflexed Airfoils for Flying Wing use in the Small Plane Categories

    Thanks for that I have downloaded it. There are also various Airfoil DAT files for those interested, just underneath the English version of the book. https://drive.google.com/drive/folders/1lt2KWsBWQwZtNgNkYSlXz7_PoV5HHYKF
  6. WINGITIS

    Achieving The Best Reflexed Airfoils for Flying Wing use in the Small Plane Categories

    Look forgive my scepticism but in the example data you gave the chords, speeds and Reynolds numbers didn't even correlate, so perhaps you can show us your CMvTRIM plots at the -15% static margin that you intend to use, especially how that will vary with AOA!
  7. WINGITIS

    Achieving The Best Reflexed Airfoils for Flying Wing use in the Small Plane Categories

    I recommend you get the Marske book(The wing and I) create/aquire his airfoils, Positive CM, run the analysis and see how it works out........ Same with the Horten airfoils etc etc. Aiming for a single level flight cruise with poor AREA under the CL/CD AOA Polar will not be good for climb out...
  8. WINGITIS

    Airfoil selection for an aircraft out there?

    You are correct, its not possible to generalize about a series of airfoils, of any type and apply them without analysis at a speed and reynolds number reflective of what is being built. For instance the issue with a 23012 nose under curve is not present to the same extent on the 23015. Other...
  9. WINGITIS

    Achieving The Best Reflexed Airfoils for Flying Wing use in the Small Plane Categories

    A more practical reflexed version is included here, only a small loss in performance for a large change in CM positioning. As usual a tradeoff but better than trimming Aileron's or Elevon's up to get trim with its associated drag penalty.
  10. WINGITIS

    Formula-I?

  11. WINGITIS

    Achieving The Best Reflexed Airfoils for Flying Wing use in the Small Plane Categories

    Further to this as the original airfoil was not reflexed I took its thickness distribution and applied it to a reflexed camber line to get the CM curve closer to zero. That increased the camber so did not loose all the CL that reflexing normally would, however that distribution reflexed whilst...
  12. WINGITIS

    Formula-I?

    Yes, this MC30 seems to be useful for cruise flights as well, not longer range speedy ones that's all, a task Industrial powered devices are not suited to.
  13. WINGITIS

    Formula-I?

    There seem to be plenty of MAX models to chose from, what is the difference between the 1300 and 1600?
  14. WINGITIS

    Formula-I?

    There are all sorts of existing designs that are possibilities or inspirations for mods or new designs. Many plans and lots of information in here.. https://www.ultraligero.net/ingles/index_i.htm An example.. There are a few in NZ. They look a little more sporty than a Hummelbird, in my...
  15. WINGITIS

    Formula-I?

    Yes weight will be a big factor, but assumably there is to be a minimum weight folks cannot go below! Also how much lift ones fuselage contributes in the turn will make a difference, some may make none at all.....
  16. WINGITIS

    Formula-I?

    OH right Cockpit forward, different tail, less span...! Thanks for that. I like the LOOK of the Baby more!
  17. WINGITIS

    Formula-I?

    ?? These are documents from that time, So whilst Wiki and more modern publications and websites could be wrong as well, I am not understanding. The plans in the link are very detailed and look the same...
  18. WINGITIS

    Formula-I?

    Ive saved the black and white portion and aged it a bit more(ATTACHED) If we want to use it on a website in the future or anything the owner would need to be contacted first as its his original work. RENAMED WITH TIGER TIM'S CORRECTIONS:
  19. WINGITIS

    Formula-I?

    Well then you might as well spend time looking at the whole article then as another poster has asked and I sent him the link. https://archive.org/details/FlyingAndGliderManuals19301932/page/n151/mode/2up The download for a PDF version is toward the bottom on the right. The pages are in...
  20. WINGITIS

    Formula-I?

    For RUMinating......about that next prop configuration change! Attached is the Baby Bullet propeller details.....
Back
Top