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  1. SpainCub

    CL max at stall.

    Howdy all, it’s been a while… I was looking at some of the data I have collected in the ~3K hour I have been flying my Cub. On it, I can see that I can consistently land my Cub at around ~32mph airspeed, since most of my landings have been at 900ft elevation… I was trying to see how well I did...
  2. SpainCub

    Luscombe Model 8 Wing sing strut design

    Hi All, I have been looking for the Luscombe Model 8 Wing, and I have read that the used a truss inside the wing, basically trying the two spar together and connecting the single wing strut to it at about the 30% of Cord. But I have not found a single image to have a peak how they accomplished...
  3. SpainCub

    Aircraft extrusions

    Hello, I was in the mist of working on my wing design, and working out different spar layouts... but then it daunted, there must be some sort of standard in the industry? So I searched the internet... looking for Aircraft Extrusions... and there was a hint that there is a Tiernay Metals...
  4. SpainCub

    Put me out of my misery... help with Riblett GA foils.

    Hi all, So, I had all these XLS open... had created one for quick NACA/Riblett ordinate creations... but I just messed up... saved another file on top of it and boom! it's all gone. Quick question, when I do type the Stations, different distributions, and mean lines... how do I get...
  5. SpainCub

    A lighter wing design, will all metal wing be design to way less than fabric covered?

    Hi all, Been toying (more like climbing a steep learning curve) with the idea of building a lighter wing for a popular class of airplane... with the addition of a new design as far as airfoil is concerned. Well, the initial thought was go composites for a design... I finally concluded that a...
  6. SpainCub

    Design review of the Dragonfly

    Hi all, I'm considering getting into a Dragonfly after seen some amazing flights form this very capable design. Looking at it on images, a quick question came up, how is the boom attached to the main stringer that caries the landing gear? Thoughts around this design are welcomed. Thanks
  7. SpainCub

    what if? increasing dynamic pressure over a wing, we could reduce AR=lower drag=effic

    Hi all, I thought I put out a thought provoking question. Reading McLean's "Understanding Aerodynamics" I had a thought (and before any asks, ganja is not legal in Spain, I never smoked, nor do intently break the law :gig: ) I came up with the following. If one places small propellers along...
  8. SpainCub

    STOL/VTOL Or close to VTOL design.

    Wow, I had been keeping an eye on this project for a while now, since I am involved in one very similar for a competing platform... for my personal use :giggle If we can only get batteries for a density of say 6000W-h/kg we could soon be flying in things like these... (soon?) Here is...
  9. SpainCub

    Interesting idea for making wings?

    Well, looks like rag cover wings are about as light/strong as you cam mage wings. Jarno has done an amazing job (and tank you for sharing it) putting together a wing with a weight/strength ratio utilising composites and fabric covering. I was thinking to my self, well if I could make composite...
  10. SpainCub

    Electric VTOL?

    Looks like someone is "claiming" to be building a functional prototype... Sorry, the image applet did not allow to retrieve it locally.... Here is the full scoop. Invention Awards 2014: A Personal Electric Airplane That Won't Need A Runway | Popular Science
  11. SpainCub

    How to gather data on a flying wing?

    Hi all, I am looking to gather data for a flying airplane. I'm able to currently gather data (albeit crude at the moment) for CP along the chord. My plan was to divide a wing in 6 stations and place probes at 5,10,20,25,30,40,50,60,70,80,90% of chord. I was thinking of building up pipes to the...
  12. SpainCub

    Can we take away anything for F1?

    Hi all, F1 season is coming up and it's going to be an interesting start... but lets get back to our little airplane... I have been pondering on the ideas for wing tips and how to improve Cl at low speeds, and I was considering a wing tip that is essential a vortex fence, meaning that I can...
  13. SpainCub

    Fieseler Fi-156 help needed. Rib+slats drawings

    Hi all, Quick question, anyone point me in the right direction to gain access to reference material for the original Fi-156 wing ribs data? I can live with a picture and a referenced object in it... like a coin or a ruler. Here is the background on my asking, during a takedown of the local...
  14. SpainCub

    Post cured CF bonding.

    Hi all, I have read here and elsewhere that it is best bond pieces of CF before curing. Some times this is not possible, but looks like everyone disused that this is not a good process. I tried looking at youtube for ideas and I came to this video: Looks like they are actually doing this with...
  15. SpainCub

    Wood sources in Europe roll call...

    Hi all, Can we get a list of sources for Air Craft grade Wood in Europe? I know that there is lot's of builders in France/Switzerland/Austria that all claim to have local sources, but I can't seem to find them. :whistle: Can you share contact details for companies you dealt with? That would...
  16. SpainCub

    Critic my Spar idea, also help finding a source for the parts needed.

    Hi All, I have been thinking about building a Box Spar that is both Composite and Wood. Here is is what I am considering that would like your feedback on. I was hoping to originally build a box spar made of all composite, but the cost and the weigh savings weren't all there by the time I...
  17. SpainCub

    XFLR5 and data file

    Hi, I just download XFLR5 and this nice piece of SW, but I can´t figure out why I can´t get my airfoil plotted correctly. here is the dat I am using: 0.0000000 0.0000000 0.0125000 0.0239000 0.0250000 0.0335000 0.0500000 0.0476000 0.0750000 0.0589000 0.1000000 0.0669000 0.1500000...
  18. SpainCub

    New lightweight 120 hp engine?

    Hi, I came across this article on EAA experimenter Experimenter - February 2013 and ti looks like first unit is rated at 120hp and 176 lbs. I could have sworn that this looks like a motorcycle engine, and I had a brochure of this engine searching for a power plant for a different project, but I...
  19. SpainCub

    Dual Spar calculation for cantilever wings. (new-bee question)

    Hello all, I am contemplating deviating from the design for a set of plans that I own for the spar. The plans call for solid Spruce for F.Spar and R.Spar, and I am considering an I-Beam spar design to save about 10lbs from each wing, while also incorporating new material for my build that...
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