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  1. J

    Best Pour Foam? Locally sourcable?

    Looking to build fuselage modifications on my home built. Planning to use Pour foam, and possibly pink or blue foam from Lowes/Homedepot as pre cut ribs to help with shaping. What is the best type of Pour to use, and where would you source it? I know a lot of people use X-30 from aircraft...
  2. J

    Let’s talk Wing intersections and fillets

    I look up to and admire Mike Arnold, his designs, and his videos. He made me question a lot of general principles, and rules of thumb that circulate the aviation community. So, lets discuss wing fillets and intersections. I am going to do my best to keep the original post short, and expand on...
  3. J

    Lets discus TV

    Okay guys, we all know TV is a serious issue. Lets discuss current tech, and potential ways to resolve the problem. So, torsional Vibration can very quickly ruin your propeller, airframe, and engine. There have been numerous semi-successful one-offs and such that seem to have done okay. There...
  4. J

    Mike Arnold Company website?

    Hey guys, Im sure many of you have seen the videos that have been on Youtube that Mike Arnold recorded. As I heard, it was his request that those videos be shared with the public. Now, If I recall correctly, only about 6 or so months ago I recall there being a very nice "arnold company"...
  5. J

    Sailplane canopy linkage

    Hey guys, I am looking for detailed pictures, diagrams, and Ideas for forward opening canopy linkage. My goals are the ability to egress if it came down to it.* Many modern day sailplanes are built with a fancy linkage that allows the nose of the canopy to lift several inches before rotating...
  6. J

    Optimizing wing fillet on tapered fuselage?

    Hey all, I have been trying to wrap my head around something, and it seems like I am missing something relatively simple. Building a proper wing intersection fairing/fillet on a square fuselage seems pretty straight forward per Hoerner's study's. Is the fillet simply extended beyond that of a...
  7. J

    Optimizing Naca Duct/Scoop for Cabin Air

    Hey fellas, lets discuss optimum NACA scoop shaping and sizing for cabin air. I have found many templates, but they range in aspect ratio, depth, etc, quite drastically. What I am getting at is, what shape (contouring of the sides), and size (width, length, and ramp angle) could or would be...
  8. J

    How to tell what VW you have?

    I believe I have a HAPI 1835, but how do I know for sure?
  9. J

    Have we reached the end of the Steam Gauge era?

    Hello fellow builders! I have reached the point in my Dragonfly build that it is about time to start thinking about, planning (and saving) to outfit the project with avionics, instruments, radios, etc. The purpose of this thread is to kick off a discussion about the pro's and con's, of going...
  10. J

    Dragonfly owners and builders?

    Hey there HBA! I have been researching the Viking Dragonfly, and q200 for efficient, affordable, and quick commuter. I have found a few partially assembled kits/projects and I am considering taking one on as an undertaking. The idea being that it would be a good stepping stone before moving to...
  11. J

    Revisiting Mini-IMP, Vmax Probe style designs

    Hey guys, I have ventured into another thought experiment. (You may have seen my other). Neither of which are very serious at the moment as far as building the plane, however it isn't entirely off the plate in the distant future. So, Long story short I recently started revisiting the idea of a...
  12. J

    Tandem/Box-Wing for foot-launch glider

    So just for starters, this is much more of a thought experiment than anything. The idea is for a light weight, potentially foot-launched sailplane. The goal is to exceed the performance of those such as the Aeriane Swift, while maintaining the ability to fold, and be trucked with any other...
  13. J

    CRJ Winglets

    So wingtip design, has always been a fascination of mine. That being said, I always pay particularly close attention to wingtip design on essentially every aircraft that typically utilizes such devices (IE: Sailplanes, racing aircraft, efficiency oriented aircraft, etc.) So, this is a...
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