Recent content by LBarron

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  1. L

    Question for Fauvel / Plank Enthusiasts / Experts

    That photo is one of about a dozen construction photos from the Yahoo Groups France site "aile volante pélican wampyr" (flying wing pelican vampyr) https://fr.groups.yahoo.com/neo/groups/ailevolante/info
  2. L

    Ducted Fan propulsion

    Thanks. A little more elegant than my aluminum blade, wood/fg stator test fan. I like it.
  3. L

    Ducted Fan propulsion

    Beautiful. Nice work! I'd love to see some pictures of the fan if possible.
  4. L

    Hi Mark, I sent you a PM instead of a message here - got all the words in one post!

    Hi Mark, I sent you a PM instead of a message here - got all the words in one post!
  5. L

    Hi Mark, Start reading from the bottom post!

    Hi Mark, Start reading from the bottom post!
  6. L

    Are you following the French P/V Yahoo group? Unfortunately the one person who was building one...

    Are you following the French P/V Yahoo group? Unfortunately the one person who was building one gave up because it was too heavy. He didn't fully explain so I don't know if it was too heavy for the engine/power or too heavy for European regs. Shame, I was looking forward to his progress...
  7. L

    So, I did a bit of a redesign using the Fraser F5 13% airfoil and the stability and trim...

    So, I did a bit of a redesign using the Fraser F5 13% airfoil and the stability and trim characteristics are just perfect for an ultralight with a 60 mph max speed. The airfoil Cm is almost zero so it's easy to balance out the moments over the speed range - max elevator deflection is less than...
  8. L

    Hi Mark, I gave up trying to analyze the Vampyr given what I saw in the plans. One thing...

    Hi Mark, I gave up trying to analyze the Vampyr given what I saw in the plans. One thing that really puzzled me was when I put the airfoil coordinates into several different programs the results always showed a negative pitching moment - surprising because of the reflex TE. But then...
  9. L

    slow loading

    I've noticed the same problem recently- just HBA, nothing else. Seemed to coincide with a Chrome "upgrade". I might try a different browser to compare.
  10. L

    Scale model for testing tips?

    This doc has some additional info to what was posted by cheapracer:
  11. L

    Ducted fan aircraft

    Steve, That picture of the blades and hub was from early in the project - I guess I should have noted that. The blades have some twist (root 34 degrees, tip 16 degrees) but camber really isn’t needed because the difference between the inflow and exit angles is relatively small (14 degrees at...
  12. L

    Ducted fan aircraft

    Dave, I started my ducted fan research years ago to design a better propulsion system for a Jethawk type airplane, so that would be the single seat experimental category. I think the whole unit would be too heavy for an ultralight. I've done a fair amount of design work on a smaller, lighter...
  13. L

    Ducted fan aircraft

    Hey Steve, I'm working on a ducted fan project right now and have made something similar to your idea - the rotor is made of several layers of plywood discs and the blades are aluminum. Each blade is secured by two bolts. I'm making a test rig to see if the experimental results match the...
  14. L

    In pictures: Oshkosh EAA Airventure 2014

    160 pictures of Airventure for your viewing pleasure: In pictures: Oshkosh EAA Airventure 2014
  15. L

    Fatal Loehle 5151 crash in CA

    The story >> Kathryn's Report: 06/21/14 The owner had just done his first test flight two weeks ago >> https://www.youtube.com/watch?v=o6gsvRT0TPY and https://www.youtube.com/watch?v=y0vAC7uVtn4 A few comments here from the Loehle Yahoo Group...
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