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  1. I

    Ducted fan aircraft

    Here is the latest episode on my project. There are two new episodes up. There is an explanation of the landing gear, 3D printed manifold is done, exhaust flanges, general madness.
  2. I

    Ducted fan aircraft

    For those interested in my ducted fan project, we are going to try and do one YouTube spot a week.
  3. I

    Ducted fan aircraft

    I said I would report progress here at the begining of the year on my project, GT-1. Not much to show right now as I am still on a massive CAD and drafting bender as I work through the systems and draft out lamination sequences and assemblies. A bit deep for a one off but it is all part of the...
  4. I

    Horrible news from Vans Aircraft

    Clearances on punch press tools are a function of the material thickness you are trying to punch. The light gauge aircraft sheet stocks do not require large clearances. It has been a while since designing for and programming these things but as I recall for light gauge AL the clearances are just...
  5. I

    Here we go...Synergy still NO FLY and lighter...

    I see this problem at the day job almost daily and it comes down two a couple of factors with respect to both CFD and FEA. The first problem is the computational power necessary to model non linear relationships in complex assemblies. Most of us don't have access to it. We have FEA analysts at...
  6. I

    Here we go...Synergy still NO FLY and lighter...

    I really don't know any more about their code beyond what he told me, which I put in quotations. He didn't indicate that there was any difference in the boundary condition modeling from the basic to the premium run. We decided that for my project, which has similar need for long runs of laminar...
  7. I

    Here we go...Synergy still NO FLY and lighter...

    I have had a discussion on the topic of laminar boundary conditions modeling in air shaper with the founder: "We use wall functions to model what happens close to the wall (instead of using prism layer cells) and for that, we assume attached turbulent flow (without any transition model)." This...
  8. I

    Ducted Fan Pseudo-Jets

    I have been looking at other options. A 2liter I4 will fit but would require a different shaft arrangement. It would be a couple of CV joints. The wankel packages with a strait shaft and gubios. But that is next year's elephant to dance with. I am dancing with ALL the elephants...just trying to...
  9. I

    Ducted Fan Pseudo-Jets

    No problem. I will toil in obscurity until there is something that looks like a complete airplane and then I will start sharing. I think I can get a full set of parts pulled by the end of Christmas break. Can your ECU run a two rotor?
  10. I

    Ducted Fan Pseudo-Jets

    Yea Ross, that was me. Project is now completely tooled (molded). That took the last 3 years of weekends. My background is as a professional aircraft builder and composites technician in my early years, leading to a solid career as a mechanical designer in aerospace optical systems. I also...
  11. I

    The Fastest Single Engine Turboprop in the World

    He has to cool it on his 7 figure airplane builds to build a 7 figure house. He has a wife....
  12. I

    Thoughts on Composite Strut Braced Wing...

    I recall a wing rib with a 2 ply 3k carbon airfoil structure supported by a truss system of .030 carbon rod. The rod was laminated into the outer structure in the bag, being placed between the layers at the nodal points of the truss. It would be difficult to build a lighter rib then that. There...
  13. I

    BD-5 - Why is it so engrained in our psyches?

    It isn't a BD design. It is a clean sheet design of my own but it does have a somewhat similar configuration. It has a 16 ft nominal span and is 17 with tips so it is very short winged. About 17 in length. Two seats in tandem, the rear passenger is slightly higher by a couple of inches...
  14. I

    BD-5 - Why is it so engrained in our psyches?

    Jim Bedi was the Pied Piper of our little niche of the world. We all wanted to believe.
  15. I

    BD-5 - Why is it so engrained in our psyches?

    That would have been 1996. We were there with the 540. That was a monster build. We went from an empty airframe to Dave flying strait to Oshkosh in a month and a half.
  16. I

    BD-5 - Why is it so engrained in our psyches?

    Yes. This is what I was remembering and I recall walking around Oshkosh in the late 90s (I was working for Berkut at the time and we were there for the show) and running into someone who had put money down on a BD12. I had to break the news to him. He had no idea.
  17. I

    BD-5 - Why is it so engrained in our psyches?

    https://en.m.wikipedia.org/wiki/Bede_BD-12
  18. I

    BD-5 - Why is it so engrained in our psyches?

    https://en.m.wikipedia.org/wiki/Bede_BD-12
  19. I

    BD-5 - Why is it so engrained in our psyches?

    It was the Bede 12 and 14 I am remembering.
  20. I

    BD-5 - Why is it so engrained in our psyches?

    Exactly. I recall that there was a plan for a factory and plastic outer body panels and a steel cage. It all imploded.
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