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  1. R

    Bf 109 Blueprints/Drawings Needed

    There's a whole scene of people gathering drawings of wartime fighters as a hobby in itself. They get them from museums and collections all over the world. Often they manage to get almost complete sets of drawings They share or sell them too. I would be amazed if they haven't done the 109 too...
  2. R

    A 55% SR-71 Blackbird under construction!

    I just bumped into this, never heard about it before: https://www.orange-aerospace.com/about-us/projects/scaled-lockheed-sr-71 Airframe production appears to be roughly halfway. Holy moly! I worked with the founders to build a few 5.5 meter span UAVs, some 10 years ago, when they were also...
  3. R

    Legendary Pilot Bob Hoover Flies One Last Roll Over Edwards in a Saberliner

    Talk about a gentleman! I had the pleasure of chatting with Mr Brown maybe 10 years ago. Very modest and kind. Rob
  4. R

    Roomy high wing options?

    What design is this? It looks like it has 'diamond in a square' frames, something I haven't seen before. Interesting! Rob
  5. R

    Wax in Resin?

    Yep, I agree with that. We sometimes added 1 or 2% parafin (the liquid variant) to polyester gel coat to make a 'top coat', a colored finish coat over a laminate. A polyester gel coat applied last over a laminate will not cure at its surface. The added wax comes to the surface and blocks the...
  6. R

    Wing spar sizing

    Found the manual online: https://apps.dtic.mil/sti/pdfs/ADA324952.pdf And apparently it was upgraded in 2003: https://www.tc.faa.gov/logistics/grants/pdf/2001/01-g-033.pdf Rob
  7. R

    Wing spar sizing

    Some 30 years ago I worked with 'FAR23 Loads' by McMaster. It consisted of a set of programs in Basic language, and one calculated the tail loads for a large number of conditions, all corners of the flight envelope and for several CG positions. I remember it used an iterative process to find the...
  8. R

    UFOs anyone?

    One comment on this book: it was edited quite badly - I think the first chapter was added by the publisher, which creates a false impression of what Corso actually experienced. Except for that confusing part, it's interesting reading, and explains why the neither the US presidents or the FBI/CIA...
  9. R

    DC 3 wing planform

    As in: there is no connection between the outboard and inboard shear webs? I long wondered about that, after seeing a dismantled DC-3. It seemed to lack any provision to connect the shear webs. I would be grateful if you can solve that old question! Rob
  10. R

    HE-162 information

    I have a webpage about that Me-163 replica: Mr Kurz' flying glider replica The builder had a set of 2500 drawings. But he changed the airframe from aluminum to wood, so it was a complete redesign. Rob
  11. R

    Mass Production of The Cheapest Airplane Ever

    That's just the work done on the assembly line - you're forgetting all the work done to manufacture the thousand of components! I don't have a figure for that, but it would be very interesting to know that. Rob
  12. R

    Anyone recognize this homebuilt? French design possibly

    Thanks you too for the confirmations! If anyone has an idea what can be done with the airframe, please post it here, I will pass it on. Rob
  13. R

    Anyone recognize this homebuilt? French design possibly

    Thanks all for the answers! I will notify the seller on what he has. Finishing it as a flyable homebuilt is probably not possible in the Netherlands, as far as I know the rules and regulations for homebuilts. Rob
  14. R

    Anyone recognize this homebuilt? French design possibly

    On an auction site in the Netherlands, a partially built wooden twoseater homebuilt is offered. The seller doesn't know what it is, neither do I :-) ≥ Vliegtuig van hout, ware grootte!! Lijkt type Bleriot xi — Modelbouw | Vliegtuigen en Helikopters — Marktplaats Anyone recognize this...
  15. R

    Sheet Alu Aileron Hinge

    Agreed! The molds were still in good condition after five sets of wings. But I discovered some problems, that happened before I got involved. The wing profile was calculated the wrong way, when they changed the thickness. Instead of scaling the thickness distribution, and adding that to the...
  16. R

    Sheet Alu Aileron Hinge

    I employed the same idea on a 5 meter span UAV carbon fiber wing, for both the flaps and ailerons. At the time I didn't know about the Heintz design, so it was experimental. Basically it worked well, and I loved the simplicity. The first photo shows the skin still in the mold, with the sandwich...
  17. R

    Wing lift distribution for structural analysis

    I'm going quite a bit outside my knowledge, but my first two answers would be a 'lifting line' model, and next a 'panel method' analysis. I never calculated either, but the first isn't that difficult to program yourself AFAIK, and the second is available in freeware I think. I'm excluding CFD...
  18. R

    A simple method to calculate loads on wing attachments

    Agreed. In all the wings I calculated the loads for, I always did a very rough check on the bending moment by putting all (or actuually half) the lift at 40% span. The values always matched closely. Rob
  19. R

    Absolutely Crazy Idea: Drone conversion

    IIRC, is was called the HH-1. It had the wing of a Teledyne-Ryan Model 147, a derivative of the target Firebee, with a 27 foot wing. Rob
  20. R

    Looking for an aerodynamic model (polar) of the F-84F Thunderstreak

    Thanks for the tips! I found one useful report on the NASA report server: NACA RM L57E17 'Time-history Data of Maneuvers Performed by a Republic F-84F Airplane During Squadron Operational Training'. It contains data of a few LABS manouevers, and it's roughly what I was trying to analyze myself...
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