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  1. C

    What airplanes have you flown?

    I guess someone will notice I'm from France :D Aquila AT01 Robin DR400 Cap 10C Dynaero CR100 Morane MS880B Rallye Lancair 235 Pottier 180 Jodel D150 Mascaret Jodel DR1053 Sicile Extra 200 Cap 231 Piel CP751 Beryl Lefebvre MP205 Busard Piper J3 Piper PA18 (on floats) Vans RV7
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    MOGAS in Fiberglass Fuel Tanks

    Hello all, I found this discussion very interesting albeit kind of depressing when I started looking into making fibreglass tanks for my airplane, because suddenly everything I had planned seemed to be ill-advised. But lacking some definitive results and numbers on fuel resistance of various...
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    Buffalo air gauge

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    Buffalo air gauge

    Looks like a free air temperature gauge to me, although the FAB marking puzzles me.
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    3d printed variable pitch propeller mechanism

    Hello all, A few months ago I stumbled across the patent papers for an interesting system, purely mechanical (no hydraulics or electrics), for a variable pitch propeller. It was designed by Robert Stanley in 1935 and a version of this was used in the Curtiss Turboelectric propellers of the...
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    EAB "Hall of Fame" Designers

    I'll add Paulo Iscold to that list, as I haven't seen him named before, and even though he doesn't design for the ”general public” of amateur builders, his accomplishments speak for themselves.
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    Kuhn's Diagonal Tension Factor

    I remember a lot of Kuhn's work made it into Bruhn's textbook in the chapter about diagonal tension (chapter C11 IIRC). It was also completed by an addendum/errata published later. You might find more readily applicable explanations there.
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    Porco Rosso

    I see "a bit" of Nardi Riviera. At least for the twin boom part.
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    Limit vs ultimate load

    Scenario 2 is the normal understanding in the industry. I would even say : 4.1G -> some yield is acceptable. Some designers take large margins but not all do, so unless you checked the stress report yourself, don't assume they did. No plastification (yield) is allowed before LL (let's say 4G)...
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    Classic fuselage designe but in carbon fiber tubes?

    Hi, Such a design has been built by Thierry Pujole in France a few years ago, called the Agrion : http://www.ulminimalist.sitew.com/#Projet_minimaliste.B The carbon fibre tubes are bonded/tied together using a carbon fibre wrapping:
  11. C

    39th Western Workshop of the Experimental Soaring Association, div. SSA

    Hi all, I don't know anything about the regulations in the US concerning glider towing, but in France it is possible to tow with amateur built airplane and even with ultralights. The aeroclub where I fly airplanes has a large glider section and they are towed using either an ACBA Midour 3...
  12. C

    Alternatives to spruce in wooden aircraft construction?

    Ash is good for highly loaded parts but not for long stiffeners. It is especially very good in compression across the grain and in bearing (so ideal for a bolt going through). It was used on the Stampe for the front of the fuselage longerons, scarfed with spruce at the back. I think this was...
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    Carbon fibre

    Also be careful with material interactions. Aluminium cannot be in contact with carbon without having galvanic corrosion problems, so a lot of people who use carbon fibre rods use stainless steel inserts at the ends for the rod ends, which end up being just as heavy as an aluminium tube with...
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    Euro Fly-in Blois 2012 - GREAT video

    The fly-in in Blois was always great. Later ones in Vichy were unlucky with weather but last year and this year it is back in Brienne-le-Chateau where it was held twenty years ago. Everyone is welcome ! German, Luxembourg and Belgian borders are not far so all our Europeans friends are invited...
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    6061-T6 tubing needed in the UK, ( HELP )

    I think in the UK, 6061 is quite rare but you can find more easily the British equivalent which is 6082 if I'm not mistaken.
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    The K8J project

    Make sure first with DGAC that you wouldn't have the same problem with the turboprop. As far as I know they only consider piston engines and turbine engines, so turboprops and jets fall in the same (latter) category.
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    Early 2019 Christmas Wish - RV-7HW...Are you listening, Richard?

    The Murphy Rebel would fit the lower end of the performance range, but with better STOL perf. What do you think ?
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    Filing weld joints

    I had read in a lot of places that one should'nt grind the welds to keep the material for structural strength, but in the industry (aero), almost all welds are grinded smooth, because the gain in fatigue strength from a smooth surface is much greater than the loss in static strength.
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    Homebuilt aircraft in Spain?

    Hi, I have no experience building an airplane in Spain, but flying a homebuilt from France only required an authorisation letter, to be asked long enough in advance because the administration is not very reactive, but that was obtained without any trouble, so I guess they are not too nervous...
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    Spar caps: Pultruded carbon profiles against wet roving layup

    Thanks for the information. I will try to discuss this with the authorities, especially the higher temperature would be interesting for airplanes that are not painted white. I know the laminated carbon spar sold in the CR100 kit is glued using Adekit 175, which also seems to have 130°C...
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