AV 6 (oz13203)
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AV 6. Free flight glider model. Wingspan 900 mm.
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User commentsSee https://fr.wikipedia.org/wiki/Guy_Borg%C3%A9
Very interesting person. Probably A.V. stand for Aile Volante.
Pit - 30/07/2021
Interesting indeed. I'm puzzled about those "volets de réglage" (trimming spoilers, it seems) on the wingtips. By the way, 10/10 are tenths of 1mm, so 10/10 means 1mm, 20/10 is 2mm, etc. I loved the "Borgé 3" wing section, this must have been plotted following the classic boot outline method - you step on your plywood sheet and follow your boot contour with a pencil, I read this long ago in EAA magazine and it appeared to work!
Miguel - 30/07/2021
What a find! Thank you Outerzone for all these classic old-timers the ooze character.
John Green - 30/07/2021
Hello, the "boot profile" seems to be actually a studied freestanding profile, with double concavity of the midline and constant pitch moment coefficient, widely used in some old flying wings, I think it is worth trying those spoilers !!!
Claudio Acosta - 30/07/2021
Seems to be the same airfoil he later used in the AV-10 (oz 4423). Looks neat, with a very smooth reflex incorporated into it. I wonder if AV's 1 thru 5 and 7 to 9 were ever finalized and published.
RC Yeager - 30/07/2021
I'm not belittling the designer's abilities, the Boot Airfoil Design Method was and is well recognised, think Roncz or Wortmann! The following is Martin Heppele's take on 'flying wings' even if coming much later than this AV 6 plan: http://www.mh-aerotools.de/airfoils/nf_1.htm
Considering all this, looking at the flat extent on the lower surface of his rib shape makes me believe that:
- either M. Borgé´s shoe had a flat side,
- or he made a concession to ease of building,
- or both,
- or none of above :-)
Miguel - 01/08/2021
You can actually find coordinates for the Borge 3 on-line. Furthermore, either they come with Profili or I put them in at some point. I tried a type 2 polar, with a turbulator at 30 percent. Profili uses Xfoil for this, so the results should be reasonable. The type 2 polar just means that the Reynolds number is adjusted to match that of a model in stable flight. I picked 75k for a Cl of 1, which ought to match the model pretty well, though you probably wouldn't see a Cl that high. At an angle of attack of 7 degrees, I got an L/D of about 39, and a pitching moment of around +.005, which probably isn't quite enough. At lower Cl's, the moment can get as low as -0.01, so there will probably need to be trim tabs or something. Maybe that's what those spoiler things do? In any case, this should all be taken with a grain of salt, because the model isn't sheeted and has covering sag. Still, it seems to me the design is probably in the ballpark.
It seems to me that the airfoil on the AV-10 has a bit more reflex, even though that model, having a tapered wing, might be helped with a bit of washout. The AV-10 has sheeting on the forward part, too. If I read the drawing right, the sheeting is NOT flush with the ribs, so there's a 1/64" drop at the end, perhaps acting as a turbulator.
Lincoln - 29/12/2021
Hi, I got my hands on the plan for the av 6. Before starting to build it; I have a few questions after carefully studying the plan. The construction is supposed to be of hardwood. Period of the 40s obliges... So I have several questions. can we build it in balsa...in,samba...in samba and balsa. Which pieces should or can use each of the woods?
If all balsa, double the thickness? Keep the same thicknesses? For samba? The mixing of the two woods? Knowing that the wings have a large width, flying wing obliges ;-)
Olivier - 16/05/2022
Cher Olivier, forget the hardwoods, do it all in balsa using the same thicknesses or less. This is a small glider so you need weight as much as a toothache. You can build the boxes in for those spoilers if you see any use for them. Never mind about samba unless you have swift feet and a partner even better than you!
Miguel - 17/05/2022
Balsa is a hardwood.
D A - 17/05/2022
Thank you Miguel, I see... and for interlining... What advice do you give me?
Olivier - 17/05/2022
DA....It all depends on the quality of the balsa... some are very fragile;)
Olivier - 17/05/2022
Whether a wood is classified as a "hardwood" or "softwood" depends on the type of seed. It has nothing to do with density or strength.
D A - 17/05/2022
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