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#1
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Forward Swept Wings
I am working slowly on an evolving Fly5k design and considering a
swept forwrd wing. Does anyone know anything about thier design? Also would anyone have experience with the Sisler Cygnet, Andreasson BA-7, or Pottier's Bleu Citron designs. The Cygnet seems to be well thought of but I don't know any owners or pilots that actually flew one. I've learned that mild forward sweep (less than 5 degrees)is not much different than a standard wing. A tapered wing with lots of forward sweep is prone to twist its tips upward under load so must be torsionally rigid. I am sticking with the simple rectangular wing planform and sweep of 3-4 degrees max. This allows a compact mid wing and with a 30% C spar location the pilot sits on the c of g with the mac moved forward slightly (app. 1/2 the amount of forward sweep). |
#2
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This summer their was a large ad in Trade-A-Plane about the production equipment auction on the ARV1 Super 2 certified airplane. I always liked this plane because of its forward sweep mid-wing. It had excellent visibility up and down. They had it at Oshkosh for many years. Anyone know why this plane was never successful in sales? It was built out of all Aluminum. It was designed in Europe and certified. Then a company in Canada had it. Then the rights to Minnesota, then to some where in Ohio. I don't know if any one bought it at the auction. A picture of a ARV1 http://www.planecheck.com/images/2480/ARV.jpg I have gotten a letter this summer from a person in England that had one for a couple year and never had any complaint about it. He sold it, because he has many planes and a Helicopter to play with. Has any one in this group flown a ARV1, that can give some good advice of this plane flight performance qualities. Larry Fitzgerald |
#4
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What is it that you're hoping the forward sweep is going to give you?
Also, under load, the forward swept wing will bend in a direction that further increases its load("twist its tips upward"), and so on... positive feedback... which could cause failure of the structure ("departure" of the wings from the rest of the plane). (Canuck Bob) wrote in message . com... I am working slowly on an evolving Fly5k design and considering a swept forwrd wing. Does anyone know anything about thier design? Also would anyone have experience with the Sisler Cygnet, Andreasson BA-7, or Pottier's Bleu Citron designs. The Cygnet seems to be well thought of but I don't know any owners or pilots that actually flew one. I've learned that mild forward sweep (less than 5 degrees)is not much different than a standard wing. A tapered wing with lots of forward sweep is prone to twist its tips upward under load so must be torsionally rigid. I am sticking with the simple rectangular wing planform and sweep of 3-4 degrees max. This allows a compact mid wing and with a 30% C spar location the pilot sits on the c of g with the mac moved forward slightly (app. 1/2 the amount of forward sweep). |
#5
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In article ,
(Canuck Bob) wrote: I am working slowly on an evolving Fly5k design and considering a swept forwrd wing. Does anyone know anything about thier design? Also would anyone have experience with the Sisler Cygnet, Andreasson BA-7, or Pottier's Bleu Citron designs. The Cygnet seems to be well thought of but I don't know any owners or pilots that actually flew one. I've learned that mild forward sweep (less than 5 degrees)is not much different than a standard wing. A tapered wing with lots of forward sweep is prone to twist its tips upward under load so must be torsionally rigid. I am sticking with the simple rectangular wing planform and sweep of 3-4 degrees max. This allows a compact mid wing and with a 30% C spar location the pilot sits on the c of g with the mac moved forward slightly (app. 1/2 the amount of forward sweep). A number of two place gliders use forward sweep for exactly the reason you are citing. A common forward sweep wing glider is the Blanik L-13, L-23 series (as used by the USAF Academy, the Civil Air Patrol, and about a zillion glider operations all over the world) See http://www.nwinternet.com/~blanikam/ba/prod01.htm. The Alexander Schleicher Ka-7 and Ka-13 gliders are also very common forward swept wing gliders. http://www.gliding-in-melbourne.org/ka7.htm has a good three view. Good luck with the design. Wallace |
#6
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A friend of mine has a Cygnet. Nice plane to fly w/excellent viz. Very
stiff wing on this plane, due to geodesic construction. Also the reason it gets away with a single lift strut. -- Kevin McCue KRYN '47 Luscombe 8E Rans S-17 (for sale) -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#7
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If you change a design to different wing sweep, don't forget
that it will move the center of lift in the direction of sweep and it may significantly alter W & B and permissible CG range position. ------------------------------------------- Paul Lee, SQ2000 canard project: www.abri.com/sq2000 (Canuck Bob) wrote in message . com... I am working slowly on an evolving Fly5k design and considering a swept forwrd wing. Does anyone know anything about thier design? Also would anyone have experience with the Sisler Cygnet, Andreasson BA-7, or Pottier's Bleu Citron designs. The Cygnet seems to be well thought of but I don't know any owners or pilots that actually flew one. I've learned that mild forward sweep (less than 5 degrees)is not much different than a standard wing. A tapered wing with lots of forward sweep is prone to twist its tips upward under load so must be torsionally rigid. I am sticking with the simple rectangular wing planform and sweep of 3-4 degrees max. This allows a compact mid wing and with a 30% C spar location the pilot sits on the c of g with the mac moved forward slightly (app. 1/2 the amount of forward sweep). |
#8
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Canuck Bob wrote:
I am working slowly on an evolving Fly5k design and considering a swept forwrd wing. Does anyone know anything about thier design? A little bit g Like you say, a little forward sweep can get the spar out of the way in the cabin. The big thing you have to work out is the potential for structural divergence - the natural twist of the wing tends to increase AOA, making the twist increase, etc...so you'll have to make it stiffer than a straight or aft-swept wing. Dave 'aeroelastica' Hyde |
#9
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"Paul Lee" wrote in message om... If you change a design to different wing sweep, don't forget that it will move the center of lift in the direction of sweep and it may significantly alter W & B and permissible CG range position. That depends on whether you sweep the tips forward or the roots backwards.(Grin) If the purpose is to move the wing spar carry-through structure aft of the cockpit, the forward sweep is likely to leave the center of lift right where it would be with the spar going through the cockpit with a straight wing. Bill Daniels |
#10
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the natural twist of the wing tends to
increase AOA, making the twist increase, etc...so you'll have to make it stiffer than a straight or aft-swept wing. And you might need a bit more than normal dihedral.............. IMHO the added weight needed for the stiff wing would be worth it for the added visibility and cockpit room on a recreational aircraft. Take a look at the Marske site for some ideas on forward swept wing design. http://www.continuo.com/marske/ Graphlite rod is actually quite cost effective. |
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