Joined wing explorations and confirmations ...
flying, testing, building, dreaming, studying by Alex Morillo and others:
http://www.instructables.com/id/Very-Simple-Kite/#step1 Joined-wing kite
SpiralAirfoil Dan Parker gave lead link for Synergy Aircraft:
[ ] Brian Porter ... all his wings
Alberto Santos-Dumont and his 14-Bis http://en.wikipedia.org/wiki/Santos-Dumont_14-bis
Explore the Hargrave box kite as a joined wing system
Harry, Consider- The modern airliner has a
complex wing that opens into a true multi-wing for take-off and landing.
The slats and multi flaps are clearly seen for the true wings they are
when separated out in use. Therefore Boeing and Airbus ONLY make
multi-wing aircraft, rather than "nobody makes them". Such multi-wings
are an essential engineering feature, not a frill. The true wing
count has actually increased over time.|
Also, there are popular sport planes made today with multiwings in a traditional sense, especially for combined extra strength and snappy aerobatic performance. Some SSTs had fore wings. Airplane stabilizers should also count as true wings, if of a special function, and they often add lift, so almost every plane is multiwing in a strict fundamental sense. Large helicopters have high blade counts from necessity. One could go on with such examples.
Therefore, lets not be blindsided if higher wing counts somehow emerge in new wind turbines, especially in AWE, but keep an open mind, daveS Dave Santos, May 16. 2012
 What is going on: ISAT REVCON "Joined-Wing Technology Evaluation" Systems Study"
Dr. Julian Wolkovitch was in early Low & Slow office with models and images. We talked at length. He thin lived in my home town of Culver City. RIP. He was a subscriber to Low & Slow.
Brian Porter Folder of files are being made. May 17, 2012.
John MacDonald Folder of files are being made. May 18, 2012.
[[ [ ] Note added on May 13, 2012: Consider claims by John MacDonald. TonyP is researching. [ ] Platz sailwing very much cores on precedence on some of the works. Independent split sailwing HG by Prentice is documented in LIFT, which see. Some email discussion is still ongoing on these matters. Related: Eric B. Hall, Julian Wolkovitch, Tony Prentice, John MacDonald, and some kite patents. TW hang glider
Text at group: "This is called faith in my design and construction! Designed built flown early 70s.
TW hang glider.jpg - 49.2 KB - Views: 167
Posted by: macboffin on May 13, 2011 12:41 PM " ]
Is this the compound wing aircraft patented by Eric B. Hall that was filed Oct. 2, 1979. It follows the lines of one of the several embodiments drawn in the patent; see below on this LIFT page. Notice the cited 1916 filing of Emmons where Emmons had the strong triangle frame part as undercarriage (in 1908 in Breslau, the cable-stayed triangle control frame with pilot hung behind it may be part of the robust story Rupert A. Emmons clip of 1916 filing for his patent).
Recall that Julian Wolkovitch was in 1972 or 3 in the Self-Soar Assn. and Low & Slow office with info, etc.?
Joined wing aircraft G: "Wolkovitch wing"
US Pat. 3942747 - Filed Jun 24, 1974
9,  JOINED WING AIRCRAFT  Inventor: Julian Wolkovitch, 28603 Trailriders
Drive, Rancho Palos Verdes, Calif. 90274  Filed: June 24,  Appl. No ...
Faust-Snout Joined-wing hang glider
Patent number: 3995799
Filing date: May 23, 1975
Issue date: Dec 7, 1976
- http://www.youtube.com/watch?v=NtMkbi_D2TU Diamond wing
- [ ] Boxwing search videos
[ ] See November 2010. e-mails with AM. See the art and follow his claims.
(See e-mail of November 17, 2010) Note: This confirms that similar joined wings, with ¨wing - struts¨ are truly airworthy ...yeah ! AM. (winging structs)
[ ] Yet to do: Reference for the morphology of joined wings
[ ] http://img.auctiva.com/imgdata/0/5/7/1/8/3/webimg/412409982_o.jpg Explore "Diamonds"
http://www.flightglobal.com/pdfarchive/view/1911/1911%20-%200212.html Incomplete join, but joining ...
http://www.flightglobal.com/pdfarchive/view/1910/1910%20-%200381.html?search=glider&tracked=1 ?canard in front of joined wing?
http://farm5.static.flickr.com/4146/4832896713_7606556160_b.jpg TCF, ski, wheels, joined wings, biplane joined wing
Explore all related patents for the story:
Former LIFT notes
OZ Report discussions:
Directional Stability without a Rudder(s) ? yes, I tried it and the gliders wooble around , the extra weight, drag, and assembly time is worth the effort, specially if I intend to fly at 100Kph !
Birds don't have rudders, yes that's true, but they have their built-in mechanisms to control their heading. I believe in biomimetics, but at high speed we want some vertical surface(s) to keep us on track. Some manta rays have a ¨rudder¨ ....must mean something !
Net dihedral effect on Joined Wings When banking (say left ) the lower front (left) wing is trying to go up to self-level, but the rear right upper wing is trying to pull UP , fighting the lift of the main wing, eventually the main wing (left side) wins and the glider self levels.
More Dihedral is better on JWs ...I have built a.6 deg , which is OK , 10 is better .
Another reason - the anhedral angle of the aft wings is important, it shouldn't be parallel with the main wing. I think you get the point, right ?
There is no better way to ¨see¨ all this flying dynamics, than to fly yourself, so, here are some ¨plans¨ if you wish to build a J-5 JW ; you are welcome to build a balsa HLG to test fly.
You can try any angle variation from the stock 140; they all fly. What I m trying to find is THE best configuration - geometry, perhaps you guys can help ! THANKS.
Ref ´ Aerodynamics of Joined Wing Configurations ¨ by LAURENT VIERIA de Mello
Cranfield University and ref 6 ( JW configuration drawing ) by Hashimoto
Fly gentlemen , Fly !
Brett to amorillo61, Tony, Joe
show details Jan 26, 2010
Some points to ponder.
Flying wings with around 20 degrees sweep have directional stability that derives from sweep alone and typically don't need additional vertical devices - see the Horten wings that flew well over 100 kph. If you used a Bell distribution you get additional stability from the tip washout - none of the Horten wings had directional stability issues and all had no verticals at all.
Some military aircraft that need high levels of sweep actually use anhedral to reduce the excessive directional stability that results from the sweep. Hang gliders need no verticals and actually use anhedral as well - not to reduce directional stability but to couple roll with adverse yaw that results from tight sails in high performance wings.
Tip rudders have been found to impart directional stability considerably better than central fins in flying wings - this works best if a degree of aerodynamic or geometric toe out is used. When the wing yaws one surface strikes the airflow at an increased AofA the other at less - the drag differential imparts yaw stability.
Birds do use an effective vertical surfaces: the tail can roll as well as deflect up and down.
See his further e-mail and image July 29 or July 30. Include it all.
Deal with split wing of Prentice
Frank J. Bartolini
Patent number: 3995799
Filing date: May 23, 1975