Joined wing explorations and confirmations ... 
flying, testing, building, dreaming, studying 
 by Alex Morillo and others:    Joined-wing kite  

[] What is going on: ISAT REVCON "Joined-Wing Technology Evaluation" Systems Study"

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[ ]  See November 2010.  e-mails with AM. See the art and follow his claims. 

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 Rogallo concentrating on boosters but realizing much more.


(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




[ ]   Explore "Diamonds"    Incomplete join, but joining ...   ?canard in front of joined wing?

[]   TCF, ski, wheels, joined wings, biplane joined wing

[ ]

Hang 3 pilot, Driver at Quest 04, 05, 06 Driver at Big Spring 07
Gypsy Project Designer
Driver - Guide in Ecuador
Street Luge nut , WW Fan
currently flying a Airwave K2
come FLY in CANOA !

New story:

Explore all related patents for the story:

30+posts in OZ Report

Preamble links:

Former LIFT notes

OZ Report discussions:



Hey Amigos

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

Deal with

Hang glider

Frank J. Bartolini

Patent number: 3995799
Filing date: May 23, 1975


      Study as a sub-topic of joined wings.