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All things hang gliding. This is the main forum. New users, introduce yourself.

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User avatar
By Lucky_Chevy
#379743
This is a double surface sail that could have some application to a quick setup and compact wing.

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By blindrodie
#379745


WOW that's the first time i have seen an idea that is possible TODAY for the design of a portable wing!

What am I missing?

8)
User avatar
By TjW
#379759
Not sure how that helps. It still seems to require a long rigid spar.
User avatar
By Lucky_Chevy
#379762
Consider the sail mated with a telescoping carbon fiber tube. Making the pole strong enough and with positive stops is an engineering challenge but not a difficult problem.

Making the entire assembly compact and light weight is a bigger challenge. In my opinion a 5' (1.5 m) pack length isn't valuable if the wing weigh over 100 lb (45 kg). My current 70 lb (32 kg) is barely manageable at times.

This is an interesting project. I hope some of the manufacturer's take note.



Dan
User avatar
By joefaust
#379796
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Lucky_Chevy,
Yes, the spar may get high focus: Examining comprehensively spar choices may be a key solution path. Low mass is to be kept in mind. Comparing spar options would be a keen preliminary adventure.
X-deploying
Encased bladder spars
Splinted encased bladdered spars (tensairity enhanced cased air bladders)
Telescoping spars
Tensairity spars
Tempered-shell-that-coil spars
Segmented shell spars
Truss spars
Telescoping trussed spars
Multiple thin-shell segments (telescoping)
Hybrid: central shell segment and then cased bladder air beam spars. Use central shell segment as the macro tote case for all gear.
... and more. It would be the fun thing to have a robust mastery over spars that may become compact in various ways
=================================================

==> Thinnest Plates That Can Also Flex and Be Picked Up by Hand May Create New Flight Materials

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==> Rigidized Inflatables

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Image

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==> Air Bridge

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Technical historic note: The basic technology of splinted air beams is ancient. That a company has pushed and registered a trade name "Tensairity" does not mean they own the fundamental method; they don't.
==================================================

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User avatar
By flyit
#379844
Im New to hang gliding and about to get my H2 rating. I will say to the idea of simplifying set up and break down, this is a worthy idea, but a bigger problem is directly related to very limited flying sites available. Making Flat land foot launch a regular part of this sport will change everything. It is a very very needed option to grow hang gliding in all areas of the world. see E help hang glider on youtube.
This is a very real opportunity. I know the sport is traditionally about soaring, but lets be honest, to far and few between mountain and pro aerotow launch sites will always be the limiting issue to growing the sport. One day soon I will launch out of a park in my home town with a power assist pod and people will come to see me and want to learn how they can get into the sport. Ill tell them go to hg school and then buy an e powered pod. My thoughts on growing the sport. Kindly Flyit..
User avatar
By raquo
#379851
Thanks for the SoftWing video, Lucky_Chevy!

Previous Sock glider designs that I've seen worked differently – you would take off the sail starting from the *root*, and you ended up with a bunch of sail in your hands by the time you got to the wingtip. Keeping the sail at the root on the other hand simplifies set up & breakdown a lot, and saves some weight since you don't need to connect the sails together at the root.

This technique is most impressive on a cantilever spar typical for rigids, but it could be used on flex wings too. Bowsprits most obviously, but maybe even on those with a crossbar. Non-cantilever rigids too.

---

Speaking of inflatables... I'm not sure I would trust a fully inflatable glider more than a modern PG. However, some components could still be inflatable, e.g. ribs. If those fail, they would probably fail independently of each other and a single failure would not cause an accident.

Or maybe some kind of rigid structure could be designed that holds up to +3G / -2G, and some inflatable component reinforces it to the common +6G / -4G. The point being, if the inflatable component fails, you still have a good chance of landing safely. I don't suppose putting an inflatable bladder inside a typical HG alum or carbon tube would reinforce it much? There could be other ways...
User avatar
By joefaust
#379899
flyit,
eHG is also my pet future-predict for HG. eHG will open millions of launch and landing opportunities. Small eHG will permit landing practice in calms.
Integrating e charge internally of the HG frame or/and harness will occur well.

eHG should have its own special forum topic thread.

The topic of the 5 ft-or-less project/movement is worthy of its own focus.
Such combined with eHG is one of my personal targets for busable trekking.

Best,
Joe

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MORE SoftWing
==> http://soft-wing.ch/en/category/softwing-project/
and:
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User avatar
By joefaust
#380054
Four items:

1. http://www.northropgrumman.com/Business ... X-Beam.pdf
PDF on X Beam deployable beam

2. Stellar site:
http://www.laboratoridenvol.com/pindex.en.html Pere Casellas

3. The "6-ft Falcon" is not yet in the "5-ft-or-less" space, but have a look-see:
http://www.hanggliding.org/viewtopic.php?t=31094 [And the "6 ft" might really be a point to have confirmed preceisely; how much more than "6 ft" is the bagged deal?]

4. ==> http://patentimages.storage.googleapis. ... D00000.png
Then: ==> Deployable truss with orthogonally-hinged primary chords
US 8813455 B2
User avatar
By Stallpolicer
#390620
Let's aim for slightly less than 9 feet. That size can fit on a standard long-pallet and be shipped anywhere.
User avatar
By Johannez
#402649
Hi everyone,

I just stumbled upon this old sketch, and decided to see if anyone is looking into the same thing; a collapsable back-pack hang glider. So i ended up here :)

The ultimate idea is to make it collapsable with limited amount of (de-)construction time. a single inner spring could provide the tension, to unfold and fold it would only need to be applied or released.

I'm sure it would require some very expensive composite materials to make it sturdy and light enough, but i figured using big O-rings could relieve the joints of a lot of the major stress-loads. re-enforcing all the spars with a curved carbon structure could do the trick.

i think it should be possible..right? and it would look great too ;)
Attachments
backpack hangglider concept.jpg
sketch of a collapsable backpack hang glider
backpack hangglider concept.jpg (584.01 KiB) Viewed 466 times

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