GWTW Forum
November 22, 2014, 11:50 PM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with username, password and session length
News:
 
   Home   Help Forum Info Login Register Chat  
Welcome to the GWTW Forum.
Guests (non-registered users) can view the forum but are unable to post.  If you don't have anything to say then why would you bother to register?
One of the most popular sections of the GWTW Forum has long been the Swap Meet.  A great place to sell old, seldom flown kites or to get great deals on used (gently flown) kites.  Only registered users can see the Swap Meet section, let alone wheel and deal.  1000's (literally) of kites have changed hands thanks to the Swap Meet.
There are several more benefits to being a registered user, but you'll have to join our little community to find out all the "secrets".
Questions or concerns? Contact Steve ... just drop an email to: forum.gwtwkites@gmail.com

Pages: 1 ... 8 [9] 10
 81 
 on: November 19, 2014, 09:57 AM 
Started by jlmcevoy - Last post by Allen Carter
I love the sound of crisp new ripstop in the morning!

 82 
 on: November 19, 2014, 08:37 AM 
Started by stapp59 - Last post by Ara Ararauna
That one destined for the Carolinas is stunning!

BTW, here is a link to a recent outing of mine with the Enigma giving me a work out.

http://youtu.be/-Zdu-Yu6quw

I am really enjoying the feel of this kite. Thanks Steve!!!

Jim


Jim nice flying.

And your layout also looks beautiful in the air!   Huh Smiley

Cheers!

 83 
 on: November 19, 2014, 08:18 AM 
Started by jlmcevoy - Last post by jlmcevoy
Yes, the sound of flying can be informative. I was debating about a little music to overlay on the video but decided to go natural.

The standard Enigma just handles great in 10 mph winds with the full set of weights. It is moderate to fast and snap stalls in the power zone easily. Slides, rollups, cometes, rolling susans, etc. are all there.

Good job with the mods Steve.

Jim

 84 
 on: November 19, 2014, 07:08 AM 
Started by jlmcevoy - Last post by stapp59
Another nice video! Thanks Jim  Smiley

Boy do I recognize that sky, snow, wind sound.  Brrr.  Only 18 here yesterday.  30 today - maybe.

Looks like it rolls up ok  Cheesy  The red nose and tips are really helpful to follow the kite through the tricks.

10mph seems a nice wind speed for the kite and tricks.  I could hear the sail when you snapped corners or pulled back sharply.

Talk soon and thanks again.

Steve


 85 
 on: November 19, 2014, 06:36 AM 
Started by stapp59 - Last post by jlmcevoy
That one destined for the Carolinas is stunning!

BTW, here is a link to a recent outing of mine with the Enigma giving me a work out.

http://youtu.be/-Zdu-Yu6quw

I am really enjoying the feel of this kite. Thanks Steve!!!

Jim

 86 
 on: November 19, 2014, 06:30 AM 
Started by jlmcevoy - Last post by jlmcevoy
Just a few clips of a recent bit of exercise for me. Enjoy!

http://youtu.be/-Zdu-Yu6quw

Jim





 87 
 on: November 19, 2014, 02:34 AM 
Started by Jorge Gouverneur - Last post by KaoS
I assume the longer the V part of the Y, the more the tail will be able to transfer corrective effect to the kite?


Interesting question.  My first thought is no... in fact probably the opposite. Although it might have that effect if the Y-line were actually a tail rather than a line.

The reason the Y-line is so effective is that it acts from a point central to the trailing edge and not very far from the trailing edge.  So a pull on one side of the line doesn't just pull that side of the kite rearwards, it pulls it around towards the centre.  The kite rotates around a point close to the centre of the trailing edge.

If each side of the V were long, the rotation point would be quite some distance behind the kite.  Instead of the kite being quickly rotated back towards the centre, it would more likely be dragged sideways with a much smaller amount of rotation.  This would lead to a kite which doesn't rotate so much from straight into the wind, but sweeps in a wider arc slowly back and forth across the sky

While I'm at it, your thoughts on U tails?


U tails have a very similar effect to single tails on a Y-line.  As a kite rotates away from straight into the wind, the side of the tail which has been pulled forward becomes longer than the side that has fallen backwards.  Because it is longer, it creates more drag than the section of tail attached the other side of the kite.  This drag pulls that side of the kite backwards until the kite points straight into the wind and the two sides of the tail are equal in length again.

Talking about U tails, this got me thinking about the arrangement where you have a U tail with a single additional piece coming off the middle - effectively creating a Y tail, but with the whole Y adding drag instead of just the central leg. How do you think that would compare to the Y arrangement where just the middle leg is adding drag?


I've seen this used very effectively on some German rectangular soft kites that have no keels.  For want of a better description, the kites are effectively inflatable Della Portas.  DPs traditionally have (and need!) a loop or U tail



Will any of this logic change if you go from a flowform, pilot, etc to a delta, rokkaku, conynne, etc?


No, the logic doesn't change.  But it gets affected by how far apart the mounting points are for the tail/loop, and whether the kite can have the mounting points at the very rear of the kite.  So, not particularly useful on a diamond


 88 
 on: November 18, 2014, 10:01 PM 
Started by Jorge Gouverneur - Last post by kwmf
I assume the longer the V part of the Y, the more the tail will be able to transfer corrective effect to the kite?

While I'm at it, your thoughts on U tails?

Talking about U tails, this got me thinking about the arrangement where you have a U tail with a single additional piece coming off the middle - effectively creating a Y tail, but with the whole Y adding drag instead of just the central leg. How do you think that would compare to the Y arrangement where just the middle leg is adding drag?

Will any of this logic change if you go from a flowform, pilot, etc to a delta, rokkaku, conynne, etc?

 89 
 on: November 18, 2014, 03:43 PM 
Started by JimC - Last post by JimC
There aren't any.
For one thing, an individual can burn off up to 50% of his weight during a single flight, and his cg changes as he does so.  So flight configuration changes throughout the course of the flight.  For a kite, you'd just have to pick a specific condition and design for that.  Also, the hindlimbs/uropatagium are usually flown in upload configuration with the upload being slightly less than the weight of the hindlimbs.  This is done to unload the pelvic muscles.  It is aerodynamically quite unstable though.

John's quetz drawing would be close if you configured the long neck like geese or swans carry them in flight -- to spin off parallel, counter rotating vortices over the top of the neck and back.  Also, fly the torso at a slightly positive aoa (not as much as the swan in the photo below).

And the base of a pterosaur's neck exits the torso higher than it does on a bird (due to the way they align the two short vertebrae at the base of the neck)

 90 
 on: November 18, 2014, 01:39 PM 
Started by sadsack - Last post by Boats13
I registered, because it would not let me view the pics. No response from the board moderators, yet.

CT
Boats

Pages: 1 ... 8 [9] 10

kmacFab
kmacFab

Kite Classifieds Ad
Kite Classifieds

A Wind Of Change
A Wind Of Change

Untitled Document
Untitled Document

A Wind Of Change
skyshark

Kitebookie
Kitebookie.com

Untitled Document

Untitled Document
Untitled Document

Our forum is made possible by the good folks whose ads appear above and by the members of our community (PayPal donation button at bottom)
In case you missed it each ad is linked to the sponsors web site.  So please, take a moment and visit our sponsors sites as this forum wouldn't be possible with out them.
Interested in running an ad for your business or kiting event?  Contact Steve at advertise.gwtwkites@gmail.com for a quote.

Cal Custom

Support the GWTW Forum

Powered by MySQL Powered by PHP Powered by SMF 1.1.8 | SMF © 2006-2008, Simple Machines LLC
SimplePortal 2.2.1 © 2008-2009
Valid XHTML 1.0! Valid CSS!