  |
| View previous topic :: View next topic
:: View posts since last visit |
| How would you rate this plan? |
| Excellent! |
|
68% |
[ 11 ] |
| Very Good |
|
25% |
[ 4 ] |
| Good |
|
0% |
[ 0 ] |
| Fair |
|
6% |
[ 1 ] |
| Poor |
|
0% |
[ 0 ] |
|
| Total Votes : 16 |
|
| Author |
Message |
R Moore
Master Kite Builder
Joined: 16 Sep 2005
Posts: 363
Location: Sydney Australia
|
 Posted: Wed Sep 23, 2009 4:55 am Post subject: |
 |
|
GPS Telemetry, theodolites, telescope and binoculars.
Bob
_________________
BOB MOORE |
|
| Back to top |
|
planish
Joined: 19 Aug 2008
Posts: 1653
Location: Sackville, New Brunswick, Canada
|
| Posted: Thu Dec 03, 2009 3:35 am Post subject: |
|
|
| Quisp wrote: | Quick design question...
What is the main reason/advantage of having the trailing edge of the wings curved and the outer wing tips angled or "cut" short of coming to a point? |
I think I found a possible answer to the business of the squared-off wingtips and the extra fabric aft of the LE spar tips.
It's from Dan Leigh's Basic Delta Types, about 2/3 down the page.
| Quote: | | The "working" part of delta wings can be considered to be the area within the relatively flat central diamond visible in many of the photos. Outboard of this fairly rigid area where the fabric is suspended by the freely flexing spars, the panels take a conical shape. This is where any fluttering is concentrated. The fluttering gives stability. Many commercial deltas rely on excessive fluttering to mask construction faults, but a controlled amount is advantageous. Even scalloped deltas' outer wing panels flutter when the wings flex; the more they flex, the more the wings flutter; the more wind there is, the more stabilizing drag is automatically laid on. This may be a key factor for all deltas. Problems occur if, for instance, one wing tip begins to flutter before the other, which can drag a delta into a dive to one side. And beyond a certain amount, excessive flexing leads to excessive drag. The kite's inherently stable shape is lost, too much lift is lost, and the kite gets dragged down, possibly sustaining permanent damage as a result. |
Granted, he's talking about flutter as a result of spar flex and not specifically about extra unsupported fabric on the TE, but perhaps the principal still applies.
_________________
John Rose
"I am a leaf on the wind. Watch how I soar." (Wash, in Serenity)
ToDo list: hand shadow bird graphic on a Dopero; Urban Ninja; Marilyn Monroe portrait kite; another One-Piece Cody; Cody Box; Catherine's Wheel; Dave Wadeson's "Mouse", Manga Multiconos. |
|
| Back to top |
|
Quisp
Joined: 10 Aug 2006
Posts: 97
Location: Rancho Cordova, California
|
| Posted: Thu Dec 03, 2009 6:43 pm Post subject: |
|
|
| Quote: | | The "working" part of delta wings can be considered to be the area within the relatively flat central diamond visible in many of the photos. Outboard of this fairly rigid area where the fabric is suspended by the freely flexing spars, the panels take a conical shape. This is where any fluttering is concentrated. The fluttering gives stability. Many commercial deltas rely on excessive fluttering to mask construction faults, but a controlled amount is advantageous. Even scalloped deltas' outer wing panels flutter when the wings flex; the more they flex, the more the wings flutter; the more wind there is, the more stabilizing drag is automatically laid on. This may be a key factor for all deltas. Problems occur if, for instance, one wing tip begins to flutter before the other, which can drag a delta into a dive to one side. And beyond a certain amount, excessive flexing leads to excessive drag. The kite's inherently stable shape is lost, too much lift is lost, and the kite gets dragged down, possibly sustaining permanent damage as a result. |
| Quote: | | Granted, he's talking about flutter as a result of spar flex and not specifically about extra unsupported fabric on the TE, but perhaps the principal still applies. |
Good find there...  ....And it makes sense.
I'd imagine the ideal design of the trailing edge curvature and squared-off wingtips would vary from kite to kite...."That looks about right."
No one answer would work for all... |
|
| Back to top |
|
Pumpkin
Joined: 30 Oct 2006
Posts: 6824
Location: Birmingham UK
|
| Posted: Thu Dec 03, 2009 11:23 pm Post subject: |
|
|
IIRC Originally the trimming of the TE was also to correct any leaning in flight....with the curve slight deliberate differences aren't as noticable
_________________
Pete
Where did you say the string goes? |
|
| Back to top |
|
Fore Check
Kite and Kitebuilder of the Year 2009
Joined: 15 Jun 2008
Posts: 2649
Location: The Montessori School of Kites (near Findlay, OH)
|
| Posted: Fri Mar 26, 2010 10:26 am Post subject: |
|
|
What scale factor would you use to scale this plan up from a 0.125 micro Carbon spreader to, say, a SkyShark P400?
And then what would you scale the 0.098 microcarbon wing spars to at the same scale factor?
_________________
Simon
Discovering Something that Doesn't Exist...
Radix Lecti Rex |
|
| Back to top |
|
|
View posts since last visit
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
|
