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Pages: 1 ... 9 [10]
 91 
 on: January 01, 2019, 06:36 PM 
Started by OZKITE_PILOT - Last post by Allen Carter
Trick kites are so inefficient, drag-wise, that this is a pretty silly conversation...  Smiley
So says the original owner of my DUSL Smiley


I think that particular DSUL is a bit magical...

 92 
 on: January 01, 2019, 06:31 PM 
Started by PaoloM - Last post by PaoloM
Quote
My go to kites are Exiles, solus and eclipse with an array of others depending on mood.

This Exile?
https://youtu.be/4o5syDoyh64

Man so many beautiful kites I donít know of. Like to Solus too,
Iím enjoying the SN and SF UL the most, now the WW, love the SF STD too, while the SN std pulls quite a bit, if you let the leech loose roars like an Harley :-) and slows down a bit.
Love also the Fulcrum. Are you flying those Rev 1.5 ?  Tongue

 93 
 on: January 01, 2019, 06:19 PM 
Started by OZKITE_PILOT - Last post by Frazer
Trick kites are so inefficient, drag-wise, that this is a pretty silly conversation...  Smiley
So says the original owner of my DUSL Smiley

-Frazer

 94 
 on: January 01, 2019, 05:58 PM 
Started by OZKITE_PILOT - Last post by Allen Carter
Trick kites are so inefficient, drag-wise, that this is a pretty silly conversation...  Smiley


 95 
 on: January 01, 2019, 05:52 PM 
Started by OZKITE_PILOT - Last post by Frazer
If Bingo's going all Pythagorean on us I'll go empirical.

I have a DSUL which remains efficient enough to be flown (on short lines) in SUL winds - with the rollbars intact.

Ergo, any associated drag is insignificant.

Q.E.D

-Frazer


 96 
 on: January 01, 2019, 05:14 PM 
Started by OZKITE_PILOT - Last post by chilese
Mathematically...

Assume: 15 psi ambient (really about 14.7 psi) Immaterial as we are using a differential pressure
Assume: Kite surface area of 1600 sq inches (approximately 1 sq meter)
Differential pressure front to rear surface: 0.1 psi
Pull on lines: 160 pounds force, 80 lbs per line

I would be surprised if the pressure differential on a sport kite skin ever got past this.

Flow across any part of a kite skin will always be non-laminar, but
it can still appear smooth to our eyes.

KaoS: A pleasure to read your inputs sir.


 97 
 on: January 01, 2019, 04:30 PM 
Started by sugarbaker - Last post by sugarbaker
So for those of you wondering what happened... I had a computer catastrophe about a day after the last post. Unfortunately, I lost about 12 hours of unedited video for this build.  That being said, I now have a new computer and have started back to the tutorials.  I will be able to voice over the original clips of me building the templates (which I have sped up so as not to bore you to tears), and should have a short video on template labeling the same (or next) day.  Hopefully some of you are still keen on watching!

 98 
 on: January 01, 2019, 03:40 PM 
Started by OZKITE_PILOT - Last post by KaoS
 The area behind the sail on a kite has almost no pressure due to the fact that the wind is redirected along the face of a kite.  


You are confusing pressure and wind speed.  A sport kite pulls away from the flyer because of it's airfoil properties, not because of Newtonian force against the "front" of the sail.
Yes, there is lower pressure at the rear of the kite, just as there is lower pressure above the top surface of an aircraft wing when compared to pressure below the wing.  But to claim there is "almost no pressure" is wrong.

If you have ever flown a stack with the link lines too short or through the wake of another kite at close range you would understand what void I'm talking about.



No, that's because of turbulence, not a "wind void".  Watch any of the many videos that explain how wings really work e.g. http://youtu.be/UqBmdZ-BNig and you might understand what I'm talking about.

There was a video of Mark Reed doing a wind tunnel test years ago where he had short ribbons attached to the back of the sail and you could see some of the ribbons laying flat with little to no movement.


Little to no movement of the ribbons merely indicates smooth airflow in that region.

 99 
 on: January 01, 2019, 04:55 AM 
Started by PaoloM - Last post by Kareloh
There isn't really too much difference in the nirvana versions.  Some bridle changes and I think some frame spec changes but no real major changes other than panel layout IIRC. 

One of the changes is the position of the lower spreader. The N3E has the LS higher in the kite which makes the backflip deeper and tricks like lifters, multilazies and cyniques more accessible compared to the earlier version. Also taz's are easier on the N3E. Quite a major change IMHO.

But i prefer the balance/feel/style of the 1st edition Nirvana (and the layout too).


 100 
 on: January 01, 2019, 01:24 AM 
Started by OZKITE_PILOT - Last post by Ca Ike
Theoretically they should create no drag at all.  They sit in a wind void created by the sail so any drag would be based on the weight which is negligible.

Huh?  Huh   In nearly all cases roll bars sit on rear of the kite, which is the upper surface of the airfoil.  This isn't a wind void at all!


Having said that, they produce very little drag - certainly not enough to outweigh their benefit on kites where they work well.

They can adversely affect kites that were not designed with them in mind, but that have them retro-fitted.  They retro-fit well on the early model Benson Gemini, but the weight of them alter the balance of a Minigem quite badly.


 The area behind the sail on a kite has almost no pressure due to the fact that the wind is redirected along the face of a kite.  If you have ever flown a stack with the link lines too short or through the wake of another kite at close range you would understand what void I'm talking about.  Easiest demonstration I can think of is to put a wind meter behind a kite and move it back until you get a wind measurement.  That distance gets shorter with forward movement but elongates off the tail end similar to the wake of a boat.  The low pressure area should theoretically mitigate any drag roll bars create.  There was a video of Mark Reed doing a wind tunnel test years ago where he had short ribbons attached to the back of the sail and you could see some of the ribbons laying flat with little to no movement.

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