Jump to content
KiteLife Forum
photomom

First Quadline Kite

Recommended Posts

On 9/19/2016 at 9:01 AM, makatakam said:

You may find that the leading edge of the sail flutters at higher speeds. If so, you can slip a very small diameter carbon rod into the seam to eliminate the flutter, or sew a stiffer material strip along it. See the photo I posted, the LE is attached to the front and back on this design for that purpose. I am also making a second kite where it only attaches to the front.

Can you elaborate a little on this?  Is it because there is no mesh in the "vents"?

Share this post


Link to post
Share on other sites

Got a feeling it would work similar to the leech line on a dualie. Loose and the edge vibrates, tight and the sail gets quiet. Mesh to some degree "regulates" how much air escapes, no mesh means it spills faster - no resistance.

IMO

Share this post


Link to post
Share on other sites
2 hours ago, Zuul said:

Can you elaborate a little on this?  Is it because there is no mesh in the "vents"?

Yes. A loose edge will flutter, whether it's the leading or trailing edge. The leading edge must be either tautly stretched or otherwise stiffened to avoid this. The span of cloth between the tabs also affects how easily it will flutter. The shorter the distance between them the less chance of flutter. Sail harmonics will also come into play at some speed, but that's a different subject. Search New York Minute flutter or NYM flutter on this forum if you want to know more.

Share this post


Link to post
Share on other sites
56 minutes ago, makatakam said:

Yes. A loose edge will flutter, whether it's the leading or trailing edge. The leading edge must be either tautly stretched or otherwise stiffened to avoid this. The span of cloth between the tabs also affects how easily it will flutter. The shorter the distance between them the less chance of flutter. Sail harmonics will also come into play at some speed, but that's a different subject. Search New York Minute flutter or NYM flutter on this forum if you want to know more.

OK.  I went back, looked at your design, and understand what you mean now.  Makes complete sense when you think about it.  I just didn't think about it until you pointed it out!  :)

Is the leading edge on yours dead-straight like it's shown in the illustration?  Or is the picture "not to scale" for simplicity?

Share this post


Link to post
Share on other sites

Looks to be a flat pattern, not a "flying" setup. Notice the dotted lines showing a regular 1.5, very much smaller. 

I would guess putting caps on would introduce some flex in the LE.

Share this post


Link to post
Share on other sites
11 minutes ago, Wayne Dowler said:

Looks to be a flat pattern, not a "flying" setup. Notice the dotted lines showing a regular 1.5, very much smaller. 

I would guess putting caps on would introduce some flex in the LE.

The typical rev-style sail has a curved LE pocket as sown (i.e. flat pattern).  That's not to say a straight LE won't work, it's just not how most are designed. 

  • Like 1

Share this post


Link to post
Share on other sites
1 hour ago, Zuul said:

The typical rev-style sail has a curved LE pocket as sown (i.e. flat pattern).  That's not to say a straight LE won't work, it's just not how most are designed. 

The pattern shown is straight, but it is a computer-generated illustration. It is a flat drawing as opposed to a cutting pattern. The pattern for the build does have a curved leading edge. 

P.S. -- I'm not sure if you guys are talking about the banana kite or the drawing I posted. I'm talking about my drawing, but it looks to me like Wayne is referring to the banana and Zuul is talking about my drawing. Hard to tell and confusing.

Share this post


Link to post
Share on other sites
1 hour ago, makatakam said:

The pattern shown is straight, but it is a computer-generated illustration. It is a flat drawing as opposed to a cutting pattern. The pattern for the build does have a curved leading edge. 

P.S. -- I'm not sure if you guys are talking about the banana kite or the drawing I posted. I'm talking about my drawing, but it looks to me like Wayne is referring to the banana and Zuul is talking about my drawing. Hard to tell and confusing.

Yes, I was talking about your drawing.  I suspected that the drawing was not how the kite was cut, but figured it didn't hurt to confirm.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...

×
×
  • Create New...