silencing a CLUB SPORT

silencing a CLUB SPORT

Post by Alan Mcdon » Wed, 28 Sep 1994 23:08:52


Hello there !!

I have been reading rec.kites for some time now and thought it was about
time I emerged from the electronics - this is my first posting - so, please
excuse any mistakes etc.

I have been involved with kite flying for some time now together with my
14yr old son.

We have a number of single line kites (some home made by my son [a tumbling
star and a parafoil], some bought).

I fly a 6foot Flexifoil and my son has a Highflier's Club Sport and a
RevII.

Now the question - does anyone know if it is possible to substantially
reduce the noise from a Club Sport. I am amazed that some sport deltas are
so noisy - is this efficient ? I believe that in Germany there are quite
strict environmental restrictions placed on kite producers owing to the
Noise pollution lobbyists - is this true? What do others feel about the
noise?

My Flexifoil just swishes through the air, as does the RevII. Does anyone
know of a silent 8 foot sport delta? (Hopefully within the price range of a
14yr old (with a little help from dad!!!)

--
Alan McDonna, BT Labs, Martlesham Heath, England
The views expressed here are not necessarily those of BT.


Phone : +44 1473 645308
FAX   : +44 1473 646534

 
 
 

silencing a CLUB SPORT

Post by Rodger Duffe » Fri, 30 Sep 1994 00:12:59

Hi there
There have been some threads on silencing kites before so
you might like to check out the archives.

Silent kites are becoming much more popular not only from
the noise pollution point of view but also because noisy
kites are inefficient. You can either recut your trailing
edge (not to easy) or you could try adding a leach line by
threading some spectra through the trailing edge seam from
wing tip to spine tip to wing tip.

Cheerio

 
 
 

silencing a CLUB SPORT

Post by Andrew Beatt » Fri, 30 Sep 1994 15:21:59

Quote:

>Hello there !!

Welcome.

Quote:
>Now the question - does anyone know if it is possible to substantially
>reduce the noise from a Club Sport. I am amazed that some sport deltas are
>so noisy - is this efficient ?

It's not efficient and yes, it's annoying and makes kites unpopular in some
places.

Quote:
>Does anyone
>know of a silent 8 foot sport delta? (Hopefully within the price range of a
>14yr old (with a little help from dad!!!)

Since your son can sew, I'd suggest making one.  Buy Nop's "Stunt kites II".
Nop feels strongly about noise and is an experienced designer.  You'll
probably find one of the designs in his book to fit your needs.

Andrew
--
Netiquette-of-the-day: Keep your signature to 4 lines or less
You can FTP the kite FAQ's from ftp.hawaii.edu (directory /pub/rec/kites/faq)

 
 
 

silencing a CLUB SPORT

Post by Larry Navar » Sat, 01 Oct 1994 03:21:48


Quote:

>Now the question - does anyone know if it is possible to substantially
>reduce the noise from a Club Sport. I am amazed that some sport deltas are
>so noisy - is this efficient ?

You can reduce the noise made by the kites trailing edge with the insertion
of a leech line to tighten it up.  Experience has shown me though that if the
kite was not originally designed to have a leech it's flight characteristics
will change if you add one.

Quote:
>know of a silent 8 foot sport delta? (Hopefully within the price range of a
>14yr old (with a little help from dad!!!)

Most production kites that are designed with a leech line will be silent
but the additional effort required makes them more expensive.  Check
out the Tracer family or Jordan kites.  There are other production kites
that do not have a leech line that are also silent due to their design
such as the Prism kites.  These are kites I've flown, but I'm sure
there are others.

Larry Navarro

 
 
 

silencing a CLUB SPORT

Post by Marty Sasa » Sat, 01 Oct 1994 06:03:55

Quote:

>Most production kites that are designed with a leech line will be silent
>but the additional effort required makes them more expensive.  Check
>out the Tracer family or Jordan kites.  There are other production kites
>that do not have a leech line that are also silent due to their design
>such as the Prism kites.  These are kites I've flown, but I'm sure
>there are others.

If I'm not mistaken, none of Dean's kites have leech lines. For that
matter, none of the Katanas have them either.

The noise that a kite makes is an individual matter, but having a
noisy kite can be an advantage in certain circumstances. The best
example of this (one that I've mentioned before) is the routines of
High Performance.

Over the years, HP has flown noisy kites (TotL North Shore Radicals
and Spectra Competition Edges). When you snap stall a noisy kite, it
becomes silent. This really draws attention to the stall. So, HP has
all sorts of things in their routines where the kites are buzzing
around and suddenly, everything is quiet...

--
Marty Sasaki            Harvard University           Sasaki Kite Fabrications

617-496-4320            10 Ware Street               Jamaica Plain, MA 02130
                        Cambridge, MA 02138-4002     phone/fax: 617-522-8546

 
 
 

silencing a CLUB SPORT

Post by Larry Navar » Sun, 02 Oct 1994 09:54:30


Quote:

>If I'm not mistaken, none of Dean's kites have leech lines. For that
>matter, none of the Katanas have them either.

Ihad the 1994 Windborne Kitealog handy when I responded and noticed
that the description of the "8' Jordan Pro" on page 8 includes
the following sentence:
" A sewn-in Kevlar leech line keeps the reinforced trailing edge
tight and silent."
Can someone (you know who you are) clear this up?

Larry Navarro

 
 
 

silencing a CLUB SPORT

Post by AhClem00 » Sun, 02 Oct 1994 02:22:01


Quote:
Sasaki) writes:
>If I'm not mistaken, none of Dean's kites have leech lines. For that
>matter, none of the Katanas have them either.

OOPS!!  Sorry  Marty, but we've begun to make some kites with leech lines.
 Why?  Well we think there are some people who want them, we don't know.
In an effort to sell more kites(and stay in business) we've begun catering
to what we percieve people want.  The kites we are putting these in (The
Pro-Lite and New Clone) are already silent and don't depend on the leech
line for their silence.  However, it does add a minor degree of tunability
to the kites and shucks, if folks want this stuff who are we to decide
leech lines are no good?  So while we will continue to design kites that
are silent without, you are able to now get the leech line from us if you
desire.

Thanks for the oppurtunity to post this.

aoxomoxoa                i guess i better start signing with somethin
other than that as aoxomoxoa seems to be spreading.  i'll think of
something.

dean jordan                           like my name

 
 
 

silencing a CLUB SPORT

Post by Coreyki » Sun, 02 Oct 1994 13:55:14


Quote:
Navarro) writes:
>1994 Windborne Kitealog says Jordan Pro has sewn-in leech line.  Can

someone (?) clear this up?
Mea Culpa/  Mea maxima culpa.  I didn't call dean to ask, I ran my finger
along the trailing edge and the tight little seam felt like it had a line
running thru it.  And the t.e. hardly rustles so I erroneously assumed the
leech line was there.
Sorry for assuming dean needed a leech line to achieve the great flight
characteristics of the Pro.  aoxo
Corey Jensen      Writer of the Windborne Kitealog.
 
 
 

silencing a CLUB SPORT

Post by AhClem00 » Mon, 03 Oct 1994 01:10:03


Quote:
Navarro) writes:
>Ihad the 1994 Windborne Kitealog handy when I responded and noticed
>that the description of the "8' Jordan Pro" on page 8 includes
>the following sentence:
>" A sewn-in Kevlar leech line keeps the reinforced trailing edge
>tight and silent."
>Can someone (you know who you are) clear this up?
>Larry Navarro

Yep, i sure can.  The Jordan Air Pro, the kite that Into the Wind is
selling, has never had a production leech line.

It was written after they test flew the kite, they told me they were
amazed at how quiet it was and were surprised that it didn't have a leech
line.

Thanks for the inquiry.                                 Buy, Fly

aoxomo   x    o         a

 
 
 

silencing a CLUB SPORT

Post by Michael Sawy » Tue, 04 Oct 1994 13:34:16


Quote:

>OOPS!!  Sorry  Marty, but we've begun to make some kites with leech lines.
> Why?  Well we think there are some people who want them, we don't know.
>In an effort to sell more kites(and stay in business) we've begun catering
>to what we percieve people want.  The kites we are putting these in (The
>Pro-Lite and New Clone) are already silent and don't depend on the leech
>line for their silence.  However, it does add a minor degree of tunability
>to the kites and shucks, if folks want this stuff who are we to decide
>leech lines are no good?  So while we will continue to design kites that
>are silent without, you are able to now get the leech line from us if you
>desire.

Actually, considering how much difference a leech line makes on a
sailboat sail, I am suprised how few kites have them.  On sailboats
they can do wonders for stability of the leech when set correctly.
--
Michael Sawyer - My opinions are mine, not necessarily UH's, NSF's, or NASA's
University of Hawaii Physical Oceanography/Satellite Remote Sensing
PGP Key Fingerprint: F6 30 38 F5 E5 B2 13 EA  3E B3 CF 3C 6E 2E 9F D0