Recommendation Please

Recommendation Please

Post by ae.. » Tue, 18 Jul 2000 04:00:00


I would like to hoist about 35 pounds of wire antenna and feed line in
the air aprox. 200 feet. I could possably use a smaller feed and get
the weight down to about 16 pounds if necessary. Could someone
recommend  a type of kite and size(Delta, box, parafoil...) and where I
may purchase one. This is for amateur radio operation and will be done

Sent via Deja.com http://www.deja.com/
Before you buy.

 
 
 

Recommendation Please

Post by Dr Mik » Tue, 18 Jul 2000 04:00:00

Hi
Dan Leigh's kites have already lifted an arial for the TV program " The
Secret Life of the Radio"
He also makes deltas that lift cameras or falcon training lures/ bait
droppers.
www.deltas.freeserve.co.uk
Cheers

Dr Mike

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Quote:

> I would like to hoist about 35 pounds of wire antenna and feed line in
> the air aprox. 200 feet. I could possably use a smaller feed and get
> the weight down to about 16 pounds if necessary. Could someone
> recommend  a type of kite and size(Delta, box, parafoil...) and where I
> may purchase one. This is for amateur radio operation and will be done

> Sent via Deja.com http://www.deja.com/
> Before you buy.


 
 
 

Recommendation Please

Post by metr » Tue, 18 Jul 2000 04:00:00

a small to medium parafoil would more than do the trick. You'd probably want
to stay away from 2 or 4 liners and stick to single line kites. A 2 square
meter kite (which you could get used for under $200) can easily lift your 36
pounds in a decent breeze.

You may want to check out the "Parastunter", a small foil type kite for
around 50 bucks. It might be a bit small though and its 2 lines. But you
cant beat the price.

----------

Quote:

> I would like to hoist about 35 pounds of wire antenna and feed line in
> the air aprox. 200 feet. I could possably use a smaller feed and get
> the weight down to about 16 pounds if necessary. Could someone
> recommend  a type of kite and size(Delta, box, parafoil...) and where I
> may purchase one. This is for amateur radio operation and will be done

> Sent via Deja.com http://www.deja.com/
> Before you buy.


 
 
 

Recommendation Please

Post by Mark de Roussie » Wed, 19 Jul 2000 04:00:00

Quote:

>a small to medium parafoil would more than do the trick. You'd probably want
>to stay away from 2 or 4 liners and stick to single line kites. A 2 square
>meter kite (which you could get used for under $200) can easily lift your 36
>pounds in a decent breeze.

I beg to differ. IMHO there isn't a cat's chance in hell that a two square meter ( 20
sq foot ) single line foil is going to reliably lift 36 pounds ( 15kg ) in anything
less than an outright gale. I'd be surprised indeed if it could manage 15lb's
'easily'. If it flies at 70degrees and the line weighs 1 pound, its got to be pulling
39 pounds just to stay in the air ( i.e. anything less, and its coming down ).

If it starts to drift down from that 70degrees, the tension required to stay in a
'lifting' as opposed to 'landing' mode increases dramatically ( although in this case
I suppose that you need only take into account the length of ariel that's actually
off the ground, which would help to offset the effect ). At 60degrees, you'd need it
to pull 45lb just to stay up. You'd want a safety margin - so say it should be
pulling 55lb ( 25kg ) plus at all times.

Now, this might not sound like alot, but 100lb line would be at or slightly beyond
it's normal breaking point and would be like cheesewire, 150lb dacron line would be
so taut you could flick it with your finger and it would 'ring', 300lb dacron line
would be difficult to put a kink in with your fingers. How often have you flown a 2m
single line foil in a 'decent breeze' and observed line tension of this order ? I've
tensioned up lines from 20lb to 300lb on a jig, and it never failed to surprise me
just how *little* force was required to put an apparently ( in kiting terms ) large
strain on a line ( and how much it stretched before it got there, in the case of
dacron ). It struck me that I'd probably never even approached the breaking strain of
my line when flying, even when I was so concerned that I'd brought the thing down and
put on a heavier line.

I've got a 42 sq ft foil, which I suspect might lift 36lb in a strong wind, but I
certainly wouldn't want to bet on it without trying it first. And if the wind dropped
to below the '39 pounds' level even briefly, I'd expect to see it come down fast.

                                        MdeR.
---
PGP Key from ldap://certserver.pgp.com, http://pgpkeys.mit.edu:11371

 
 
 

Recommendation Please

Post by Marty Sasak » Wed, 19 Jul 2000 04:00:00

Let me agree with Mark de Roussier.

Kite pull is really deceiving. I once measured the pull of an 80 inch
tall rokkaku in winds between 12 and 15 mph. It felt like it was
pulling like crazy, but the actual pull was less than 50 pounds. And
that is just pull, i.e., both the horizontal and vertical components
added together. The actual lift was probably less than 30 pounds (I
don't remember the angle of the flying line.

        Marty Sasaki

 
 
 

Recommendation Please

Post by ae.. » Fri, 21 Jul 2000 04:00:00

Thanks a whole bunch for all of the great input. It sounds like a
little fun and expermentation are on the way. If I get a nice kite and
it can't quite do the job pulling an antenna up, who knows...maybe I
can send my wifes dog up!.....Just kidding! Regards, John

Sent via Deja.com http://www.deja.com/
Before you buy.

 
 
 

Recommendation Please

Post by Mark de Roussie » Sat, 22 Jul 2000 04:00:00

Quote:

>Thanks a whole bunch for all of the great input. It sounds like a
>little fun and expermentation are on the way. If I get a nice kite and
>it can't quite do the job pulling an antenna up, who knows...maybe I
>can send my wifes dog up!.....Just kidding! Regards, John

Yeah, I can see it now - a sponsored dog - lift ! I guarantee alot of sponsorship
from kitefliers :). Including several with a sudden interest in manja equipped
fighters...

I think the basic answer to your original question is that you will need *alot* of
kite. The first large-ish kite I ever got was a 12ft Dan Leigh camera - lifting delta
- that doesn't have anything like the lift you need. Like I said, a 40 - 45sq ft foil
might just cope in a *strong* wind. But to extend your wind range down to a more
reasonable level, I think you have to be thinking 50+ sq ft. This kind of grunt
doesn't come cheap.

                                MdeR
---
PGP Key from ldap://certserver.pgp.com, http://pgpkeys.mit.edu:11371

 
 
 

Recommendation Please

Post by Simon Hennesse » Sat, 22 Jul 2000 04:00:00

We have a member in Brighton Kite flyers who uses a kite like this I will
contact him and see if I can give you his details.

Simon Hennessey
BKF Secretary

Quote:

> I would like to hoist about 35 pounds of wire antenna and feed line in
> the air aprox. 200 feet. I could possably use a smaller feed and get
> the weight down to about 16 pounds if necessary. Could someone
> recommend  a type of kite and size(Delta, box, parafoil...) and where I
> may purchase one. This is for amateur radio operation and will be done

> Sent via Deja.com http://www.deja.com/
> Before you buy.