Five different designs for Compressed Air Tennis Ball Antenna Launchers can
be found at:
http://www.qsl.net/wb6zqz/antlaunching.html
Four of these designs are under 19" in length. Pneumatics are more reliable
and more controllable than combustion and are more suitable for antenna work.
Tennis Ball launchers get right to 100-150' of height and can go above 200'
if necessary. They are a lot of fun as well as very effective.
We will be doing a session at Pacificon this year on these launchers.
If you use archery equipment we have found that heavier arrows work better
than flu-flu's. Solid fiberglass fishing arrows work fairly well. Take the
sharp point out or replace the tip with a blunt. Heavier arrows travel
slower and pull line better and come down better, as well as not going as
far if they get loose.
Be safe, be careful, don't use bow&arrows or slingshots in populated areas
- know your landing zone!
-- Alan WB6ZQZ
At 09:56 PM 9/10/2004, you wrote:
Absolutely. I have used bows/arrows, slings, etc, but a 9 ft fishing
pole, 10lb test, and a golf ball with a screw eye attached had allowed me
to place lines up to 60 feet routinely on backpacking QRP trips. Plus the
pole later froms part of a delta loop.
bb n6iz
Sandy W5TVW wrote:
I've had my best results with a 1 oz teardrop weight {painted dayglo orange!}
and a common spinning rod with 6lb monofilament line! Usually I can
cast it over the limb of my choice in 2-3 tries. Regularly get it over
50' plus
trees this way.
73,
Sandy W5TVW
----- Original Message ----- From: "Trevor Day" <[EMAIL PROTECTED]>
To: <elecraft@mailman.qth.net>
Sent: Friday, September 10, 2004 7:11 AM
Subject: Re: [Elecraft] Line into trees
| In message <[EMAIL PROTECTED]>, J F
| <[EMAIL PROTECTED]> writes
|
| snip
| >Somewhere I've seen a design for a compressed air
| >tennis ball line throwing "gun", which looks like it
| >could be fun.
| >
| >cheers,
| >Julius
| >n2wn
| >
| Although I haven't tried it, one of the larger variety of 'spud guns'
| may be useful for this. I have one which fires a spud section around
| 200 yards when powered by 'high octane' hair spray :-)
|
| The problem would appear to be how to attach the line to the spud.
| Perhaps a light basket shaped mesh material loosely arranged over the
| muzzle of the gun with a light line attached.
|
| I have just done a swift 'google' , and plans for the combustion and
| compressed air versions can be found here http://tinyurl.com/44rwh and
| at several other sites.
|
| Trev G3ZYY
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