I have found that fishing line is the only option. They have little air
resistance unlike the spun wires/ropes.
I don't know exactly how the wind resistance increase with length but assuming
it is linear with length you can realize, as the force is square to speed you
will see were little increase in hight as you increase the initial speed (by
increasing the pressure).
Change to fishing line and you will get your hight.
Hans - N2JFS
-----Original Message-----
From: Jim Pruitt <jpruitt67@gmail.com>
To: TowerTalk <TowerTalk@contesting.com>
Sent: Tue, Feb 21, 2017 2:14 am
Subject: Re: [TowerTalk] Antenna launcher found
The airboss looks a lot like the W4SSY "Spudgun" that appeared in March
2009 QST. I built a variation from those plans. I used a manual valve
(pvc valve) rather than the electric. I used a projectile made from 1/2"
pvc pipe with a pipe cap on it. No matter how much I pumped it up it would
not go more than 30ft. Too be fair though I was shooting 1/8" electrical
pull twine rather than a fishing line. It still baffles me why more air
did not equate to going higher. I also had an air chamber 3" id and 18"
long so it should have had the umph to go as high as I wanted it to go!
Thank you.
Jim Pruitt
WA7DUY
On Mon, Feb 20, 2017 at 4:19 PM, W0MU Mike Fatchett <w0mu@w0mu.com> wrote:
> You can build the Air Boss or similar from parts at your favorite big box
> store and you will need a valve stem from the auto parts store. This is by
> far the easiest method I have tried and I had fun making it. It will fire
> the weights a long way up in the air. The issue I had was finding the line
> where it came down as fishing line is really hard to see. I would also
> suggest the spider wire. While expensive relative to other line, it is
> super strong.
>
> W0MU
>
>
> On 2/20/2017 10:26 AM, Jeff Draughn wrote:
>
>> Same here used it just this weekend, works like a champ!!
>>
>> Jeff, N0OST
>>
>>
>> On Mon, Feb 20, 2017 at 8:54 AM Hardy Landskov <n7rt@cox.net> wrote:
>>
>> Hi William,
>>>
>>> I am with you. The air boss is very good and more accurate than the
>>> tennis
>>>
>>> ball kind. (More mass, less drag.) But if you accidently got hit by one
>>> at
>>>
>>> close range you would be in a world of hurt medically.
>>>
>>> Now I need to find bottles of compressed air. The bicycle pump is ok but
>>> can
>>>
>>> be tiring.
>>>
>>> Another hint: Paint your weights with fluorescent paint. Makes them
>>> easier
>>>
>>> to find.
>>>
>>> Hardy N7RT/4
>>>
>>>
>>>
>>> -----Original Message-----
>>>
>>> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
>>>
>>> william radice
>>>
>>> Sent: Monday, February 20, 2017 9:09 AM
>>>
>>> To: towertalk@contesting.com
>>>
>>> Subject: Re: [TowerTalk] Antenna launcher found
>>>
>>>
>>>
>>> :::: How is it that all of you seem to be unaware of the fabulous antenna
>>>
>>> launcher called the Air Boss?? No one seems to have mentioned it
>>>
>>>
>>>
>>> http://www.kr4loairboss.com/
>>>
>>>
>>>
>>> I've had this thing for several years and I can out up a wire anywhere,
>>>
>>> anytime, in a few minutes. Why would you need anything else?
>>>
>>>
>>>
>>> BILL
>>>
>>>
>>>
>>> On 2/20/2017 8:08 AM, Patrick Greenlee wrote:
>>>
>>> Be careful, be very careful. There is a reason PVC pipe is not allowed
>>> for
>>>
>>> distributing shop air. People do it out of ignorance or because money
>>> means
>>>
>>> more than safety to them. Google to see some pix of what shrapnel damage
>>>
>>> from exploding PVC pipe can do. Because people aren't killed first time
>>>
>>> every time they pressure up PVC pipe doesn't mean it isn't dangerous.
>>>
>>>
>>>
>>> I bought a tennis ball launcher as a birthday gift for a friend. If I
>>> recall
>>>
>>> correctly it is called a K-9 Kannon. It is made of plastic and uses
>>> large
>>>
>>> rubber bands for launching the ball, ostensibly for a dog to retrieve,
>>> hence
>>>
>>> the name. There are several models ranging in cost from about $7.50 to
>>> $20.
>>>
>>>
>>>
>>> Patrick NJ5G
>>>
>>>
>>>
>>>
>>>
>>> On 2/19/2017 10:42 PM, Mickey Baker wrote:
>>>
>>> Being the cheap ham that I am, I built one from the plans on that site,
>>> but
>>>
>>> a but a bit more robust.
>>>
>>>
>>>
>>> I can launch a standard new tennis ball 250 meters at a ground level
>>> target
>>>
>>> and much taller than anything around here. I have ropes in 70 foot pine
>>>
>>> trees supporting wire antennas.
>>>
>>>
>>>
>>> I hate the fishing reel that I'm using, so I should probably upgrade the
>>>
>>> reel.
>>>
>>>
>>>
>>> There's some margin for safety built in, but I wouldn't inflate more than
>>>
>>> the recommended pressure with a PVC pressure vessel. A failure could be
>>>
>>> dangerous.
>>>
>>>
>>>
>>> Be safe, a tennis ball could hurt someone!
>>>
>>>
>>>
>>> 73,
>>>
>>>
>>>
>>> Mickey N4MB
>>>
>>> _______________________________________________
>>>
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