[HCARC] Compressed Air Gun - Antenna Launcher

[Bill Tynan]

Gary:

Gary:

Very ingenious:

Instead of the fishing sinker, you might consider the right size egg
insulator. Since they have holes, it's easy to attach the line. 

73,

Bill, W3XO



-----Original Message-----
From: HCARC [mailto:hcarc-bounces at mailman.qth.net] On Behalf Of Gary J -
N5BAA
Sent: Tuesday, January 27, 2015 8:50 PM
To: hcarc at mailman.qth.net
Subject: [HCARC] Compressed Air Gun - Antenna Launcher

Has anyone ever made or used a PVC compressed air gun for shooting line over
trees for putting up antennas??  I have solved all the parts including a
rubber tire valve already installed into a PVC pipe cap and have some 1/2
inch PVC that has a smaller inner diameter than the stuff sold at Lowes,
which just happens to perfectly fit some 3/4 ounce steel egg shaped fishing
sinkers available at WalMart.  The sinkers are almost a perfect fit for the
1/2 inch PVC.  I am using a 3/4 inch PVC in-line valve for the trigger.  The
one model I have seen in QST costs about $65.00 for $10 bucks worth of
parts.  I plan to pump the  15-18 inch long 3 inch diameter PVC reservoir
with between 70-100 psi of air.  The PVC is rated for 600 lbs pressure if I
remember correctly, so my working pressures should be safe.  I am not sure
how long to make the barrel for maximum muzzle velocity - assuming I want
maximum muzzle velocity, since I don't want to launch the bullet all the way
to the next county - just over a 50 + foot tree.

All of the PVC was purchased at Lowes except for the 1/2 inch and I have
enough to make almost anyone interested a barrel.   I'll bring the gun to
the next meeting (assuming it passes it's beta testing of course) for
general critique.  I am trying this method since most of attempts to utilize
a slingshot have met with banged up fingers and a tendency for the sinker to
curve to one side or another in flight due to the sinker being asymetrical.
The sinkers I am using are pretty regular in shape and hopefully will fly
pretty straight.  Once the PVC air chamber is charged with air, all it takes
between shots is a common hand tire pump to top off the pressure for the
next shot.

Gary J
N5BAA
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