Gary wrote:
On Nov 27, 11:27�am, John Ferrell wrote:
There is an artical by W4SSY in the March 2009 QST Magazine. I am
planning to duplicate it for use at my QTH. I am interested in any
comments, especially from anyone who may have already built one.

My available trees may be about 80 feet so that is my minimum
expectations!

There is a lot of Google information available but I am trying to
focus on this example.

John Ferrell W8CCW

Hi John, I have not built one yet but am contemplating. Mine will
use a Rain Bird 1" Auto Sprinkler Valve, electrically actuated (24 VAC
or DC). I plan to use a Harbor Freigth 5 in one power source for the
air compressor, the pressure gage, and the 24 VAC actuator supply.

3 9V batteries in series makes a fine source to actuate a sprinkler
valve. Put a 0.1 uf (or thereabouts, non critical) capacitor across the
pushbutton contacts to make it last a bit longer.


The power source is $60-$90 depending on the sale going on, it is also
handy for lots of other stuff.

This will be my first shot because I have this available. As far as
the PVC, tire valve, fishing reel, ect. don't have that much
experience. As far as line, I have had one break on me after a nice
launch with a sling shot. Make sure your line is of good quality.
Happy launching.

Gary N4AST