Important:
The input and output starting gas tubing must be connected to the electronic shut-off
valve as per the drawing. The
gas in is towards the heat shrink tubing covered coil. The
gas out is towards the edge of the valve. It will not shut off if connected incorrectly!
Keep the tubing length short from the one/way valve to the black nylon starting gas
probe. This will minimize the amount of excess gas released when the probe is
removed from the POWERMAX can. Be careful to identify the proper end of the starting
gas probe. The probe has a barbed nipple on one end and a smooth nipple on the
other. The smooth end is inserted into the POWERMAX can.
The starting gas tank can be mounted vertically or slightly horizontally. Whether the
tank is mounted upright or slightly on its side, the nipple must always be towards the
top. This will limit the amount of liquid propane entering the turbine during startup. After
every flying session, open the release valve to empty the tank, before storing the model.
Perform this procedure in a safe area.
The propane filter is installed just before the starting gas valve.
If you are using the engine in a bypass, and it produces a bang when the starting gas
ignites, or if it is too rich and not igniting immediately, you must limit the amount of
starting gas flowing to the turbine. This is accomplished by changing the Gas Flow
percentage to a lower value in the Limits menu. Start by lowering it in 10% increments
until it smoothly ignites. This should be adjusted with a full tank of gas each time. Watch
the exhaust gas temperature each time you make an adjustment. The turbine will over
heat if the amount of starting gas is too low. When a good adjustment is achieved, it
should work unless there is a broad change in outside temperature.
Filling the Starting Gas Tank:
Only use a propane/butane mix for starting gas. JETCAT USA recommends Coleman
POWERMAX fuel (or a mix of propane butane 60/40%). POWERMAX is available at
sporting goods stores or from JETCAT USA. Use the 10.6-ounce size.
Do not use 100% propane from torch refill bottles. The pressure is too high and will
cause the tubing to rupture.
To fill the tank, insert the starting gas fill probe into the valve on the POWERMAX can.
Make sure the can is vertical since it has a clunk at the bottom. Verify that the fluid is
flowing into the tubing. Continue filling, until the fluid slows. Just before the liquid stops
flowing, remove the probe from the POWERMAX can. Although several starts are
attainable with a full tank, JETCAT USA recommends refilling before every flight,
establishing a routine that is not overlooked.
Do not over fill the on-board starting gas tank. When you notice the liquid flow into the tank start
to slow down, stop filling. You will prevent any tendency to "pop" on start up, while still having
enough gas for 2 to 3 auto starts.
23
To Next Page
Loading...
Need help?
General
