user manual

MNM©2009
KTT©2011
Page 17
Gas installation
Some modelers prefer onboard gas installation. When setup correctly no connections
to jet is needed when startup. If you will not use onboard gas, then you may skip
these steps. 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.
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 % to a
lower value. 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 starting gas
Only use a propane/butane mix for starting gas. We recommend Coleman
POWERMAX fuel (or a mix of propane butane 60/40%). 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