Wren 44 Gold Helicopter Owners Manual
Page 30
Area Clear?
Select a clear area for running – keep clear of areas with loose leaves, sand or other debris
that could be picked up or drawn towards the rotors and intake.
Turn on the receiver and verify the screen shows a reading.
Using the up ”^” arrow enter the 3rd screen and enter the “RADIO
”
menu and perform the
transmitter setup, if not already completed.
Connect the charged 2-cell LiPo battery. Turn on fuel if you have fitted a shutoff tap between
pump and valves (preferred position).
Ensure trim and stick are at zero. Enter “INFO” menu and go down the entries until you get
to “test” functions. Find “Test/Prime Pump”. Press “On” button to turn on fuel pump and
watch fuel travel along from the tank to the engine. Press “Off” to stop.
Go further down “INFO” menu to “Prime Burner On Off”. Press “On” button and watch fuel
travel to engine, then press “Off” to stop. Do not prime longer as you risk pouring fuel into
the engine which
will
cause a flaming start. Small bubbles in the pipes at this stage will not
prevent a start, just delay it or make it a little longer.
You should not prime the pump again unless you have completely drained the fuel system.
Confirm the battery is freshly charged and connected up. Go into the 2
nd
screen of the
display where you will see the battery voltage indicated – confirm you have 8.2v or more to
indicate a charged LiPo.
Go back to the opening screen on the display.
Confirm there is an ambient temperature reading on the HDT.
Starting the engine
Display shows “Trim Low”
To initiate the start, raise trim to full, (blue led in ECU lights and screen shows “Ready”).
Place stick to full and back down quickly.
(Holding the stick at full will spin engine at full
power – can be used to cool down from a previous hot start or run)
Starter will spin engine briefly and then power igniter (screen shows “Glow Test” then
“Burner On”).
[To initiate start without spinning engine raise trim to full, raise stick half way and back down]
Igniter will heat and after some seconds starter will spin engine slowly, pump will turn on
slowly, igniter valve ticking. If pump does not come on raise “
pump power ignition kero
” until
it does.
You should hear a gentle plop and combustion starting in the engine and temperature rise
on the display. (Screen shows “Preheat”).
After some seconds engine speed and temp’ will increase, valve pulsing will speed up and
the main fuel valve begin to open and engine begins accelerating past 15krpm, (HDT shows
“Switchover” then “Fuel Ramp”). If engine flames out at switchover, increase “
pump start
point
” until it continues. (Sometimes needs to be “40” or more).
