Wren 44 Gold Helicopter Owners Manual
Page 39
Starter noises
A screech coming from the engine during starting may indicate the O-ring in the starter is
worn. It’s easy to replace so contact Wren for a spare. Pull off the black cap first, then the
three grub screws (1.5mm hex key) around the starter nose should be slackened three turns
to allow the starter to be pulled free. The worn O-ring can be seen and picked out with a pin
and a new one popped in. Replace the starter back all the way in and then pull it back
1.5mm (1/16
th
”) to allow for clutch clearance. If you have some BLUE “Loctite” or similar
thread locking compound, a small dab on each grub screw will ensure they do not loosen.
DO NOT use green Loctite anywhere, it will be impossible to remove. Then gently and
evenly retighten the grub screws and replace the black cap.
Be aware the starter motor has magnets inside its case and if you over tighten the grub
screws you will hear a sickening crunch as the magnets break, so be gentle, nip only.
Storage
The unit does not need any special attention after running beyond those indicated. For
storage some areas should be noted:
Always
remove or disconnect the LiPo at end of the flying session. Charging must
always
be done with the LiPo disconnected but the ECU will draw a few milliamps even in the off
state and after a few weeks this can drain a LiPo to nothing and ruin it permanently.
On shutdown, oil will remain in the gearbox for the following run so it is not recommended
you hang the heli on the wall with its nose at the bottom as the lube can run out into the
exhaust area and can cause a large cloud of smoke on the next start or a mess in your
store. If you absolutely have to hang the heli on a wall, keep it nose up. Horizontal storage is
best if you have room.
Place a small polythene bag over the vent on the fuel tank to prevent your workshop dust
getting into the fuel tank and clogging your expensive filters. Use a plastic bag rather than a
solid plug as it will still allow for expansion in the tank if required.
When putting away for longer than one month, fuel pump should be disconnected from the
fuel system and filled with clean, neat oil and the pipes sealed. You can use the pump test
function on the ECU to drive it. This will stop any internal corrosion starting. To reuse, simply
drain out the oil and flush through with clean fuel and then reconnect to the fuel system.
© Wren Turbines Ltd April 2014, www.wrenturbines.co.uk,
https://www.facebook.com/pages/Wren-Turbines/154656198069224
DISCLAIMER
Gas turbine engines are a sophisticated piece of machinery. Care should be taken at
all times when using these engines. They should only be operated by those with the
appropriate skills and knowledge to do so. Incorrect operation or misuse can cause
damage to property and bodily harm to operators, spectators and animals. Wren
Turbines Limited accepts no liability for any kind of damage which may occur.
Wren Turbines Limited assumes no responsibility for any errors contained in this
document and is not liable for any damages resulting from such errors.
The use of this equipment outside Radio Control applications is forbidden, especially
those that power vehicles that carry people
