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P a g e
Edge 540/2.6m
At this point in the assembly process it pays to think about where
you wish to place your ignition, ignition battery, kill switch and
receiver batteries. If you are using one of the current crop of light
weight engines such as the DA120 (2.25kg), you will need to place
as much of the on board weight as far forward as possible to
obtain the required C of G. Obviously if you are using an engine in
the region of 3kg this is less critical.
The ignition and ignition battery can always be attached to the
engine dome using zip ties, and or Velcro straps. If you choose to
mount them this way ensure you use high density foam around
these items to protect them from excessive vibration. Do not pull
the zip ties down too tight!
One option is to place all of the batteries on a tray mounted behind
the firewall. This is a pretty simple process which will require some
3mm ply to make the tray. The ply tray needs to be shaped to fit
behind the firewall inside the engine dome. The tray is shaped like
a blunt pyramid, and measures 17cm at the front, 28cm at the rear
and is 10cm deep. These measurements may vary slightly from
model to model, so make a cardboard template first, then, you can
make any adjustments necessary before you start cutting ply.
How you place the items on the tray is dependent on the
equipment you choose. As you can see from the pictures, we had
no trouble fitting everything we needed on the tray. One other
advantage of the tray is, you can mount the throttle servo
underneath it. When mounting the tray inside the engine dome,
keep in mind the throttle servo position. If positioned correctly you
will have a nice straight path for your throttle push rod. We have
provided a plywood throttle servo mount in the hardware pack for
you.
For the DA120, the throttle servo arm needed to be positioned
approximately 50mm from the LH front inner corner of the engine
dome. However please take some measurements to verify the
position that suite your requirements.
Ignition and battery mounting