Composite-ARF SPARK Instruction Manual page 27

Composite-ARF SPARK
that the M6 plastic bolt is screwed into, because
you need this space to move the battery plate
forward out of the rear slot, and angle it upwards
to get it out of the plane. Check this carefully
before drilling the holes for the 6mm bolt, and
gluing the front support bulkhead permanently in
place.
When you have determined the position, drill Ø
5mm right thru' the rounded tab on the front of
the battery tray and the plywood rail on the back
of the front support bulkhead, that the plastic
bolt will be screwed into. Remove the tray and
open the hole out to Ø 6mm in the tab only. Use
the short M6 bolt sup-
plied, or an M6 tap, to
thread the Ø 5mm
milled hole in the hori-
zontal rail, and then
screw the plastic bolt
in from the underside.
Do not glue the bolt in
place.
Make sure that the
bulkhead is not tight in
the fuselage and sand
as necessary to main-
tain a 1 - 2mm gap all
around it for gluing.
We have supplied it a
little too large to allow
it to be fitted in different positions, depending on
the length of your flight packs and battery tray.
Prepare the area carefully by sanding and
cleaning, and then glue the front support bulk-
head into the fuselage with a thick mixture of
slow epoxy and micro-balloons, using the bat-
tery plate (without the Lipo packs on it) as a
spacer to ensure perfect position while the glue
cures. Also glue the nose steering servo mount
to the fuselage side now.
Cooling
Remember that all the waste energy dissipated by the LiPo batteries, Speed-controller and elec-
tric motor that power your Spark is expelled as heat inside the fuselage. It is normally the Speed-
controller that has the hardest job, and gets the hottest, and it is very important that you make
adequate provision for enough cooling air to enter, and exit, the fuselage - and make sure that it
is directed over these 3 critical components, especially the speed-controller. Certainly the batter-
ies must not get warmer than 50°C maximum, the Speed-controller gets warmer than this - but
Battery tray moves forwards & then up
Plastic nut
Front support
bulkhead
Plastic bolt
Min. 10mm gap
Sideview of battery tray mounting
27
techsupport@composite-arf.com
(btm) View of underside of the front support
assembly and battery tray.
Battery tray
Balsa strips