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Ignition System
• When making electrical connections to the ignition system, use the same gauge wire (or larger) as
used on the red and black power leads on the ignition module, all the way to the battery pack. Keep
wire length to a minimum. Heavy-duty plugs, as supplied on the ignition, or as used on electric cars
and planes, are recommended.
• Use a high quality switch such as JR's heavy-duty switch. Standard size R/C receiver switches are
not recommended.
• Make sure the charge current does not reach the ignition module. In other words don't "charge" the
ignition module.
• Keep ignition components and wiring separated, as much as possible, from your receiver, receiver
battery, servos, wiring and switches.
• Don't use metal-to-metal linkages to operate the throttle.
• Always perform a radio range check before flying. Range with one section of the antenna extended
should be at least 80 to 100 Ft. with the plane on the ground and the motor running. If there are
"glitches", DON'T FLY! Check for holes in the braided shielding, loose connections, etc.
• The ignition can be powered directly by 4 or 5 cell 4.8 or 6 volt NiCd/NiMH batteries, or 6.6 volt
A123/LiFe batteries. If using batteries rated at more than 6.6 volts, a 5.5 or 6 volt regulator must be
used. Higher voltage will damage the ignition system and will void the warranty.
• We recommend an 1800 mAh or larger capacity pack. With this size pack, the ignition should last
longer than your receiver pack will. If meter test shows 5.0 volts or less at the ignition module, don't
fly, re-charge.
• When connecting the red pick-up sensor to the ignition module, make sure that the polarity of
the wires entering the connectors is correct (Brown to brown, orange to orange)
•
Unlike some ignitions, the Desert Aircraft ignition is designed to spark only when the prop is flipped
at a high speed. If the prop is not turned over at "starting" speed, the ignition will not produce a
spark. This helps to prevent the motor from firing accidentally. The ignition coils can store energy for
a short period of time after shut off. A few firm flips of the prop with the ignition off will expend any
energy held in the coils by firing for one revolution.
• When removing the spark plug caps, PULL STRAIGHT out on the caps. Do not pull on the
shielded ignition wires! If caps seem loose and are not making a solid metal to metal contact with
the spark plug base, use a small hose clamp around the base of the cap to keep them firmly
attached to the base of the plug. To prevent radio interference, the spark plug caps must have the
split retainer ring around the base to insure a tight fit. – DON'T FLY WITHOUT THEM!
• Protect the shielded plug wires from rubbing against fiberglass or sharp edges of wood or
metal. Rubber grommets and plastic "spiral wrap" insulation from automotive or electronic supply
stores work well. Holes in the braided shielding can emit R/F noise or loose connections (spark plug
caps, connectors and switches).
• Timing is set at the factory and should not need adjustment. Contact Desert Aircraft if you have any
questions regarding timing.
• Only use NGK CM-6 spark plugs. Other plugs may not fit the plug caps firmly.
• Plug gap is .018" to .020" (.38 to .50 mm)
• Never operate the ignition without a spark plug in the plug caps! This can permanently damage the
ignition coil.
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