Whereas the propeller should be treated as potentially live and dangerous at all times,
it is uncommon for an engine with this ignition to backfire, snap or bite. The
ignition will trigger a spark irrespective of the speed that the magnet passes the Hall
Effect sensor, so it is not necessary to flip the prop with all your might, just flip it
through compression and stay clear.
Pull the plug cap off straight when removing, do not pull on the shielded ignition
wires. The spark plug cap must have the split retainer ring fitted, flying without this
retainer can cause RFI and unreliable operation.
There are mixed views regarding the safe proximity of the ignition components
(including switch and battery) to the receiver and associated components. Whereas
we have a documented case where the ignition and receiver battery packs were
actually placed together in the tank bay (CG consideration) on a 35 MHz installation
without any problems, we do suggest maintaining whatever separation may be
available between the ignition and components and the receiver and components.
Spark Plug:
JC Engines are supplied Rcexl CM 6 spark plugs. We have seen plugs of low
quality on other engines, but we have had no problems with the supplied plugs on any
of the JC Engines, despite many hours of operation. Some experienced modelers
recommend the use of NGK CM-6, these are available from your distributor.
Fuel and Oil Mix
Just about any clean fresh petrol without moisture will work in your JC engine, but
unleaded petrol is recommended. Some flyers have used Avgas without any
problems, but this offers no advantage, is more costly and more difficult to locate -
petrol is available on every other street corner.
We recommend filtering your fuel between your fuel container and your fuel tank,
plus a high flow filter, or clunk/filter, between the tank and motor. Ensure that the
tank is well vented and that the clunk moves freely without snagging on the back of
the tank.
Use of any other fuel or additives such as methanol, nitro formulas are not necessary
and may harm the motor.
Do not use any silicon tubing or sealers anywhere in the fuel system as petrol will
break it down causing leaks and poor engine operation.
