What you got in mind Alan?
These are the FRA build rules regarding IC engines but best check with Johno first...
7. Internal combustion Engines [IC] (note: please check that your event allows IC engines.)
7.1.
Fuel capacity is limited to 17floz (500ml).
7.2
Separate fuel tanks must be made of an acceptable type of plastic (e.g. nylon).
7.2.1.
If the tank is integral to the engine assembly and is metal, the cap must be plastic or a plastic pop off seal fitted.
7.2.2.
The tank must be adequately protected from puncture.
7.3.
All fuel lines must be of the correct type and held with the correct type of fittings. They must be routed to minimise the chances of being cut.
7.4.
A return spring must be fitted to the throttle of all IC engines to return the throttle to idle or off in the case of servo breakage or failure. (This is in conjunction with any failsafes.)
7.5.
The output of any engines connected to weapons or drive systems must be coupled through a clutch which will de couple the motor when it is at idle. (This does not include motors used for generators and hydraulic pumps.)
7.6.
All engines must have a method of remotely shutting off.
7.7.
Any robot with liquid fuel and oil should be designed not to leak when inverted. (Minor leakage may be tolerated, however if it affects other robots or becomes a large cleanup issue you will be banned)
7.8.
Use of IC engines other than standard piston type (e.g. turbines etc.) must be pre approved by the event organisers.





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