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Despite designing and making two options, an electronic time delay off switch to work off a 3.7V Li ion cell and a centrifugal switch I found out that for the short duration of the tethered car run you can just connect a 1.25V Ni Mh cell for the duration of the 'start plus run' and the glow plug...

Interesting idea, I might have one of those kicking about spare, thanks for the idea.

Thank you, yes I have measured the glow plug current out of the engine and it is around 3A when using a plug in 1.2v NiMH igniter Thank you for the ideas everyone, I’ll have to try a few out.

I did consider this, but I have not seen a car started like this, perhaps holding the rear driven wheels up and give it a helping hand launch would do? I’ve not tried it yet as the car is still being built up. I guess I could plug the igniter in, tied to a brick with a long string and set the...

I like your thinking @tudordewolf i did also consider a small primary cell, but a capacitor would be less wasteful and would have no issue with high impedance

Bit silly really but there is a track 6 miles from where I live and I felt the need to join in and not to just be a spectator. I liked the simplicity but it seems to be getting more complex by the minute.

Fair question @Tunedpipe , tethered cars are tied to a central post by a wire and are free running on a circular track until the fuel runs out. The object being the fastest lap time. To start them you push them with a pitchfork like object, no clutch. So with a glowplug engine you need to apply...

I have been persuaded to incorporate an automatic glow plug controller in my tethered race car. The type of thing that allows you to press a button to energise your glow plug from a small on board battery which times out after say 20 seconds, long enough to get a warmed up engine away. The thing...