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Hi Gary, its always good to know why your engine coughed and died,maybe it needs a needle tweak, have you found a reason for the stronger then normal gravity under your aircraft.
Dave.

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hi Gary, the RXL ignition has a metal outer cable (I have put the same on my 3W) that is the return for earth so as long as the cap is all the way down on the plug it is earthing.
With the pump on the carb it does not matter which way the engine is positioned.
With the RXL. ignition pack you get a timing wheel i hope you timed your engine with it about 27 degrees BTDC.and did not just guess where the pick-up magnet should go.
It looks to me that a bench run and needle tweek is in order.
Dave.

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I'm interested to see the outcome of your analysis. None would doubt that you made the right decision regarding putting it down, which was done quite well, but I'd hate to see you roll the dice again without really knowing what happened.

I would normally approach this thing from what we know are the top three reasons why petrol engines run bad. The first is the ignition battery, but if you can verify that it is providing a good 4.8v to the ignition module then that's ok. The second is needle tuning, but if it is providing good rpm on the ground with no sag when loaded on an upline, and the transition from idle to max is ok, then it's not that. Failing that it is ignition timing, but you say it's not adjustable? but as far as I know all ignition systems need to be statically timed even if they have electronic advance / retard.

Also, the question of the touch and go knocking of the plug cap? I think that landing would have nowhere near enough impact to bounce off a rexcel plug cap. If it's pushed on nice and firm and the hex section of the CM6 is covered by the plug cap housing then I think you need to look elsewhere. This is assuming that the cap is in good condition and has not had a proper whack at sometime in the past, which can damage the nylon sleeve inside. Any damage here is normally visible if you look inside the cap though.

Can you give more information on the engine and ignition system you are using? Also, I've never heard of the "lean oil ratio" as a cause like you say. Generally if you are running more oil than 50:1 good quality oil you will not find issues with the running, but leaner than that you just risk premature wear. I use a 40:1 synthetic mix myself which gives plenty of margin.

Obviously there's lots to try and cover here and I'd like to make sure that all is well before committing aviation again with that lovely plane. If all else fails on here to find the cause, then a post on Flying giants in "Gas engines and power" section would definitely promote some debate and maybe even a correct diagnosis. There is plenty of experience on there and people who are willing to review the video. I'm pretty sure someone there could put their finger right on it.

Michael.

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OK then, Great flying! Carry on and good luck with it!

Michael.