alan_k Posted September 22, 2020 Share Posted September 22, 2020 Well I suppose you could say they are all unexpected, but this one particularly so. I had found a failed plug on my last attempt to fly so had ordered a couple of spares and fitted one to the V5. Took off about 5:20pm and was expecting to have an hour and a half flight, lovely conditions. Had just fitted a brand new spark plug.About half way around felt a couple of little mis-fires, then a couple more. Thought I would go to max revs to gain more height, I was at around 1000 feet.Lots of misfiring up to max revs then 1 second later silence (To put in aviation terms the donkey stopped). This sounds terminal I thought, gave it one pull on the starter but nothing. I was near the river Severn so middle of nowhere, looked around for a farm house with at least a car outside, spotted one and a suitable field opposite. Adjusted to slow trims for max glide distance but still had loads of time to descend, a little S turn to get into the field safely and I was down.Folded the wing up then went and spoke to the farm occupants. Initially they were up for giving me a lift but then decided with the late hour the animals had to be fed before dark. No hassle, friendly people so I called my mate Geoff and he came and rescued me. I am guessing the new plug has failed, I will be investigating later.Now there is a tale for round the camp fire in the future. Quote Link to comment Share on other sites More sharing options...
Steve Posted September 22, 2020 Share Posted September 22, 2020 I've had similar - sadly, there are duff new plugs out there. Glad the landing was a good one. Quote Link to comment Share on other sites More sharing options...
Blackburn Mark Posted September 22, 2020 Share Posted September 22, 2020 Strange, cant see a new plug failing... Ill look forward to your investigation. I keep getting a strange one on my V2, during hard climbs it will miss a couple of beats or cut for a second or so... I have never worked out what it is, I think it might be a sticky exhaust valve (sticks slightly open when very hot) Quote Link to comment Share on other sites More sharing options...
alan_k Posted September 22, 2020 Author Share Posted September 22, 2020 Looking now like it is a stator coil failure (AGAIN, this is ticking me off big time). The resistance is only reading about 1/2 of its original resistance. Quote Link to comment Share on other sites More sharing options...
Steve Posted September 22, 2020 Share Posted September 22, 2020 44 minutes ago, Blackburn Mark said: Strange, cant see a new plug failing... Ill look forward to your investigation. I've had two defective new plugs in ten years. Swapping for an alternative new plug solved the issue in both cases. Quote Link to comment Share on other sites More sharing options...
Blackburn Mark Posted September 22, 2020 Share Posted September 22, 2020 33 minutes ago, alan_k said: The resistance is only reading about 1/2 of its original resistance. I personally would attempt to count the winding and "roll my own" (maybe subtract a few windings to lower the voltage) Are they tough to get to/remove? Quote Link to comment Share on other sites More sharing options...
alan_k Posted September 22, 2020 Author Share Posted September 22, 2020 No, I have replaced one already on this machine last year (hence I'm getting ticked off). You need to pull the rotor off which is the difficult part, then all is revealed. Bailey fitted a new one recently and I have only had 5 hours flying, so I have sent an email. Quote Link to comment Share on other sites More sharing options...
Blackburn Mark Posted September 22, 2020 Share Posted September 22, 2020 Just now, alan_k said: only had 5 hours flying Owch! If they are anything like the original GY6 stator, I think I would be considering winding up one of the redundant coils as a second ignition coil. 5 hours would make me bloody nervous! 1 Quote Link to comment Share on other sites More sharing options...
asquaddie Posted September 22, 2020 Share Posted September 22, 2020 Seems like it happens more frequently than we think! Maybe worth sticking a spare in the tool kit. Then it would be a simple landing (we hope), swap it over and off we go again - may even get a cup of tea and wee stop if you're lucky. Tony Quote Link to comment Share on other sites More sharing options...
Hann__ Posted September 22, 2020 Share Posted September 22, 2020 8 hours ago, Steve said: I've had similar - sadly, there are duff new plugs out there. Glad the landing was a good one. It`s definately not unknown, at least in the motorcycle community, to hear of `dead on arrival` plugs. Wasn`t an NGK by any chance was it - they`re the worst offenders..... Quote Link to comment Share on other sites More sharing options...
Steve Posted September 22, 2020 Share Posted September 22, 2020 3 hours ago, Hann__ said: Wasn`t an NGK by any chance was it Certainly was. Quote Link to comment Share on other sites More sharing options...
admin (Simon W) Posted October 2, 2020 Share Posted October 2, 2020 Regarding new plugs not working... When we were into drag racing, we would buy our plugs by the pack of 50. It would not be uncommon for 5 (or so) of them to fail after the first few second in an engine. You DEFFO can have a dead, new plug. (thats one of the reasons that when you buy a Vitto engine you will notice that the plug has already been used for the factory test run. the same one is left in because it's known to be a working one SW Quote Link to comment Share on other sites More sharing options...
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