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Old 06-20-2018, 11:12 AM   #1
Vino
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Default Engine sputter

I haven't flown this bird for a long time, so I hardly remember everything. During yesterdays flights (I had 3 of them) and today, I had engine sputter after ~1 hour flight. Every time. The pressures and temps were ok. No battle damage. I landed the plane safely, but after the touchdown the engine stops. Any ideas? I flew below 1km most of the time about ATA 1.1.
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Old 06-20-2018, 01:07 PM   #2
saburo_cz
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just guess, what was your fuel quantity after one hour long flight at low altitude?
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Old 06-20-2018, 01:08 PM   #3
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Quote:
Originally Posted by saburo_cz View Post
just guess, what was your fuel quantity after one hour long flight at low altitude?
About 50%
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Old 06-20-2018, 08:19 PM   #4
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Sparkplug fouling, if it's implemented?

I know the P-51D manual has notes about needing to run at max rpm/boost every now and again for a minute or so.
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Old 06-21-2018, 05:13 AM   #5
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^ I've read it is implemented, but in this particular case flying with 1.1 ATA of boost shouldn't cause any harm I suppose, 'cause it's normal, recommended cruise setting.
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Old 06-21-2018, 11:36 AM   #6
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Regardless of the type you fly, you shouldn't let the engine idle for long because that, AFAIK, is what fouls the plugs. But this definitely shouldn't happen when you're airborne and cruising along...
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Old 06-21-2018, 02:56 PM   #7
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Okay, I tried it myself: Flying 1.1 ATA for 1h15min under 1km with Auto governor on and radiators automatic. External temp was 25°C and all the pressures and temps of the plane stayed in the green.


BUT, I got no stutters or what so ever. Engine worked like a charm and even after touchdown no probs at all.


The only thing I noticed was that with auto gov and 1.1 ATA the rpm dropped to 1850 which looks a little low for my taste. Need to check the manual for the correct values for cruise.
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Old 06-22-2018, 06:41 AM   #8
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I did a test flight. Every 15 minutes I gave the engine some rought time. No sputtering. So I guess it was a fouling plugs after all.
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