Sun Nov 22, 2020 8:11 pm
#1810267
matthew_w100 wrote:I'm not sure you've got the M&W quote right either.
You may be right; it was probably Tommy Cooper
matthew_w100 wrote:I'm not sure you've got the M&W quote right either.
TopCat wrote:You're not being thick.
That was an example of a variant of Muphry's law, which I'll call Topcat's law (more an aphorism, really) ... which goes along the lines of:
"Be careful when using the ' ' smiley, lest you post something that might itself deserve one".
In fairness, though, although I don't know the answer to your perfectly reasonable question, why would you slam the throttle shut in the cruise?
matthew_w100 wrote:Rob L wrote:matthew_w100 wrote:While we're on the theme, why do i get a loud exhaust pop when I close the throttle smartly in the cruise? I can't think why that would cause unburned mixture to pass through the engine.
Because it's not unburned, and it passes through a hot exhaust, which causes it to burn. So don't "close the throttle smartly in the cruise"
It reminds me of a Morecamb & Wise sketch: "Why does it hurt so much when I slap myself on my face?" (or words to that effect)
Eh? "It's NOT UNburned"? Am I being thick or is that a typo? My question is why. Closing the throttle reduces the amount of mixture in the cylinder but there is still a spark, so it should burn in the cylinder. Like it does at idle. But some leaks through unburned and goes bang in the exhaust. I say again, why?
..snip
matthew_w100 wrote:And I never "slammed" it. "Close it smartly" is what I own up to
thegasguy wrote:My jodel has a Continental C 90 -14 F and has the sort of carburettor with a the mixture control that won't provide idle cut-off; just mixture leaning at altitude
TopCat wrote:matthew_w100 wrote:And I never "slammed" it. "Close it smartly" is what I own up to
Well, whatever you call it. Why would you?
I can imagine moving the throttle from cruise setting to idle in less than 2-3 seconds - in normal circumstances - to please an instructor or examiner that wanted to see a textbook recovery from a spiral dive, but not for many other reasons, including practising them on my own.
I did it a few times a long time ago when I was measuring my minimum turnback height loss but I'd be a bit more hesitant these days. It's not that I have any reason to think it would do any damage, but I tend to treat my engine as gently as I can.
rohmer wrote:thegasguy wrote:My jodel has a Continental C 90 -14 F and has the sort of carburettor with a the mixture control that won't provide idle cut-off; just mixture leaning at altitude
What carb have you got? My C90-14F has an MA-3SPA which does have idle cut-off.
Bathman wrote:I have no idea why they are checking the mags at 1200 rpm straight after start. The oil pressure is barely in the the green, the oil temperature is firmly on the stop, and the engine is still coughing and spluttering after being parked outside overnight when it's minus two.