P-51 is the most environmentally friendly aircraft in the world

[Yo-Yo]

Yo-Yo, why is ignition timing dependant on throttle and not on RPM? Does the speed of the flame front depend so much on boost pressure?

 

Ignition advancing in R-R engines was mechanically linked to the throttle. There is no vacuum or centrifugal corrector as we had had in the car engines till they became fully processor controlled.

 

So, it was presumed that rpm is a function of MP... that is right if you handle the engine with care.

[Echo38]

So you've tried track 2 & 3 and you get an engine failure?

 

I am seldom able to fly this sim because my old hand injuries do not permit me to use a joystick often. When I do get to fire up the sim, I'm not going to spend my rare sim-time doing tests. So, no, I haven't looked at any of your tracks. I just don't have the energy to do tests now that I'm practically unable to fly. When I was a beta tester for R.o.F., I would spend hours testing boring things on the ground, but then I would blow off steam by spending more hours having fun dogfights in the air. Once I became unable to fly because of my hands, I withdrew from the beta team; I no longer had the heart to spend hours working with the virtual aircraft on the ground, when I was was unable to fly them. Similar situation here.

 

Meanwhile, I'd like to present a counter-challenge: have you tried my suggestion? It is, after all, you who are experiencing this problem, and not me.

[bkthunder]

I am seldom able to fly this sim because my old hand injuries do not permit me to use a joystick often. When I do get to fire up the sim, I'm not going to spend my rare sim-time doing tests. So, no, I haven't looked at any of your tracks. I just don't have the energy to do tests now that I'm practically unable to fly. When I was a beta tester for R.o.F., I would spend hours testing boring things on the ground, but then I would blow off steam by spending more hours having fun dogfights in the air. Once I became unable to fly because of my hands, I withdrew from the beta team; I no longer had the heart to spend hours working with the virtual aircraft on the ground, when I was was unable to fly them. Similar situation here.

 

Meanwhile, I'd like to present a counter-challenge: have you tried my suggestion? It is, after all, you who are experiencing this problem, and not me.

 

Sorry to hear about your hand condition :(

Yes I have tried your suggestion and I have the same problems (plus that whining sound after the patch). So far I don't think it's a matter of mission settings...

Btw I asked you to try out the tracks so we could gather more data since Jcomm is also experiencing some of my same issues. Wasn't intended to be a comeback on your previous post ;)

[Ramstein]

Here how a start looks like on a V12 Allison. Fresh new engine. ( mind this is a Yak9-U(M) )

 

 

Need help to design a yak9 ? I'm up for it :)

 

 

too me this thread sounds like people want the effects from a radial engine on a liquid cooled inline... these are smooth running engines and do not lope... a smooth power band up and down the range... the only thing that sucks is the golden bb will always kill the glass jaw...

 

there is no flaming, huffing and puffing... not with this plane...

 

sure there is the blue flames out the exhaust,, that's all... if there is huff and puff, it's blowing up...

 

:doh:

[bkthunder]

Ignition advancing in R-R engines was mechanically linked to the throttle. There is no vacuum or centrifugal corrector as we had had in the car engines till they became fully processor controlled.

 

So, it was presumed that rpm is a function of MP... that is right if you handle the engine with care.

 

This is very interesting, I'd love to see a drawing of the distributor and the link to the throttle :book:

 

But, doesn't this mean that rapid throttle movements should have a very bad effect on this engine? I mean, it is actually modeled that the engine sputters a bit if you go from idle to max too quickly, but that doesn't seem to cause any deterioration even after doing it a hundred times in a row

[Yo-Yo]

This is very interesting, I'd love to see a drawing of the distributor and the link to the throttle :book:

Google please V1650-7 manual or R-R manual. There are a lot of drawings there.

But, doesn't this mean that rapid throttle movements should have a very bad effect on this engine? I mean, it is actually modeled that the engine sputters a bit if you go from idle to max too quickly, but that doesn't seem to cause any deterioration even after doing it a hundred times in a row

 

This kind of deterioration is not investiagated in RL - how many movement you must do to have the effect. Continuous overboosting is more investigated... :)

[Anatoli-Kagari9]

This kind of deterioration is not investiagated in RL - how many movement you must do to have the effect. Continuous overboosting is more investigated... :)

 

Fair enough Yo-Yo, at least as far as I'm concerned...

 

Yesterday I decided to simulate flight under real heavy Winter conditions. In what other sim do I get those same results? None!

 

My engine was a nightmare to get running, and then on final, and although icing is not simulated, I had to carefully manage power, and the radiators! Temperature was very low (-15C), and precipitation (snow) was deteriorating my landing conditions... It was a great experience :-)

Edited May 25, 2013 by jcomm

[bkthunder]

Since a couple of days, I seem to be experiencing engine failures like the rest of you, strange enough, it seems that it all suddenly started to work properly after I played Jcomm's track...oh well, let's hope it stays that way even though this is puzzling beyond belief.

 

Yo-yo, is spark plug fouling modeled? I have yet to see it happen and now I'm wondering if it's still just me or if it simply isn't modeled.

 

This kind of deterioration is not investiagated in RL - how many movement you must do to have the effect. Continuous overboosting is more investigated...

 

Yep, fair enough also for me.

[NineLine]

Since a couple of days, I seem to be experiencing engine failures like the rest of you, strange enough, it seems that it all suddenly started to work properly after I played Jcomm's track...oh well, let's hope it stays that way even though this is puzzling beyond belief.

 

Yo-yo, is spark plug fouling modeled? I have yet to see it happen and now I'm wondering if it's still just me or if it simply isn't modeled.

 

 

 

Yep, fair enough also for me.

 

 

Why might you be fouling plugs?

[Merlin-27]

Why might you be fouling plugs?

 

One thing that comes to mind is running at very low engine speeds. It was said to build up carbon on the plugs in RL. This is why you sometimes read about running up the engine after leaving the taxiway to resolve a rough running Merlin. I have not seen this specifically in the sim but I can't say I've really looked for it either.

[NineLine]

One thing that comes to mind is running at very low engine speeds. It was said to build up carbon on the plugs in RL. This is why you sometimes read about running up the engine after leaving the taxiway to resolve a rough running Merlin. I have not seen this specifically in the sim but I can't say I've really looked for it either.

 

 

I would think maybe prolong low RPMs might cause this, but I dont see a situation where you would be running around at low RPMs for long periods of time... be worth trying I suppose, but doesnt seem like normal operating so not sure when that would arise... I would image the focused on engine trouble in combat conditions more than taking a long, slow cruise on the taxi way :)

[Merlin-27]

I would think maybe prolong low RPMs might cause this, but I dont see a situation where you would be running around at low RPMs for long periods of time... be worth trying I suppose, but doesnt seem like normal operating so not sure when that would arise... I would image the focused on engine trouble in combat conditions more than taking a long, slow cruise on the taxi way :)

 

I totally agree... I was just answering the question. This would be akin to simulating the sore butt effect after a 4 hour cakewalk mission.:megalol:

[NineLine]

I totally agree... I was just answering the question. This would be akin to simulating the sore butt effect after a 4 hour cakewalk mission.:megalol:

 

 

And fouled shorts :)

[Yo-Yo]

I would think maybe prolong low RPMs might cause this, but I dont see a situation where you would be running around at low RPMs for long periods of time... be worth trying I suppose :)

 

One hour of cruise flight (2000/35") - and the AI you meet will be very glad of your energy state. :)

[bkthunder]

The main types of spark plug fouling are oil fouling and carbon fouling.

Oil fouling is given by the small amounts of oil that seep through the cylinders and can clog the spark plugs if not burnt off.

 

Carbon fouling is caused by carbon in the fuel not being burnt off and accumulating on the insulator. Because carbon is conductive, the current from the coil is dissipated through the carbon on the insulator and doesn't bridge the gap, in other words there's no spark.

 

Spark plug fouling is basically a matter of fuel not being properly burnt due to an imperfect fuel/air mixture, and that can happen for a number of reasons including, but not limited to, low RPM, running too cold, mixture too rich, retarded timing.

 

One of the misconceptions is you only get fouling at low rpm, but actually you can foul the plugs by keeping the throttle too low at high speed and letting the airflow run the engine. A good example would be reducing throttle in a long dive, or descending to pattern altitude at idle, trying to slow down. That would get the sparks fouled and make for more challenging energy and engine management.

[Yo-Yo]

The main types of spark plug fouling are oil fouling and carbon fouling.

Oil fouling is given by the small amounts of oil that seep through the cylinders and can clog the spark plugs if not burnt off.

 

Carbon fouling is caused by carbon in the fuel not being burnt off and accumulating on the insulator. Because carbon is conductive, the current from the coil is dissipated through the carbon on the insulator and doesn't bridge the gap, in other words there's no spark.

 

Spark plug fouling is basically a matter of fuel not being properly burnt due to an imperfect fuel/air mixture, and that can happen for a number of reasons including, but not limited to, low RPM, running too cold, mixture too rich, retarded timing.

 

One of the misconceptions is you only get fouling at low rpm, but actually you can foul the plugs by keeping the throttle too low at high speed and letting the airflow run the engine. A good example would be reducing throttle in a long dive, or descending to pattern altitude at idle, trying to slow down. That would get the sparks fouled and make for more challenging energy and engine management.

 

It's rather depends on spark plugs working temperature. Too low temperature causes fouling and too high - preignition and self-ignition. And the way we simulate it is to use heat balance rather than rpm only.