Patch road map ?

[jf1981]

Originally Posted by Sutts

I would have thought your boost setting was a more important factor in cooking the engine than your RPM. With a constant speed prop you could maintain 2800 RPM while using excessive boost - that would surely fry your engine. Would be good to know the full picture - boost / mixture settings and speed, oil and coolant temps during the climb.

That's what I'd expect however the boost is regulated and kept below 6 1/4. There should be no danger of continuously running at that boost if revs are kept below 2850 which shall be the max continuous revs.

That's about what you find for the Merlin II engine. I prefer to run at 2600 because the sound is more comfortable.

Danger on engine lifetime comes from overboost when it's available and max revs, however the engine should handle it, only resulting in shorter maintenance and ultimately lifetime, but that's currently beyond Cliffs of Dover.

[Sutts]

Originally Posted by jf1981

That's what I'd expect however the boost is regulated and kept below 6 1/4. There should be no danger of continuously running at that boost if revs are kept below 2850 which shall be the max continuous revs.

That's about what you find for the Merlin II engine. I prefer to run at 2600 because the sound is more comfortable.

Danger on engine lifetime comes from overboost when it's available and max revs, however the engine should handle it, only resulting in shorter maintenance and ultimately lifetime, but that's currently beyond Cliffs of Dover.

Yes, doesn't sound like you were abusing the engine. Perhaps the cooling model is at fault and the engine is simply running hotter than it would in reality at the climb power setting. In the game it only seems to take a few seconds of over temp to screw the engine up.

Perhaps next time you try it you could watch the oil and water temps carefully and record any excessive temps that occur during the climb. A recorded track would be even better.

Cheers

[IvanK]

"I've also learned that it should'nt be the case since they are normally auto rich and auto lean so lean shall work better in theory."

Not really Auto lean is really only of use for cruising and has Max boost limitations associated with its use.

Currently in game if run Boost cut out you need to push the mixture lever forward to AUTO lean to get smooth engine operation. This is of course totally wrong and should result in engine issues pretty darn quick.

SPIT MKII Boost limitation in Auto lean is +4/2650 100 Octane or 2.25/2650 at 87 Octane.

Spit MKI Boost Limitation in Auto Lean is +2.25/2600 87 Octane.

Unless you are really interested in best fuel consumption then Auto Rich is all you should really need.

[jf1981]

Originally Posted by IvanK

"I've also learned that it should'nt be the case [...] Unless you are really interested in best fuel consumption then Auto Rich is all you should really need.

I am indeed. When we do fly some historical battels, most of us are falling down due to lack of fuel or lack of lifting surfaces generally.

[FFCW_Urizen]

AFAIK jf, the Merlin can handle 6.25 lbs/3000rpm only for 30 mins, before issues occur. However, as it is now, you are lucky if you can go 2800rpms without cooking your engine and that is in level flight.

[FS~Phat]

Ive found if you apply a bit of common sense and watch your temperatures you can get by. Ive run with boostcut and water temp up to 120c and oil to 97c for about a couple minutes without failure but water needs to be mostly under 110c and oil 95c to avoid damage. With temps properly managed I have run boostcut continuously for 30mins without any noticeable damage.

[Redroach]

Though I am not really into in-depth-knowledge of engine limitations, I do agree that current performances are a bit shaky at best.
Before the current beta patch my guideline was "2600rpm with full boost (sans c/o) for continuous operation" (*) for both the SpitMkIa100oct and the Hurri100oct. But now, even that is no more guarantee... you really seem to be forced to tone it down to about 2400-2500rpm in order to maintain reasonable oil/cooling temperatures.

(*) The spit Mk I manual even says that somewhere, if I remember correctly - but the other limits, like the cut-out limit of 5 min. or the rpm limit of 3000 for i-dont-remember-how-long-exactly were always way off imo.

[jf1981]

Originally Posted by Sutts

Yes, doesn't sound like you were abusing the engine. Perhaps the cooling model is at fault and the engine is simply running hotter than it would in reality at the climb power setting. In the game it only seems to take a few seconds of over temp to screw the engine up.

Perhaps next time you try it you could watch the oil and water temps carefully and record any excessive temps that occur during the climb. A recorded track would be even better.

Cheers

I really think the real aircraft handles its nominal climb boost and revs up to the top, that is 2850 rpm 6 1/4 boost up to 30'000 ft, and we're still far from that.

Should be cross checked, but in my mind, it should handle that.

But I really think that's side effects from inadvertant engine and flight model changes. They are not documented anywhere that I know and one has to try to see what is working and what is not.
I used to read the historical manual, but what you find does'nt essentially apply to CoD.