CEM Hurricane Vibration and Smoke

[609_Huetz]

Apparently, this is buggy to some point.

I just did another quick test, this time in the 109. At some point (~3000 meters) the plane started to vibrate (all temperatures in manual specified range) and even spat out a few clouds of black smoke.

Also (same as on the Hurricane), when the engine was pulled back to idle, the vibration would stop.

Kept climbing to around 6000 meters where the vibration got so bad that I decided I had enough.

Went into a prolonged dive, always keeping the temperatures at the same level. As soon as I went below ~3000 meters the vibration was gone, no more smoke or anything. Running smooth up (and quite a bit beyond) maximum performance specified in the manual.

Also, in neither of the two tests there was damage visible on the post-flight screen.

Test conducetd on the cross-boarders flight and on freeflight france.

[Chill31]

Contrails at 22000 feet? Sounds low to me.

Are you leaning the mixture enough at 10000 ft? (I dont have CoD yet, soon though)

[Eklund89]

Supercharger? Is there any on the hurri?

[609_Huetz]

Yep mixture is set to auto-weak (the lowest possible setting even) and everything is looking fine as far as the setup goes. Temperatures are well in range and as I said, you don't get a damage result from flying like that. It also happens on the 109 that auto adjusts the mixture inflight anyways.

Doubled checked with a squadmate who is also getting the same.

Apparently the tolerances for the engine cutout are set to low on the Merlin engine, forcing a cutout on even the slightest 0.x G manouvers, but that only seems to be part of the problem.

As far as I know, the Mk. I was equiped with a single speed supercharger, so nothing to adjust there. Planes fitted with the newer Mk.XX Merlin engine were designated Hurricane Mk.IIs, along with changes/variations to the armament and the wing.

With the contrails I was referring to no contrails at all (at least not that I noticed any) up to altitudes of 27.8 k feet, the highest I got so far in the Hurri. That is by the way quite a bit higher the auto managed Hurricane likes to get (CEM off) comfortably.

[justme262]

I have been unable to fly Hurricanes Spitfires or Messerschmidt above 21000ft.

The first thing is the hurricane mixture control lever. In real life it is rich aft lean forward. against the convention. If you look closely you can see a little sign in the cockpit...rich -> aft.

In game the DH hurricane is lean aft and rich forward and the rotol hurricane is rich aft lean forward...confusing! The throttle is supposed to push the mixture to rich when you close the throttle but this is buggy in both hurri.

Apart from that issue, the auto rich setting should lean the mixture at altitude without the pilot doing anything. But the engine vibrates and blows smoke like it's running too rich.
I wonder if this is supposed to correlate with Full Throttle Height. About 18000ft or so in a hurricane. So maybe we have to progressively reduce the throttle the higher we go over FTH. Even doing that there is no way I can approach 30000ft which a hurricane mk1 could supposedly do.
But my understanding of full throttle height is sketchy to say the lest.

The 109 has auto mixutre so there is nothing you can do except lowering throttle and/or prop pitch. but you have to lower them to idle to stop the vibration...

I love the complex engine management but it maybe has a few bugs to iron out yet...
The first time I flew a ju87 across the channel bombed a Dover radar( missed actually) and flew home with out breaking my engine was very satisfying indeed!

[BlackbusheFlyer]

Yes also can confirm what the OP reports. It appears CEM is very buggy at the moment with mixture/auto-mixture hopefully it will be addressed in tomorrow's patch.