Blenheim operating limits and checklists

[Mechanist]

Originally Posted by Blackdog_kt

On the other hand some people say that while the animation is that of a two-stage prop, it actually works like a fully variable one. I think we need to do some more testing to clarify this.

Allready done:

Prop pitch seems to be two stage in the 3D modell. (on 0 pitch input it turns right to a more featherd position, on anything else than 0 it turns left to its takeoff position. You can observe it when the engines are stoped) However, it have a full effect on rpm in different positions (not just two stages) as I measured:

Throttle 75 %
IAS 200-210 mhp
Height 8000ft
Radiator 100%
Carburetor heat 100%
Pitch % / RPM
100 / 2660
75 / 2520
50 / 2320
25 / 2120
0 / 1760

My findings about the carburetor heat

Carburetor heat seems to work inversely. In 100% you'll get less engine temperature then in 0%

Throttle 50 %
Pitch 75%
IAS: 150-160 mph
Height: 8000 ft
Radiator 100 %
Carburetor heat % / Engine temperature °C / RPM
100 / 201 / 2260
75 / 203 / 2290
50 / 208 / 2340
25 / 221 / 2380
0 / 233 / 2480

Also the carburetor heat controll lever labeld as "AIR INTAKE SHUTTER" (Don't really know how it suppose to work on this airplane)

Also mixture doesen't work at all. Just try a mission with mixture at 0%, then refly the same mission with 100% an you won't notice any difference at all, regardless the altitude.

[Blackdog_kt]

Interesting findings, maybe we can use a bit reduced pitch to prevent overheating then until they correct the propellers and the airflow/overheat modeling.

As for the mixture, it's semi-automatic (just like in the Spitfire) and that's why we can't see a difference: 0%-50% mixture is auto-rich, 51%-100% mixture is auto-lean. It will automatically maintain either of the two ratios depending on where it's set at, so moving it back and forth doesn't produce any rough running of the engines.

I know you will wonder why does the lever move gradually, instead of "snapping" into the two extreme positions like in the Spitfire, but for some weird reason it was like this in the real aircraft: full range of motion for the levers but only two effective settings.

[Vengeanze]

So in short mixture is inverted and carbheat is inverted and the animation of the prop is that of a two-stage prop but works like a fully variable one.

Did they get anything right?

[phoenix1963]

Originally Posted by Vengeanze

So in short mixture is inverted and carbheat is inverted and the animation of the prop is that of a two-stage prop but works like a fully variable one.

Did they get anything right?

No, the % shows the position of the lever not the mixture.
Carbheat works fine for me.

Has anyone climbed over 11k ft without engine shake?

56RAF_phoenix