Spitfire RPM's

[icuucme37]

When flying the Spitfire without CEM on you can't get full RPM's out of the engine. The automatic engine controls pulls the prop pitch back to 0% and never mover it up to 100% so you can't get max RPM and speed from the engine.

[Viper2000]

Originally Posted by icuucme37

When flying the Spitfire without CEM on you can't get full RPM's out of the engine. The automatic engine controls pulls the prop pitch back to 0% and never mover it up to 100% so you can't get max RPM and speed from the engine.

That's what it's supposed to do.

Actually you'll get pretty much full rpm if you climb to operational altitude (ie about 16000-18000 feet).

The Spitfire was not designed to fight at sea level.

[Peril]

Originally Posted by Viper2000

That's what it's supposed to do.

Actually you'll get pretty much full rpm if you climb to operational altitude (ie about 16000-18000 feet).

The Spitfire was not designed to fight at sea level.

Viper, do you have any tested data we can see to verify the rpm v alt curve? This data would add support to any CoD FMs accuracy claims, be good to see it's close to the mark. I've not worked with 'fixed pitch' props in TW FMs, so not much data or first hand experience with simulated fixed props here.

[Viper2000]

Originally Posted by Peril

Viper, do you have any tested data we can see to verify the rpm v alt curve? This data would add support to any CoD FMs accuracy claims, be good to see it's close to the mark. I've not worked with 'fixed pitch' props in TW FMs, so not much data or first hand experience with simulated fixed props here.

Nothing beyond that available to everybody else online:

http://www.wwiiaircraftperformance.o...ane/l1547.html

And yes, I know this is data for a Hurricane. You'd get the same sort of results with a Spitfire, but unfortunately there doesn't seem to be good data immediately available; here is all the Spitfire I stuff:

http://www.spitfireperformance.com/spitfire-I.html

[Peril]

Thanks, that's indeed helpful.

I note that the lowest rpm shown is around 2650 rpm if you extrapolate the graph to SL. This is obviously the high pitch setting, I wonder how much rpm should we see from low pitch at SL? The planes in game currently show a lot lower rpm in fixed high pitch, for what ever reason? The issue that results is that hp is linked to rpm and thus the planes in game with fixed props may be under represented in this area if rpm is low.

Virtual props in Targetware were difficult animals to get functioning realistically, I imagine it is the same here in IL2 FMs.

Thanks again for the data.

[icuucme37]

It don't matter what altitude your at in the Spitfire with out CEM on, you can't get above 21-2200 RPM's.

So I know this is not right. You hit the auto-pilot and it turn 100% pitch and 2800-3100 rpms, airspeed picks up. turn off AP and watch airspeed and PRM's fall like a rock.