How to get max. perfomrnance with CEM in Spit/Hurri ?

[oho]

Hi all,
how do you get best performance in the hurricane rotel and Spit Ia with flexible prop pitch?
With what RPM of the rotor do I get (with full throttle) the best performance together with what speed? Or is there fix best performance rotor speed, so that i can just adjust the rotor-blade angles and try to hit this rpm?
I generally fly with full radiator open, because I it the motor goes bad too fast for me, or is there a not risky setting for the radiator?
Mixture is always rich to get best performance - is that correct?

[*Buzzsaw*]

Hi all,
how do you get best performance in the hurricane rotel and Spit Ia with flexible prop pitch?
With what RPM of the rotor do I get (with full throttle) the best performance together with what speed? Or is there fix best performance rotor speed, so that i can just adjust the rotor-blade angles and try to hit this rpm?
I generally fly with full radiator open, because I it the motor goes bad too fast for me, or is there a not risky setting for the radiator?
Mixture is always rich to get best performance - is that correct?

It depends what aircraft and what altitude you are at.

It is much more difficult to keep the engines of the British planes cool at higher altitude. Yes, I know, you are scratching your head and wondering, this is not logical, it's 30 degrees colder up at 20,000 ft, but that's the way the game works.

For the Spitfire IA 100 octane, you can run 2800 rpm and +6 boost full rad open at 1000 ft for a good 15 minutes or more, as was historical. But try that at 10,000 ft and you'll get backfiring and engine misses, and as well, you engine will overheat. Totally ahistorical and inaccurate, but that's the game.

At lower altitudes you can run approx. 1/2 radiator opening, and get sufficient cooling at less than full rpm, but up high, you better open your rad full if you are running any kind of heavy boost.

It is a matter of learning the planes, learning what they will tolerate, and going from there. The British are basically pooched at alts over 10,000 ft, even their best high alt planes are not very good.

[oho]

so 2800 is the best RPM setting or?

[Winger]

It depends what aircraft and what altitude you are at.

It is much more difficult to keep the engines of the British planes cool at higher altitude. Yes, I know, you are scratching your head and wondering, this is not logical, it's 30 degrees colder up at 20,000 ft, but that's the way the game works.

For the Spitfire IA 100 octane, you can run 2800 rpm and +6 boost full rad open at 1000 ft for a good 15 minutes or more, as was historical. But try that at 10,000 ft and you'll get backfiring and engine misses, and as well, you engine will overheat. Totally ahistorical and inaccurate, but that's the game.

At lower altitudes you can run approx. 1/2 radiator opening, and get sufficient cooling at less than full rpm, but up high, you better open your rad full if you are running any kind of heavy boost.

It is a matter of learning the planes, learning what they will tolerate, and going from there. The British are basically pooched at alts over 10,000 ft, even their best high alt planes are not very good.

Flying higher than any german scout and still pooched. Yes. ROFL

[Continu0]

so 2800 is the best RPM setting or?


For Crusing, you should use something between 2500 and 2600...

[ATAG_Snapper]

so 2800 is the best RPM setting or?

Add this to Buzzsaw's excellent advice above:


http://theairtacticalassaultgroup.com/forum/showthread.php?2292-Dealing-with-the-Merlin-Rumbles

[macro]

To get max speed out of 100oct hurri i do this:

2800 rpm full throttle rad50% until 200+mph (also for climbing check temps)

Then close rad 35% drop rpm to 2600 still full throttle

When stall fighting 109 at slow speed i use 3000rpm and control temps by rad and throttle.

I love being at work on a saterday

[*Buzzsaw*]

Add this to Buzzsaw's excellent advice above:


http://theairtacticalassaultgroup.com/forum/showthread.php?2292-Dealing-with-the-Merlin-Rumbles

Salute

Ivan's suggestions are the best comprehensive outline of how to use the aircraft.

I will add an addendum to Ivan's notes for the Spit IIA:

It is not all clear sailing.

At higher altitudes, you cannot run full boost without an issue, and do not expect that you can run 105 degrees C oil temperatures without engine damage.

Over 10,000 ft you need to keep your oil temperatures to 95 C or below, I realize that is tough to do, but if you let it creep over that, the chances of catastrophic damage are inevitable. Yes, this is a lower temp than what the Merlin XII guidelines allowed, but that's the inaccuracies of the game.

Also, running full throttle/boost over 15,000, even though your boost meter is not showing the engine attaining a very high number, is going to kill your engine if you do it for any more than a 10-15 seconds at a time. Heat rises extremely fast.

For the Spit IIA, practical settings which you can leave the engine at when continuously climbing and keep it quite cool.

0-5000 ft: 2800 rpm and +6 boost full rad, climb speed 160 mph gives approx. 85 C

5-6000 ft: 2800 rpm and +4 boost full rad, climb speed 160 mph gives approx. 87 C

10-15,000 ft 2700 rpm and +3 boost full rad, climb speed 150 mph gives approx. 90 C

15-20,000 ft 2700 rpm and +1-2 boost full rad, climb speed 150 mph gives approx. 93 C

At higher alts, this means you are climbing quite slowly, but gives you the reserve of temperature you need if you get into a fight.

Once you level out, try to reduce the rpms and boost as much as possible at high alt, to drop the temps to 90 C, it's tough to get it below that. It's also possible to reduce rad opening to 50% or below, depending on the altitude you are at, below 10,000 ft, at lower rpm's and boost, you can close the rad down quite a bit to increase cruising speed and still keep your temps around 85 C.

Once you get into combat, you can exceed the above guidelines for rpm and boost, especially if you are diving, going 3000 rpm and +9 boost below 10,000 ft is fine, I tend to go no higher than 2800 over 10,000, but whatever you do, you need to keep a close eye on the gauges, beware of the oil temperatures going over 95 C, especially up high, the engine seems to tolerate higher temps better down low. And stay away from full throttle/boost over 15,000 unless its an emergency and keep use to short periods.