Bodenplatte Spitfire IX notes

[LUZITANO]

I did some tests on Spitfire, here the results

 

His rate of climb is good, totally changing the fighting dynamics that had hitherto been focused on the Soviet front

The standard engine can deliver excellent performance up to 3-6k altitude. But it is also possible to install in the Spitfire a Merlin 70 engine that provides power for high altitudes. Or if you prefer the player can cut the wings of the Spitfire to gain more speed at low altitudes

 

We have the LF IXe Merlin 66 25lb18lb version. On summer maps using automatic radiator, I reached the speed of 330 mph (528km / h) at sea level (I dont know why but 355mph in winter maps)

 

It dives to the top speed of 900km/h, then it begins to disintegrate. Up to 320 mph / h it is possible to make sharp turns. At 330 mph the wings break while trying to make a sharp turn

 

Personally I think it's going to be a deadly plane, the Spitfire IX  can compete on equal footing with the 109G-14. The German plane I believe to be dangerous is the 190D-9 and the 109K4, but without a doubt the SpitIX can compete with all the propeller airplanes of the end of the war

 

Edited May 26, 2018 by LUZITANO

[=362nd_FS=RoflSeal]

We have 18lb boost for Merlin 66

[CisTer-dB-]

36 minutes ago, LUZITANO said:

We have the LF IXe Merlin 66 25lb version.

No we don't

 

Here also we've reply to your post

 

Edited May 25, 2018 by ATAG_dB

[Fritz_X]

Is there a reason why you keep (falsly) claiming that we got the 25lb boost?

 

You already said this in two other threads, being corrected by other users both times. Third time's a charm, maybe?

[LUZITANO]

4 hours ago, RoflSeal said:

We have 18lb boost for Merlin 66

Hello. I'm reading the messages now

Strange, I tested the plane and it did 355 mph at sea level. I figured it's the 25lb version

Does anyone have a link to the official information?

 

[Talon_]

Why don't you just look at the boost gauge in the cockpit, Luzitano?

[LUZITANO]

2 minutes ago, Talon_ said:

Why don't you just look at the boost gauge in the cockpit, Luzitano?

no. in fact I do not understand this technical part. I'll try to inform myself

6 minutes ago, Talon_ said:

Why don't you just look at the boost gauge in the cockpit, Luzitano?

Wow ... now I went to find this watch. Really an 18lb, thank you.

Strange, it does a higher speed on winter maps

 

I'll edit the post

[Talon_]

Here you go mate - "Boost" in a Spitfire is equivalent to inches of mercury in a US plane or ATA in a German one. It's effectively a measurement of manifold pressure.

 

[LUZITANO]

1 minute ago, Talon_ said:

Here you go mate - "Boost" in a Spitfire is equivalent to inches of mercury in a US plane or ATA in a German one. It's effectively a measurement of manifold pressure.

 

thank you. I checked after you asked me about this

[-=PHX=-SuperEtendard]

27 minutes ago, LUZITANO said:

Strange, it does a higher speed on winter maps

 

At winter the indicated air speed is higher than the true air speed, so you will be overestimating it.

[LUZITANO]

31 minutes ago, -=PHX=-SuperEtendard said:

 

At winter the indicated air speed is higher than the true air speed, so you will be overestimating it.

I made a technical mistake. I edited the post, now with the correct Spitfire at 18lb (not a 25lb...). In the winter map that I made a test the speed was very high, so I confused the models
I did not know that there was such a difference in the speeds with the winter weather...

[-=PHX=-SuperEtendard]

Yeah for correct speed measurements you have to use Autumn map ?

[angus26]

3 hours ago, -=PHX=-SuperEtendard said:

Yeah for correct speed measurements you have to use Autumn map ?

Why is this? Excuse my question, but is it related to air pressure/ air temp?

[-=PHX=-SuperEtendard]

11 minutes ago, angus26 said:

Why is this? Excuse my question, but is it related to air pressure/ air temp?

Yep, in game Autumn maps have 15ºC temperature and 1013.25 hPa pressure at sea level which are the standard conditions to test the flying characteristics of the planes. In different conditions at sea level you will need to make corrections based in temperature and pressure.

Edited May 26, 2018 by -=PHX=-SuperEtendard

[angus26]

2 hours ago, -=PHX=-SuperEtendard said:

Yep, in game Autumn maps have 15ºC temperature and 1013.25 hPa pressure at sea level which are the standard conditions to test the flying characteristics of the planes. In different conditions at sea level you will need to make corrections based in temperature and pressure.

Thanks! That’s really cool they have that!

Edited May 26, 2018 by angus26

[Barnacles]

For dive speed I got to around 820kmh IAS before bits started to fall off (V bfo). Interestingly the Spit V is now also experiencing V bfo at 820kmh IAS rather than 750kmh which I seem to remember was the case before the update.

[CisTer-dB-]

42 minutes ago, 71st_AH_Barnacles said:

V bfo

Can you define this? 

 

I got it .Bit Start to Fall Off ? I'm gonna use that lol

 

42 minutes ago, 71st_AH_Barnacles said:

For dive speed I got to around 820kmh IAS before bits started to fall off (V bfo). Interestingly the Spit V is now also experiencing V bfo at 820kmh IAS rather than 750kmh which I seem to remember was the case before the update.

For the sake of the argument I will speak in Mph since the Spit is imperial.

 

The VNE is 450. My test give a brake up at around 482 to 484 bellow 10000 feet, that make it bellow the 10% design safety margin that is usually set during certification. In fact the brake up point should be more around 495 MPH. In other words the 750 KM/H (466 mph)for any damage to occur is a bit low 

Edited May 26, 2018 by ATAG_dB

[Barnacles]

54 minutes ago, ATAG_dB said:

In other words the 750 KM/H (466 mph)for any damage to occur is a bit low 

It is and the Spit V certainly used to get damage at around 750 Kmh, but since the update, it experiences damage at  around 820 kmh (510mph) just like the Spit IX in game.

 

I did a couple of runs at this but maybe i got lucky?

 

I also used the 'instrument panel' readout of IAS.

 

Edited May 26, 2018 by 71st_AH_Barnacles

[CisTer-dB-]

I don't doubt you mon ami. In all case now, it's closer then what it should be. 

[Lusekofte]

Is the wing clipped Spit easier to recover from a spin ? I tested out this wonderful bird in Kuban Summer map. Tried to provoke a spin and recovered a mega stall pretty easy at low level. The  stall and spinn was very convincing, so was the recovery. I do not claim anything wrong, just found it peculiar I manage to recover

[Venturi]

Eric Brown gave a interview after the war in which he stated that the Spitfire had reached some of the highest mach numbers of any aircraft then known - close to mach 0.97 IIRC. Of course it twisted and warped the airframe.

Edited May 26, 2018 by Venturi

[Finkeren]

1 hour ago, Venturi said:

Eric Brown gave a interview after the war in which he stated that the Spitfire had reached some of the highest mach numbers of any aircraft then known - close to mach 0.97 IIRC. Of course it twisted and warped the airframe.

 

And that was a special test aircraft with a strengthened structure.

[MiloMorai]

It was?

[Field-Ops]

Anyone had an issue where switching to manual water radiator just gradually adjusts itself to 100% and you are unable to stop it or adjust it yourself?

[LukeFF]

4 minutes ago, Field-Ops said:

Anyone had an issue where switching to manual water radiator just gradually adjusts itself to 100% and you are unable to stop it or adjust it yourself?

 

That's by design.

[Field-Ops]

Thats interesting, is there no way to close them youself then?

[LukeFF]

54 minutes ago, Field-Ops said:

Thats interesting, is there no way to close them youself then?

 

You''ll have to use the command again, just like in the Bf 109 F-2.

[HBPencil]

12 hours ago, Venturi said:

Eric Brown gave a interview after the war in which he stated that the Spitfire had reached some of the highest mach numbers of any aircraft then known - close to mach 0.97 IIRC. Of course it twisted and warped the airframe.

 

11 hours ago, Finkeren said:

 

And that was a special test aircraft with a strengthened structure.

According to Alfred Price in his The Spitfire Story, the fastest official speed was Mach 0.89 set by a PR.XI in 1944, the airframe was standard (another book says the prop was modified to allow for a coarser pitch). Just before the pilot was going to ease out of the dive the reduction gear failed, it and the prop came clean off, an engine bearer buckled and a connecting rod forced its way out of the crank case.
Unofficially, a PR.XIX based out of Hong Kong in 1952 might have reached 0.94 and a top speed of 690mph when it inadvertently dived from 51,550ft.

[unreasonable]

10 hours ago, LukeFF said:

 

You''ll have to use the command again, just like in the Bf 109 F-2.

 

One of us must be missing something: I cannot find any manual radiator control, either in the manual or the cockpit. I do not think there is such an option in the real plane.

[JtD]

There's a pushbutton on the left side of the cockpit, so the pilot can test the radiator flap actuation mechanism on the ground prior to take off. I don't think it's a switch, so for proper simulation you'd need to keep the key pressed, and for as long as you do, the radiator flap opens. It has no purpose in flight.

[Ehret]

32 minutes ago, unreasonable said:

 

One of us must be missing something: I cannot find any manual radiator control, either in the manual or the cockpit. I do not think there is such an option in the real plane.

 

You can switch to the "manual" which opens rads 100% or have automatic. The former option is for emergencies only when the auto stopped working for some reasons.

 

Edited May 27, 2018 by Ehret

[Eicio]

17 hours ago, Venturi said:

Eric Brown gave a interview after the war in which he stated that the Spitfire had reached some of the highest mach numbers of any aircraft then known - close to mach 0.97 IIRC. Of course it twisted and warped the airframe.

 

I remember reading memories of a spitfire pilot who saw one friend of him chase a diving 109 and the messerchmidt disintegrated itself while the spitfire was good. 

 

The spitfire was definitltly a sturdy little plane, don't ask me why though I believe that some dark magic was involved in the creation of this plane...

[unreasonable]

52 minutes ago, Ehret said:

 

You can switch to the "manual" which opens rads 100% or have automatic. The former option is for emergencies only when the auto stopped working for some reasons.

 

 

OK I have the controls understood now: a LCtlW toggles between auto and fully open.

 

Not sure where that fully open part came from - no mention of it in the PN at all. Unless it is a possible (mis?)interpretation of the ground test switch. Hence my confusion after reading earlier comments.

 

No matter - I shall just fly auto. Thanks chaps!

[EAF19_Marsh]

Quote

V bfo

 

Genius ?

[Venturi]

18 hours ago, HBPencil said:

 

According to Alfred Price in his The Spitfire Story, the fastest official speed was Mach 0.89 set by a PR.XI in 1944, the airframe was standard (another book says the prop was modified to allow for a coarser pitch). Just before the pilot was going to ease out of the dive the reduction gear failed, it and the prop came clean off, an engine bearer buckled and a connecting rod forced its way out of the crank case.
Unofficially, a PR.XIX based out of Hong Kong in 1952 might have reached 0.94 and a top speed of 690mph when it inadvertently dived from 51,550ft.

 

 

Eric Brown:

( Mach 0.94-0.96)

 

https://soundcloud.com/aerosociety-podcast/the-capt-e-brown-interview

Edited May 28, 2018 by Venturi

[LukeFF]

14 hours ago, unreasonable said:

Not sure where that fully open part came from - no mention of it in the PN at all. Unless it is a possible (mis?)interpretation of the ground test switch. Hence my confusion after reading earlier comments.

 

It is a ground test switch, yes (item #41 in the cockpit images found in the pilot's notes).

[JtD]

It's still not a switch, but a pushbutton.

[unreasonable]

3 hours ago, JtD said:

It's still not a switch, but a pushbutton.

 

Ie it should not be there as an option for full radiators open in flight, IMHO.  Although I doubt that it will affect anyone in sim-flight, except perhaps to confuse them.

 

What should be there is the interlinkage of boost and rpm control on one lever - by BoBop this would have been by far the most common configuration.

[Herne]

On 5/26/2018 at 9:54 PM, Finkeren said:

 

And that was a special test aircraft with a strengthened structure.

 

I read somewhere that the spitfire had the better compressability value of any piston engine aircraft which was why it was used for mach testing. let me see if i can find it . . . .

https://en.wikipedia.org/wiki/Supermarine_Spitfire#Speed_and_altitude_records

 

There was another source which i'm struggling to find right now. Will link it if I find it

Edited May 29, 2018 by =FEW=Herne

[ZachariasX]

12 minutes ago, =FEW=Herne said:

I read somewhere that the spitfire had the better compressability value of any piston engine aircraft which was why it was used for mach testing.

The Spit has very thin wing profiles that give it a high critacal Mach. Plus elevators are light, so you can hold the aircraft longer than others.

 

On top of that, the Spit is built in a very solid way, keeping Vbfo very high and you can go fast with a lot of confidence.

 

The Tempest was almost as good at critical Mach, but you can't really go high with it for extended dives. And most imortantly, there were few Tempests compared to ubiquitous Spitfires. So if you ever felt compelled trashing an aircraft you could help yourself "with one of the Spits".