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#3301879 - 05/23/11 09:05 PM Re: Altitude Climb [Re: Senseispcc]  
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ATAG_Snapper Offline
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Originally Posted By: senseispcc

This is the altitude I could reach with a Spitfire MKIIa;

(screengrab showing 27,400 ft)

I love this game even if it is far from a finished product.


Wow, that's two miles higher than my earlier attempt pre-beta patch! We're still 3K - 4K away from a realistic service ceiling (considering wear & tear on the average Spit engine) but getting there!


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#3301997 - 05/24/11 12:04 AM Re: Altitude Climb [Re: Senseispcc]  
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Tell Offline
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Not seeing your radiator (blue) indicator

#3302021 - 05/24/11 12:30 AM Re: Altitude Climb [Re: Tell]  
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FearlessFrog Offline
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Originally Posted By: Tell
Not seeing your radiator (blue) indicator


Tell makes a good point - this is with CEM on right?

#3302085 - 05/24/11 02:38 AM Re: Altitude Climb [Re: Freycinet]  
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Originally Posted By: Freycinet
How do I use this boost thing, can anybody explain it? - The why and how actually... smile


Its called the manifold pressure...get the a2a spitfire book and people please learn how to operate the CEM before declaring it "porked"...

Last edited by louisv; 05/24/11 02:39 AM.
#3302137 - 05/24/11 04:09 AM Re: Altitude Climb [Re: ATAG_Snapper]  
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Tell Offline
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I think we are at game engine limit as of latest patch.

#3302164 - 05/24/11 05:58 AM Re: Altitude Climb [Re: louisv]  
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DocW Offline
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Originally Posted By: louisv
Originally Posted By: Freycinet
How do I use this boost thing, can anybody explain it? - The why and how actually... smile


Its called the manifold pressure...get the a2a spitfire book and people please learn how to operate the CEM before declaring it "porked"...


Yeah Freyci, please stop yelling at us that the sim is porked ... biggrin

for your viewing pleasure, Frey, another hint on intake pressures (though a Merlin, not in an English plane, and not about boost):

Manifold pressure observations

#3302207 - 05/24/11 08:32 AM Re: Altitude Climb [Re: Tell]  
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Tiger27 Offline
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Originally Posted By: Tell
I think we are at game engine limit as of latest patch.


Tell, havent tried this so not sure what occurs at that height, but wouldnt the prop pitch be better in a coarser setting when up high, with the air being thinner also how is it if you close the radiator a little, or do you hit some sort of invicible ceiling either way, I may be way off as Im still getting my head around CEM and like Frey I dont know as yet how to use boost and to be honest Im not sure what the ceiling of a SpitIIa is, are we far off?


III/JG11_Tiger
#3302220 - 05/24/11 08:45 AM Re: Altitude Climb [Re: Tiger27]  
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DocW Offline
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They should make 30.000 ft, so I don't think we are too far off.
About the boost, with a Rotol constant speed prop, the engine was at constant 2850 or so rpm, so the boost pressure indicated the power applied.
- at least, this is my understanding.

Michael.

Data:
http://www.spitfireperformance.com/spitfire-II.html

Last edited by DocW; 05/24/11 09:01 AM.
#3302226 - 05/24/11 09:25 AM Re: Altitude Climb [Re: ATAG_Snapper]  
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ATAG_Bliss Offline
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Make a mission with an airstart of 10000 meters and see what happens when you spawn in a spit biggrin

#3302245 - 05/24/11 10:33 AM Re: Altitude Climb [Re: ATAG_Bliss]  
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Limit is same with air start. Radiator is open to keep water temp down. Note that I forgot to zero the altimeter at takeoff so start was actually 200ft at takeoff. In any case I think we are seeing a game engine limit.

Last edited by Tell; 05/24/11 10:48 AM.
#3302924 - 05/25/11 02:46 AM Re: Altitude Climb [Re: ATAG_Snapper]  
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Tiger27 Offline
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I made it to 26000ft without boost, prop pitch at 80%, that was pretty easy, the next 1000ft were the killer eventually made it to 27000, before I gave up.

The other thing that seriously needs looking at is after climbing to 27000 I then dove with prop pitch full coarse, throttled back to about 50% straight down to 8000ft with no damage to wings, ailerons etc, would have thought the pull out would have damaged something, although engine did die on the way down, maybe Im wrong and they were able to survive a dive and pull out like that?


III/JG11_Tiger
#3303054 - 05/25/11 10:01 AM Re: Altitude Climb [Re: ATAG_Snapper]  
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Trooper117 Offline
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Looking at the MkII manual it states that:
'Maximum diving speed is 450 mph, A.S.I.'

With a constant speed airscrew:
'At maximum rpm, 3,000, the throttle must be a 1/3 open.'
'The pitch control need not be brought back to reduce rpm, the range of pitch is enough to hold down the rpm at any airspeed.'

On climbing it states:
'The aeroplane may be climbed for periods of 30 mins at a boost pressure of +9 lb./sq.in. and 2,850 rpm. In this condition the best climbing speed is 160 mph. A.S.I. up to the rated altitude (13,000 ft.).'

For normal climbing:
'Ground level to 13,000 ft - 185 mph. A.S.I.'
15,000 ft - 180 mph A.S.I.
20,000 ft - 160 mph ''
25.000 ft - 140 mph ''
30,000 ft - 125 mph ''
35,000 ft - 110 mph ''

It also states:
'Watch the radiator and oil temperatures, and adjust as necessary.'

Max radiator temp 120'C
Max oil inlet temp 90'C

With other airscrews:

With the ROTOL 35º constant-speed airscrew, the R.P.M. will remain constant in the dive
within governor limits (1,700-3,600 R.P.M.). However with the WATTS OR WEYBRIDGE fixed-pitch or
de HAVILLAND TWO-POSITION airscrews, R.P.M. limits can be reached and exceeded rather quickly.

When the TWO-POSITION airscrew is installed, the plunger control must be set fully forward in the
COARSE position.
When the ROTOL 35º CONSTANT-SPEED airscrew is installed the airscrew control
should be set back in the POSITIVE COARSE position before starting the dive to prevent the
airscrew from jamming in fine pitch.
The minimum R.P.M. permissible at maximum Boost is:
Mk I - 2080 R.P.M.
Mk II - 2270 R.P.M.


All intersting stuff smile

Last edited by TROOPER117; 05/25/11 02:44 PM.
#3306631 - 05/29/11 10:12 PM Re: Altitude Climb [Re: ATAG_Snapper]  
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Tell Offline
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This is from A2A Spitfire 1A FSX addon with Accusim. 32,000 ft. without issue.

Last edited by Tell; 05/30/11 12:00 AM.
#3306740 - 05/30/11 01:10 AM Re: Altitude Climb [Re: Tell]  
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Tiger27 Offline
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Originally Posted By: Tell
This is from A2A Spitfire 1A FSX addon with Accusim. 32,000 ft. without issue.


I notice that the fuel tanks are empty on the A2A Spitfire, have we tried to get higher in CoD with a near empty tank?


III/JG11_Tiger
#3306750 - 05/30/11 01:32 AM Re: Altitude Climb [Re: Tiger27]  
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Tell Offline
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There is a button at each gauge that must be depressed to show fuel level. At point in flight depicted the top tank was already empty and lower tank was getting low so I was searching for a landing field. Luckily I spotted Palm Springs and was able to land without incident. In hangar mechanic declared the AC to be in good condition, no damage. Use of oxygen mask is mandatory of course and O2 gauge needs to be monitored.

Last edited by Tell; 05/30/11 01:33 AM.
#3307384 - 05/31/11 12:36 AM Re: Altitude Climb [Re: Tell]  
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Tiger27 Offline
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Perth, Western Australia
Originally Posted By: Tell
There is a button at each gauge that must be depressed to show fuel level. At point in flight depicted the top tank was already empty and lower tank was getting low so I was searching for a landing field. Luckily I spotted Palm Springs and was able to land without incident. In hangar mechanic declared the AC to be in good condition, no damage. Use of oxygen mask is mandatory of course and O2 gauge needs to be monitored.


Cool, I do recall seeing that now that you mention it in the A2A video.


III/JG11_Tiger
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