Which Spit IX?

[Nashwan]

Which version of the Spit 9 do we have in AH, F, LF or HF? And which Merlin does it use? I haven't seen any offical anouncement on this, but then I hadn't even heard of AH when the Spit was introduced.
The reason I ask is because I was trying out the climb performance offline. Time to altitude seems a bit too fast for the basic 42 model, but way too slow for the HF and LF, or the later F models. It may well be that I got the parameters for the test wrong, so if somebody whith more experience has done this please post your results.


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Spit dweeb and proud of it.

[jmccaul]

I believe Pyro said it was a spit 9 F with merlin 61.

[Vermillion]

I thought it had the Merlin 66.

Definitely remember that it is suppose to be the 1944 version of the Spit IX.

Don't know about climb tests, but up until this latest revision it was about 10mph too fast at critical altitude, and the critical altitude was about 5,000 ft too high.

Speedwise it was performing like an HF unless its changed recently.

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Vermillion
**MOL**, Men of Leisure
Carpe Jugulum
"Real Men fly Radials, Nancy Boys fly Spitfires"

[[Sg]ShotGun]

if we r talking about the genuine mkix, then we got only 3 variants, the F  LF  HF.

the L had the 61 (1565hp) or 63 (1650hp), the LF had the 66 (1580hp) and the HF got the 70 at 1475hp.

[This message has been edited by [Sg]ShotGun (edited 04-30-2000).]

[Nashwan]

These are the figures I got for time to altitude, compared with the figures the A&AEE got during the war.
Alt...AH IX : 1942IX : HF IX : LF IX : 1944IX
4K.....1.07....1.10.......... ................0.50
6K. ...1.38...............1.24... ............1.15
10K....2.42...............2.2 5....2.15.....2.06
18K....4.58...............4.1 8................
20K....5.40....6.00.......... ...............4.30
30K....9.52...11.40.....8.05. ...8.40....8.17

My test was carried out by flying at sea level at 180mph then going full throttle and wep then engaging alt-x. The plane climbed at approx 170mph, which I believe is the correct climbing speed for the Spit. Full fuel and ammo were carried, but no drop tank.
Of course, due to the fuel modifier, the plane was a lot lighter in the latter stages of the climb than a real one would have been.
In the above chart the 1944 Spit IX is using 150 octane ful, which I understand was common by 1944.
The A&AEE results can be found at http://www.fourthfightergroup.com/eagles/spit9.html


[This message has been edited by Nashwan (edited 04-30-2000).]

[funked]

Vermillion a Spitfire LF Mk. IX that is 10 mph too fast at critical altitude and has a critical altitude 5,000 feet too high - Sounds so me like a Spitfire HF Mk. IX.

[funked]

Nashwan you might want to use M:SS for minutes and seconds.  In the USA we use the "." to denote decimals, so 0.50 means 1/2 a minute to us...



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Mike "FunkedUp" Waltz

Aces High Instructor Corps
S/L 308 (Polish) Squadron "City of Cracow" RAF
Northolt Wing (1st Polish Fighter Wing)

[juzz]

Aces High Spitfire Mk.IX top speeds:

260mph IAS and 420mph TAS at 28,000ft.
275mph IAS and 415mph TAS at 25,000ft.

Are those IAS/TAS relationships correct?

It's still too fast though.  

[funked]

Juzz that's pretty close to 415.5 @ 27,800 feet for the Mk. IX HF with Merlin 70.

I guess you can argue about the 4.5 mph but considering measurement error I'd say a 1% variation from the real plane is a pretty damned accurate flight model!  

[Nashwan]

Yes, it is mins:secs, sorry should have used the : to make it clear.
The speed figures make it sound like an HF, now if only we could have the climb rate to match.  

[Vermillion]

Heheh thats the point Funked, it definitely fly's like a HF, but Pyro said its suppose to be the mid alt variant ( F or LF ? I always get them confused)

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Vermillion
**MOL**, Men of Leisure
Carpe Jugulum
"Real Men fly Radials, Nancy Boys fly Spitfires"

[jmccaul]

OK a conclusive answer from PYRO

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The AH Spit is a F.IX with a Merlin 61.
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from http://bbs.hitechcreations.com/smf/Smileys/default/Forum1/HTML/001267.html

making it a '42 varient and i believe the worst performing spit 9.

Then again it may be overmodelled.  

[jmccaul]

How ever many times i say this people seem to firget and in a month when there is another spit thread somebody who doesn't like spits  will say yeah but ours is a 44 varient spit.

[funked]

Thx Jmccaul, I hadn't seen that one!

[juzz]

funked; if the AH Spitfire Mk IX was really performing like a HF.Mk IX it would climb alot faster than it does already.