Author Topic: Spit 5  (Read 13306 times)

Offline Angus

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« Reply #150 on: August 13, 2004, 06:34:26 AM »
Are the tactical trials (190 vs P47) on this thread?
I'd love to get my hands on them
Yes the Mk VIII was a Merlin powered one, somewhat more developed than the IX (Stiffer wing, better roll) and it had sub-variants depending for alt work. It was also tropically equipped, hence it was mostly sent to the med or mid east.
Some saw service in the Italian campaign in 1943.
Probably the finest there was of the Merlin powered series. I don't know if they boosted it to 25 though.
Performance is just a shade inferior to the XIV. i.e. 5000 feet initial climb, good roll, high top speed, and it was still lighter than the Griffon series, so basically it turned very well.

Oh, BTW, Crumpp, do you have any climb data for the 190?
And secondly, do you have any Zoom data, i.e. how high does the zoom take you from a given speed (say 350 mph) to another given speed (say 160) ???
It was very interesting to carry out the flight trials at Rechlin with the Spitfire and the Hurricane. Both types are very simple to fly compared to our aircraft, and childishly easy to take-off and land. (Werner Mölders)

Offline gripen

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« Reply #151 on: August 13, 2004, 09:50:37 AM »
Quote
Originally posted by Crumpp
Well running your numbers for the FW-190 at 300Km through the downwash formula matches the computer similation almost exactly.


Cl (your calculation run through downwash effect) = .1296
Cl (as computed by the computer simulation) = .1295

This is for NACA 23009 at 0 degrees and 300km.


As usual Crumpp has no idea what he is doing, the Fw 190 can't fly 300km/h near sea level with AoA of 0 degrees.

First it should be noted that the profiles of the Fw 190 were NACA 23009 in the tip and the 23015 in the root, therefore the profile to use for analysis is 23012.

In the level flight 300 km/h near sea level, a 3850kg Fw 190 required Cl value 0,483636703 to fly (this is true and exact Cl). With the Panel code solver we can reach about same value by AoA of about 3 degrees and making downwash correction with aspect ratio 6,02.

gripen

Offline Crumpp

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« Reply #152 on: August 13, 2004, 10:09:18 AM »
Quote
As usual Crumpp has no idea what he is doing, the Fw 190 can't fly 300km/h near sea level with AoA of 0 degrees.


That's not what the performance graphs say.  I think your full of it.  Your simply trying to throw up smoke screen.

I did not know that about using NACA 23012.  I will run it through.  The Cl at the root was larger and that may account for the slight difference in values.


Angus,

The speed and climb graphs for the FW-190 are here:

http://www.terra.es/personal2/matias.s/fw190.htm

I have on for the FW-190A3 which I will email you.

Here is the tactical trials between an FW-190, Spitfire, and P47C/D4:

http://prodocs.netfirms.com/

I thought the tactical trials for the FW-190 vs Hellcat, Corsair were on there.  They are not.  I will send you a copy.

Here is what the NASA Aeronautical Engineer says about the lift equation:
------------------------------------------------------------------------------------
Hey XXXX,

The lift coefficient equation (and the whole idea of lift coefficients)
works for both 2D and 3D. The idea was developed many years ago .. before the Wright brothers. In fact, lift coefficients were defined a little bit differently in the days of the Wright brothers than they are today:
http://wright.nasa.gov/airplane/liftold.html
http://wright.nasa.gov/airplane/lifteq.html

but the idea is the same: we relate the lift force to some other known or measurable force, with the lift coefficient just being a factor .. a ratio ..between the lift and some known or measurable force. In the old days, before computers, people would measure the lift of an object .. and knowing the reference force, would generate tables or graphs of lift coefficients for all kinds of shapes, sizes, designs .. etc. The measurements were made on
models in wind tunnels .. and then applied to full scale airplane designs.
As computers came along, we figured out how to calculate the flow around a shape to get the lift coefficient. It's obviously easier to calculate a 2D shape than a 3D shape .. but the idea works for either one. Now, equally obvious .. the value of the lift coefficient for a 2D shape is different
than the value for a 3D wing. So an engineer has to be very careful when using lift coefficients. You have to find out how the particular value was generated (2D or 3D model) .. and there some other aerodynamics effects (like boundary layers and shock waves) which can effect the value as well. You can only apply the lift coefficient to a real case which is similar to how the original model was tested. Check out:
http://www.grc.nasa.gov/WWW/K-12/airplane/airsim.html
for some more details.

Tom

Offline Crumpp

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« Reply #153 on: August 13, 2004, 12:21:47 PM »
Gripen,

Quote
near sea level with AoA of 0 degrees.


I would be surprised to see any fighter in WWII that could hold an AoA at 0 degrees at that speed.
Point is the Cl were calculated under the same conditions.
0 degree AoA
300 km/h airspeed

Read above what a real aeronautical engineer has to say about the "Lift Co-efficient equation".


And compare it to your comments:

Quote
Gripen Says:
Well, as usual Crumpp has no clue what he is talking about.  


Quote
Gripen Says:
Note that the result of the formula is Cl (not Clo) ie this formula gives true lift coefficient. If a plane can fly at certain speed at certain altitude and it's weight and wing area is known, then this formula gives true Cl which includes all factors.


Well the Real Engineer says the equation can be used for both 2D and 3D data.  And it DOES NOT factor all things into it.  
Got anymore snippets of disinformation?

It's ok, Gripen.  You're correct about 50 percent of the time.  About the same as the rest of us.

Crumpp

Offline gripen

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« Reply #154 on: August 13, 2004, 02:04:41 PM »
Well, it's very simple:

Using the Cl formula it's easy to determine that the 3850kg plane with a 18,3m2 wing needs a lift coefficient 0,483636703 to fly level 300km/h at near sea level. There is no other results despite what ever is the aspect ratio or the wing profile.

Certainly whole thing can be calculated backwards. As an example we can use Crumpp's values on  the NACA 23009.

The Panel Code solver gives the Clo 0,1295 for the NACA 23009 at zero degrees AoA. Next we calculate the Cl for the the wing with the aspect ratio 6,02 with downwash formula and the result is 0,12862. Now we can simply use lift formula:

L = .5 * Cl * r * V^2 * A

Which results that with Crumpp's parameters the plane produces about 5022,14 N of lift which means that weight of the plane should be about 512 kg to do level flight at 300 km/h at near sea level.

gripen

Offline Crumpp

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« Reply #155 on: August 13, 2004, 03:01:37 PM »
:(

Did you read what the NASA engineer said?

Let me get this right,

Since you talked all kinds of smack and acted like this.


When you realize your wrong, you so shrewedly plant the "AoA ambush".

 :eek:


and now want to debate the parameters I calculated the Cl from which I took from YOUR calculations of the "real" Cl.  :cool:

In order to compare Cl conditions have to be the same.


Quote
You have to find out how the particular
value was generated (2D or 3D model) .. and there some other aerodynamics effects (like boundary layers and shock waves) which can effect the value as well. You can only apply the lift coefficient to a real case which is similar to how the original model was tested.


Your a piece of work.

You gotta be a Lawyer.  If not then you sure have missed your calling in life.  I sure hope your not learning to be an aeronautical engineer.  If you are could you let us know what company hires you?

Crumpp

Offline gripen

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« Reply #156 on: August 13, 2004, 04:54:20 PM »
Quote
Originally posted by Crumpp

Did you read what the NASA engineer said?


The right question is if Crumpp understood what a NASA engineer said.

gripen

Offline Crumpp

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« Reply #157 on: August 13, 2004, 05:08:16 PM »
So inspite of your sidetrack, which you were wrong in the end.

We can say that in a co-energy state the facts point to Merlin Power Spits never developing the ability to effectively fight 190's in a similar arena. The fight was always dissimilar, energy vs. angles or as Capt. Eric Brown put it "Blondes and Brunettes". Only when the Spitfire gained weight was it able to follow a zooming 190 with a chance of catching it without a large energy advantage. The Spitfire Mk XIV developed the ability to fight the similar fight and it was able to dominate the 190A.

This is confirmed by following the power and weight gains of both the 190 and the spit. Cross-referenced with performance charts and tactical trials.

Additionally, the extra weight and Horsepower the FW-190A8 gained improved it's zoom climb and dive acceleration. All traditional strengths of the 190. With a 3 lb increase to wing loading over the 190A5, CG adjustment, and a difference of HP-WT ratio in the 100th's, other performance areas suffered little or not at all. All in a much better armament package than the 190A5.

Crumpp

Offline Angus

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« Reply #158 on: August 13, 2004, 07:54:43 PM »
Gripen and Crumpp
How abou a truce? A little less heat.
Anyway, from a brief read-up, I must disagree with Crumpp last sttatement

"We can say that in a co-energy state the facts point to Merlin Power Spits never developing the ability to effectively fight 190's in a similar arena. The fight was always dissimilar, energy vs. angles or as Capt. Eric Brown put it "Blondes and Brunettes". Only when the Spitfire gained weight was it able to follow a zooming 190 with a chance of catching it without a large energy advantage."

Ok.
I'll give you a little essay, if you don't mind :)

The 190's best time was while meeting the earlier Spit V's (there were even Spit II's in service at the time). LW tactics at the time were in the general direction of engaging only under favourable cirkumstances (sun, cloud, superiour alt, speed, pos, dikta Boelce basically). At the time, the Spitfire's flying characteristics were fairly well known by the LW, while the 190's characteristics were completely unknown by the RAF.
(This actually went as far as a commando raid being planned to steal a 190 from a french field. This was abandoned when a 190 landed in the UK by accident. By then the only thing the RAF pilots knew (from gritty experience)was that at least their Spits would out-turn the 190)
A typical 190-Spit encounter in,say spring 1942 would definately NOT be on co-alt, co-E terms.
Usually the 190 was the attacker with a vastly superior E state. So was, often, the 109.
But the 190 held a card more, or rather 3.
In no particular order:
Firstly, A killing Firepower, typically double of the 109.
Secondly, As a heavier plane with even more speed, it carried more E (and due to aeodynamic shape, more zoom also) into the fray, hence an enhanced ability to finish a pass and make another one.
Thirdly, A phenomenal roll rate which enabled it to roll out of almost anything at very high speeds.

Crumpp: I honestly belive that a Co-alt, Co-E, head-on-merge could really cope with a Spit, 1 vs 1. C0-model, of course.
This would all depend on alt and exact speed, but with say 20 setups, I'd put my money on the Spit.
Spit V early vs 190 A5....bad for Spittie
Spit VII or IX LF booster vs 190A... bad for 190
And everything between, varying with alts.

Anyway, it would really be nice to have some zoom figures.
Without any knowledge of how much each plane zoomed at some given speed, it is tough to estimate if the zoom difference would count enough to make a reasonable difference.
Definately, a 190 bouncing a Spit at 200 miles more speed will be able to zoom away easily amd make another pass.
But Co-E, I am not so sure, unless the speed is really high.

Data on climb an zoom??

:)
It was very interesting to carry out the flight trials at Rechlin with the Spitfire and the Hurricane. Both types are very simple to fly compared to our aircraft, and childishly easy to take-off and land. (Werner Mölders)

Offline Nashwan

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« Reply #159 on: August 13, 2004, 08:04:44 PM »
I haven't got data on the zoom climb, but the RAF trial of Faber's 190 vs Spit F  IX (Merlin 61, not 66) said:

Quote
When both aircraft were flying at high cruising speed and pulled up into the climb from level flight, the Fw 190 had a slight advantage in the initial stages due to it's better acceleration. This superiority was slightly increased when both aircraft were pulled up into a climb from a dive


Note the use of the words slight, and slightly increased.

Offline gripen

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« Reply #160 on: August 13, 2004, 10:45:27 PM »
Quote
Originally posted by Crumpp
So inspite of your sidetrack, which you were wrong in the end.


Crumpp is most wellcome to prove his words with the calculations, if he can.

gripen

Offline Crumpp

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« Reply #161 on: August 13, 2004, 10:54:14 PM »
Quote
A typical 190-Spit encounter in,say spring 1942 would definately NOT be on co-alt, co-E terms.


Absolutely.  That was due to the Ground Controllers reading Radar and vectoring the units to intercept.  Not due to a lack of performance on the Luftwaffe Fighters.  The allies did the same thing.  

Between the FW-190A8, FW-190A5, and FW-190A3, the A3 will have the worst zoom of all.  It had less weight.

Between the FW-190A5 and the FW-190A8 the zoom IMO will slightly favor the A8.  All three gained some weight at each varient and gained Horsepower.  

None of the test list's a true zoom climb test. The climb test with the P47 goes something like this; The FW-190A3 outdistanced the P47 in the first 1500 feet below 10,000 ft.  Above 10,000 it outdistanced it in the first 1000 feet.  So it's initial momentum was pretty good.

I was rather glad to find the P47 dive test listed both angle, altitude, entering speed and throttle setting.

Keep in mind the Zeke tactical trails F4UO posted.  In it, when the planes were side by side the "advantages" were very small.  When the planes actually conducted Mock combats those "small" advantages became useful ones.  Read the distances and then read the mock combat results.

I don't think it should zoom to the moon by any means.  It should be able to zoom well enough to be useful in combat.  In a co-energy state the FW-190 should be able to zoom above the spit.  Given the much better but still unrealistic gunnery in AH, a 190 probably wouldn't be able to get out of AH gunnery range.  If the gunnery was realistic then the 190 would benefit more.

I also think it should be harder to fight than it is now.  Little better performance in the areas listed below but harder to fight.  Based on control force quirks, stall characteristics, trim changes under certain conditions, and the touchy elevator of the 190.

I think the Piggyness of the 190A8 comes from:

1. Lack of the ability to reverse quickly - Gollob comments that the FW-190A2 could reverse quicker than the Bf-109F4. Not turning, Rudder authority and roll rate.

2. Roll mechanics in AH.  In Ah if you roll and give it a little rudder, you will increase your rate of roll.  Buddy of mine has a 1938 Luscombe which is aerobatic rated.  We go flying together.  Putting rudder input when rolling is a bad thing in real life.  Your nose will yaw through the horizon and slow your rate of roll.  Too much rudder and you snaproll.  Many planes experience nose yaw without any rudder input.  In AH rolls are artificially stable.  That takes away the Fast And Stable advantage of the 190.  Because the 190's roll was stable, A pilot could change his entire lift vector at speeds up to 164 degrees/second (NACA roll rate max).  This is why the FW-190 is listed as "very manuverable".

3. Acceleration advantage below 275 mph-  Dive acceleration is a good indicator of level acceleration.  Maybe it was prop efficiency, drag, or something but for some reason the 190 was a great accelerating fighter thru 275-330 mph,  P47 trials actually list the acceleration differences.  Even the Spit XIV had trouble if the 190 dove due to it's acceleration.  Above that it is rather unremarkable and even slow.  It is interesting that 350mph was the speed both the control forces became heavier suddenly and a trim change occurred.

4. Zoom climb - Some of this is net lag lag but the 190 should have a combat useful zoom.  Nobody is going to care how great it zooms offline.

5.  Level speeds, dive speed, climb speed, and climb rate should come exactly off the LW graphs and out of the pilot's manual.

Flaps should be modeled to their actual settings and tolerances as per pilots manual.

6. 115 liter Aux tank, which both the FW-190A5 and FW-190A8 have in AH should be an option in the hanger.  Only the A8 should have the option of taking the Aux tank.  Taking the Aux tank would equip the A8 with C3 "Emergency Power" and add 120kg to the weight.

7.  Winterization kits should be removed from the FW-190 weights unless it’s a Russian or Finnish winter scenario.  It was a kit used in sub-artic conditions in Russia and Norway.  I lived in Germany for 3 years and never had a problem with my oil freezing solid in my car. 30Kg of extra oil and 25Kg off extra capacity oil pan and pump to pump gas into the oil system.  

8.  The Mg 131 ammo hoppers would be reduced to the 400 round capacity of the jagd-einsatz's listed in the Pilots manual.

9. Wgr. 21 rocket tubes should be jettisonable as they were in real life.

That is my thoughts.  No real major changes.  Just some tweaks that will make the plane more realistic IMO.

You guys examine the trials.  I made a matrix to keep track of the different planes.  If you are missing any of them let me know.

You guys tell me what you think it should be after reviewing the tactical trials.  Thanks BTW for you input.

Crumpp

Offline Guppy35

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« Reply #162 on: August 13, 2004, 11:01:56 PM »
Quote
Originally posted by Angus
Gripen and Crumpp
How abou a truce? A little less heat.
Anyway, from a brief read-up, I must disagree with Crumpp last sttatement

"We can say that in a co-energy state the facts point to Merlin Power Spits never developing the ability to effectively fight 190's in a similar arena. The fight was always dissimilar, energy vs. angles or as Capt. Eric Brown put it "Blondes and Brunettes". Only when the Spitfire gained weight was it able to follow a zooming 190 with a chance of catching it without a large energy advantage."

Ok.
I'll give you a little essay, if you don't mind :)

The 190's best time was while meeting the earlier Spit V's (there were even Spit II's in service at the time). LW tactics at the time were in the general direction of engaging only under favourable cirkumstances (sun, cloud, superiour alt, speed, pos, dikta Boelce basically). At the time, the Spitfire's flying characteristics were fairly well known by the LW, while the 190's characteristics were completely unknown by the RAF.
(This actually went as far as a commando raid being planned to steal a 190 from a french field. This was abandoned when a 190 landed in the UK by accident. By then the only thing the RAF pilots knew (from gritty experience)was that at least their Spits would out-turn the 190)
A typical 190-Spit encounter in,say spring 1942 would definately NOT be on co-alt, co-E terms.
Usually the 190 was the attacker with a vastly superior E state. So was, often, the 109.
But the 190 held a card more, or rather 3.
In no particular order:
Firstly, A killing Firepower, typically double of the 109.
Secondly, As a heavier plane with even more speed, it carried more E (and due to aeodynamic shape, more zoom also) into the fray, hence an enhanced ability to finish a pass and make another one.
Thirdly, A phenomenal roll rate which enabled it to roll out of almost anything at very high speeds.

Crumpp: I honestly belive that a Co-alt, Co-E, head-on-merge could really cope with a Spit, 1 vs 1. C0-model, of course.
This would all depend on alt and exact speed, but with say 20 setups, I'd put my money on the Spit.
Spit V early vs 190 A5....bad for Spittie
Spit VII or IX LF booster vs 190A... bad for 190
And everything between, varying with alts.

Anyway, it would really be nice to have some zoom figures.
Without any knowledge of how much each plane zoomed at some given speed, it is tough to estimate if the zoom difference would count enough to make a reasonable difference.
Definately, a 190 bouncing a Spit at 200 miles more speed will be able to zoom away easily amd make another pass.
But Co-E, I am not so sure, unless the speed is really high.

Data on climb an zoom??

:)


Can't forget about standard tactics for the Spit XII.  Those guys flew along below the 190s and 109s hoping they'd come down as the XII would then turn into them and was good enough or better then the 109 and 190 at those medium to low alts.  The XIIs expected to get bounced.

And they were the high scoring Spit Squadrons in the fall of 43 with their best day October 20, 1943 when they claimed 9 for no loss.

Dan/Slack
Dan/CorkyJr
8th FS "Headhunters

Offline gripen

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« Reply #163 on: August 14, 2004, 05:18:39 AM »
Quote
Originally posted by Crumpp
Well running your numbers for the FW-190 at 300Km through the downwash formula matches the computer similation almost exactly.


Cl (your calculation run through downwash effect) = .1296


This number has nothing to do with my calculations. The only Cl value for the Fw 190 at 300km/h I had posted before Crumpp's post is  Cl 1,451 at 3 g load. If converted from 3D to 2D ie downwash effect of aspect ratio 6,02 is removed then the Clo is 1,5715.

Crumpp is making up numbers here.

gripen

Offline Angus

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« Reply #164 on: August 14, 2004, 08:44:04 AM »
Guppy:
Do you have more data on these Spit XII missions?

I remember Johnny Johnsson mentioning this tactics. He flew a mission with Harris (the ace). This was the tactic Harris used. He would let the 190's bounce his flight, and high break at the right moment. After that, the chase was downhill, and not too far, I think they were cruising at like 12000 feet.
It was a trap. I think they used Spit XIV's which outperformed the 190's in every aspect except roll at that alt. They just needed them to get down there.
I'll try to dig up more.
It was very interesting to carry out the flight trials at Rechlin with the Spitfire and the Hurricane. Both types are very simple to fly compared to our aircraft, and childishly easy to take-off and land. (Werner Mölders)