Author Topic: F4Us and 109s are great fun these days  (Read 3150 times)

Offline HoHun

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F4Us and 109s are great fun these days
« Reply #60 on: May 13, 2006, 02:04:58 AM »
Hi Badboy,

>However, if you assume a roughly concentric attack, the Spitfire's small turn radius advantage almost certainly won't be enough to allow him to pull lead for a shot.

Hm, I see no reason why it shouldn't. Falling back decreases the angles in the gun sight, after all.

>If I were the 109F driver fighting under the conditions shown in that diagram I wouldn't be concerned about an over shoot.

Well, it closing at all means that the angles in the gun sight increase, making a shot more difficult.

Maybe there is a way to graph this in terms of relative angle over time? You know I have always been dissatisfied with the typical manoeuvring diagrams without being able to come up with something better myself :-)

Regards,

Henning (HoHun)

Offline gripen

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F4Us and 109s are great fun these days
« Reply #61 on: May 13, 2006, 02:33:04 AM »
I have never learned to use flaps properly in the AH but the advantage of the use of full flaps might be some what unrealistic. There is not much real data sets available, the only I'm aware are NACA tests on the F2A-3 and RAE calculations on Spitfire. Both these sets indicate that at low altitude and depending on available power, the max turn rate is reached with partial flaps and above certain amount flap deflection there is not much change in the radius of the turn (infact some of the data indicate slight increase at very high flap angles).

gripen

Offline Widewing

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F4Us and 109s are great fun these days
« Reply #62 on: May 13, 2006, 08:14:51 AM »
Quote
Originally posted by gripen
I have never learned to use flaps properly in the AH but the advantage of the use of full flaps might be some what unrealistic. There is not much real data sets available, the only I'm aware are NACA tests on the F2A-3 and RAE calculations on Spitfire. Both these sets indicate that at low altitude and depending on available power, the max turn rate is reached with partial flaps and above certain amount flap deflection there is not much change in the radius of the turn (infact some of the data indicate slight increase at very high flap angles).


My experience with the AH2 Spitfires tells me that there is little gained by using flaps for sustained turning. They can tighten up turn radius briefly, but the penalty in speed and turn rate is rather severe if kept down for longer than half of a turn. I assume that HTC models the type of flaps employed.

I can see where the added drag will hurt a Buffalo as it's very much under-powered. We have that problem with the F4F-4. Both use a simple Split-type flap, as does the Spitfire. I believe the Bf 109 uses a Plain flap, similar to that employed on the P-51. It appears that the way the Plain flap is modeled, it has a better balance between lift/drag than the Split flaps provide.

Another factor is that the flaps on Spitfire are all or nothing, whereas the 109 pilot can select how much flap he wants.

My regards,

Widewing
My regards,

Widewing

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Offline Widewing

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F4Us and 109s are great fun these days
« Reply #63 on: May 13, 2006, 08:59:16 AM »
Quote
Originally posted by HoHun
Hi Badboy,

>However, if you assume a roughly concentric attack, the Spitfire's small turn radius advantage almost certainly won't be enough to allow him to pull lead for a shot.

Hm, I see no reason why it shouldn't. Falling back decreases the angles in the gun sight, after all.

>If I were the 109F driver fighting under the conditions shown in that diagram I wouldn't be concerned about an over shoot.

Well, it closing at all means that the angles in the gun sight increase, making a shot more difficult.

Maybe there is a way to graph this in terms of relative angle over time? You know I have always been dissatisfied with the typical manoeuvring diagrams without being able to come up with something better myself :-)

Regards,

Henning (HoHun)


While the angles decrease, there is no change to the fact that the Spitfire is already turning as tight as possible, meaning that the pilot cannot readily "pinch" it in to gain lead without negative consequence, usually in the form of sudden wing drop. When that happens, he must ease off the stick and reduce bank angle to recover. That only increases his troubles as he must then re-establish his maximum turning bank/angle. In the meanwhile, the 109 has continued around the circle and will rapidly work its way into the Spitfire's rear hemisphere. If the Spitfire continues turning in the same direction, the 109 can simply pull nose high to cut the corner and get a guns solution. If the Spitfire pilot reverses his turn, he will inevitably find that he will be crossing in front of the 109 and the resulting consequence is usually fatal.

Because the 109F-4 has marked advantage in climb rate over the Spitfire Mk.V, any time it appears that the Spitfire pilot is pinching his turn, the 109 pilot simply pulls his nose above the horizon. At the absolute limit, the SpitV cannot follow. He must ease off his turn considerably or risk an immediate accelerated stall. If that should happen the fight will be over in short order.

The problem for the Spitfire pilot is this: He must gain a guns solution before the fight degrades to a low speed lufberry. Once in a sustained turn, the Spitfire Mk.V is at distinct disadvantage against the 109F-4. A smart 109F pilot will attempt to establish a lufberry, where he can take full advantage of the 109's faster turn rate and superior climb. In most cases, the Spitfire will not enter the lufberry close to the 109's six o'clock, meaning that his chances to obtain a guns solution will be minimal. Even flying intersecting circles cannot promise the Spitfire an opportunity if the 109 pilot is alert. Again, he can force the fight "up hill" and neutralize that opportunity.

I have some films that demonstrate the above quite clearly.

If the reader follows the entire thread, he will discover that the 109F-4 does have some weaknesses that may be exploited by a skilled pilot. But even with that factored in, a dogfight beginning with equal pilots, E and altitude will probably be won by the 109F-4.

Understand that I'm not arguing that the current flight model is historically accurate. All I'm stating is that this is how it currently exists and it can be exploited to the extent that the 109F-4 is currently one of the best pure dogfighters in the game. Unless you are flying a Zero or perhaps a Hurricane, you simply cannot expect to beat the 109F-4 in a low-speed brawl. If the 109F pilot is better than you to begin with, the fight will be short and futile. Therefore, if you can identify the 109 as an F model, avoid trying to turn with it.

My regards,

Widewing
My regards,

Widewing

YGBSM. Retired Member of Aces High Trainer Corps, Past President of the DFC, retired from flying as Tredlite.

Offline scottydawg

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F4Us and 109s are great fun these days
« Reply #64 on: May 13, 2006, 09:21:56 AM »
On Widewing's recommendation in the TA I also flew the 109 F-4.

It is a tight turner and very capable.  That being said, if you have stall limiter turned on you will probably think it's a POS.  The F-4 turns its best on flaps right above stall, and my impression is that once you get about 20 mph above stall in turns, the elevators get mushy.  If you have stall limiter turned off, the F-4 has a WICKED stall, it's ugly and scary and will catch you off guard the first few times, pretty predictable though.

It's a great plane, but I hate the visibility issues.  The canopy belongs on a freaking tank.

Offline HoHun

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F4Us and 109s are great fun these days
« Reply #65 on: May 13, 2006, 01:11:26 PM »
Hi Widewing,

>While the angles decrease, there is no change to the fact that the Spitfire is already turning as tight as possible, meaning that the pilot cannot readily "pinch" it in to gain lead without negative consequence, usually in the form of sudden wing drop.

I admit that Badboy's graph inspired me to think about a situation where one aircraft is very close to the tail of the other.

It becomes a question of geometry there, which is a bit different than when you consider a less one-sided situation.

For example, with the Me 109 20° ahead of the Spitfire in the turn, and the Spitfire passing the same point of space the Me 109 passed, the Me 109 would initially be in the line of sight of the Spitfire (assuming a 20° angle-of-attack, just for the sake of round numbers). For lack of lead, the Spitfire couldn't get any hits from that situation. However, with both planes continuing a steady turn, the Me 109 would pull away from the Spitfire and thus drop down from the centre of the Spitfire's gunsight into position for a lead shot.

(Of course, what exactly is going to happen depends on the numerical relation of both planes' speeds and turn rates, so my description applies only to one possible set of data points.)

Badboy rightly pointed out that this is the effect of non-concentric circles, but I don't think contentric circles are all that typical anyway, and so I decided to question his assessment that a slight advantage in turn rate is more important than a slight advantage in turn radius :-)

Regards,

Henning (HoHun)

Offline Gunzo

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F4Us and 109s are great fun these days
« Reply #66 on: May 13, 2006, 02:26:30 PM »
Quote
Originally posted by HoHun
For example, with the Me 109 20° ahead of the Spitfire in the turn,
Henning (HoHun)

The other day I flew some 109F v Spit engagements with Infensus in the TA. We flew a large number of separate engagements, and we swapped planes to eliminate the pilot skill factor. No matter what we did, the guy driving the Bf109F invariably won.

I think you are trying to over analyse the situation. Of course if you place the 109 in a situation where he has almost already lost, he probably will. Place him in a neutral position, and he almost certainly will win.

Go and do some engagements with a buddy, you will see that what Badboy and Widewing are saying is 100% correct.

Gunzo
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Offline HoHun

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F4Us and 109s are great fun these days
« Reply #67 on: May 13, 2006, 03:54:33 PM »
Hi Gunzo,

>No matter what we did, the guy driving the Bf109F invariably won.

I'm quite ready to believe that :-)

However, currently I'm interested in the boffins' perspective on the affair, which supplements the question "Who won?" with the question "How could he win?" :-)

Regards,

Henning (HoHun)

Offline Urchin

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F4Us and 109s are great fun these days
« Reply #68 on: May 13, 2006, 04:06:35 PM »
The F4 will win because, as of right now, it can turn harder than the Spit 5.  So if the Spit 5 is almost in a position for a shot, the F4 breaks hard into the Spit.  If the Spit 5 misses that one shot, and decides to follow the F4 through the turn, he will never get another shot (unless he's got a fair amount of extra energy he can scrub off).  

It is really simple actually.

Offline gripen

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F4Us and 109s are great fun these days
« Reply #69 on: May 13, 2006, 04:36:08 PM »
Quote
Originally posted by Widewing
My experience with the AH2 Spitfires tells me that there is little gained by using flaps for sustained turning. They can tighten up turn radius briefly, but the penalty in speed and turn rate is rather severe if kept down for longer than half of a turn. I assume that HTC models the type of flaps employed.


No idea how the drag with flaps is modeled in AH but the RAE calculated data on Spitfire gives following values at 12k (from RAE RM No.  2349):



My impression is that full flap setting (85deg) in the Spitfire was purposedly adjusted to give some amount of extra drag for landing (optimal would have been around 60deg or possibly a bit less for minimum turn radius and around 30deg for the best turn rate but such setting was of course not available). Generally full flaps probably gave their best advantage at too slow speed for combat use in most cases.

gripen

Offline Gunzo

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« Reply #70 on: May 13, 2006, 06:10:51 PM »
Quote
Originally posted by HoHun
I'm interested in the boffins' perspective on the affair, which supplements the question "Who won?" with the question "How could he win?" :-)

I think that has already been explained.

The note on that diagram says that the BF109F has a better turn rate and that the small difference in turn radius would be considered insignificant in comparison to the turn rate advantage. I found that to be true. The 109F can out turn the Spitfire, it is as simple as that.

You have read the theory, it is supported by post 2.07 patch experience, and it is confirmed by two trainers... what was your question again?


« Last Edit: May 13, 2006, 07:33:37 PM by Gunzo »
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Offline MOSQ

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F4Us and 109s are great fun these days
« Reply #71 on: May 13, 2006, 11:02:14 PM »
Quote
Originally posted by gripen
No idea how the drag with flaps is modeled in AH but the RAE calculated data on Spitfire gives following values at 12k (from RAE RM No.  2349):



My impression is that full flap setting (85deg) in the Spitfire was purposedly adjusted to give some amount of extra drag for landing (optimal would have been around 60deg or possibly a bit less for minimum turn radius and around 30deg for the best turn rate but such setting was of course not available). Generally full flaps probably gave their best advantage at too slow speed for combat use in most cases.

gripen


Are our Spits supposed to have 3 flap settings beyond no flaps?

Offline Gunzo

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F4Us and 109s are great fun these days
« Reply #72 on: May 13, 2006, 11:28:07 PM »
Quote
Originally posted by MOSQ
Are our Spits supposed to have 3 flap settings beyond no flaps?

Wondered who was going to be first to ask :)

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Offline HoHun

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F4Us and 109s are great fun these days
« Reply #73 on: May 14, 2006, 12:12:56 AM »
Hi Gunzo,

>You have read the theory, it is supported by post 2.07 patch experience, and it is confirmed by two trainers... what was your question again?

My question is the one you failed to answer.

By the margin you missed the point, I'd even say my question is the one you failed to read.

Kind regards,

Henning (HoHun)

Offline tikky

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F4Us and 109s are great fun these days
« Reply #74 on: May 14, 2006, 03:04:53 AM »
why not just give back the spit 5 the extra +16 boost is order for spit 5 to stay on par with 109F...:rolleyes: :rolleyes: :rolleyes: