Author Topic: P-47 flaps  (Read 15118 times)

Offline gyrene81

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Re: P-47 flaps
« Reply #90 on: June 26, 2011, 05:06:20 PM »
That being the case, it makes one wonder how HTC decided the speed limits for each increment of the P-47's flaps in AH?
there are a few aircraft that question applies to
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Offline Karnak

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Re: P-47 flaps
« Reply #91 on: June 26, 2011, 05:36:57 PM »
there are a few aircraft that question applies to
Indeed.  I am curious about the method used for all of them.
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Offline gyrene81

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Re: P-47 flaps
« Reply #92 on: June 26, 2011, 07:19:02 PM »
i know the copy of the p-40 manual i have which covers mostly the later models but includes information for the early models as well, has several "do not do this" type things with illustrations, mostly manuevers like spins, outside loops, tail slides, and a "do not taxi with flaps deployed".

an interesting supposed online copy" of a p-40 manual that i've had bookmarked for while, shows a flap speed warning in section 3:

"Flaps should not be lowered at over 140 m.p.h. and should be raised for taxiing."
http://www.keyos.org/avia/usa/curtis_tomahawk_p40/manual1.htm
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Offline Stoney

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Re: P-47 flaps
« Reply #93 on: June 26, 2011, 07:58:47 PM »
i know the copy of the p-40 manual i have which covers mostly the later models but includes information for the early models as well, has several "do not do this" type things with illustrations, mostly manuevers like spins, outside loops, tail slides, and a "do not taxi with flaps deployed".

an interesting supposed online copy" of a p-40 manual that i've had bookmarked for while, shows a flap speed warning in section 3:

"Flaps should not be lowered at over 140 m.p.h. and should be raised for taxiing."
http://www.keyos.org/avia/usa/curtis_tomahawk_p40/manual1.htm


Just note that the online transcription is for a "Tomahawk I" manual.  So first, its British, and second, its probably not representative of later manuals.
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Offline bozon

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Re: P-47 flaps
« Reply #94 on: June 27, 2011, 04:13:00 AM »
That being the case, it makes one wonder how HTC decided the speed limits for each increment of the P-47's flaps in AH?
I guess that either they have some source that does specify limitation for some deployment angles or that they interpolate/extrapolate for other sources.

Personally I'd rather see all flaps extremely limited in their usage. In the current state (other flight sims are the same) the nasty punishments of misuse of flaps are not apparent in the flight models, which makes the over-usage of flaps a no brainer. If G also played a role in flap limits, flaps either jammed or blown-up asymmetrically, and spins were really nasty we would see them used much less. Imagine pulling a hard turn at 250 mph when only one flap auto retracts (as some did in reality), throwing the plane into a spin that takes 5000 feet to get out of.
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Offline bj229r

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Re: P-47 flaps
« Reply #95 on: June 27, 2011, 06:50:33 AM »
It wasn't easy at all... Which is one reason why flaps were not commonly used in dogfights. It takes practice and mental training to do multiple things at one time. Trying learning Heel and Toe braking/down shifting... Takes a lot of practice to get it nailed consistently.
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Offline gyrene81

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Re: P-47 flaps
« Reply #96 on: June 27, 2011, 08:51:34 AM »
I guess that either they have some source that does specify limitation for some deployment angles or that they interpolate/extrapolate for other sources.
hitech has said they use the limitations shown in the pilot manuals.

Thor:

To begin with think about what you wish.  This is not a data discussion, this is simply a game play discussion. At my first glance I can think of 3 methods of flap choices.

1. Try model the real structure limit, (this will at best be a guess, because very few planes flaps were tested to the breaking point). Other issues that come to mind are not just structure limits, but moving force limits. It will be almost impossible to find this type of data on very many planes.

2. Model as we do now, implementing the pilot manual flap speed limitations.

3. Make some assumptions and guesses that different methodologies were used when writting manuals, and then try to model all flaps as if the manuals were all written with the same mythology.


I would say method 1 is pretty much a no go simply because people would push flaps far beyond what most pilots would in the war and hence the fights would not resemble much of real world fights.

 #2 has possibilities but also very quickly becomes open to interpretation.

Thor, if you wish to know how to approach this, approach it from facts and game play, not from a desire to change 1 plane. How to approach me is simple, assume I have the desire to make an accurate game, assume I can make mistakes, but will always fix mistakes if I can. Try your best to look at modeling from a wide perspective of issues, not just 1 issue from 1 view point.

W,aker in a thread on the brewster is a good example,
http://bbs.hitechcreations.com/smf/index.php/topic,273833.0.html

 he points out problems and tries to find data, but does not demand it be fixed and does not make any assumptions about how we do not like the Brewster and hence did not model it correctly.

HiTech
http://bbs.hitechcreations.com/smf/index.php/topic,260495.msg3429425.html#msg3429425



Personally I'd rather see all flaps extremely limited in their usage. In the current state (other flight sims are the same) the nasty punishments of misuse of flaps are not apparent in the flight models, which makes the over-usage of flaps a no brainer. If G also played a role in flap limits, flaps either jammed or blown-up asymmetrically, and spins were really nasty we would see them used much less. Imagine pulling a hard turn at 250 mph when only one flap auto retracts (as some did in reality), throwing the plane into a spin that takes 5000 feet to get out of.
that would not go over very well considering the amount of documentation where pilots acknowledge the use of combat flap settings at speeds over 250mph, the type of stuff some people call "anecdotal evidence" on one hand then turn around and explicitly use the same as "valid evidence" in a different discussion. depending on the country of origin, some pilot manuals have specific "do not" warnings, others do not. since no on actually dies in toonville, give people an inch and they will take a mile. for instance, the p-40, p-47 manuals give specific instructions on how to perform a "safe dive" and the possible consequences for not following the procedures, including a blown engine or worse, but in toonville people will go into a dive at full wep, exceed the "maximum safe speed" and are able to recover. those same manuals state spins and snap rolls should not be performed, especially at high speeds, yet people will still perform those maneuvers without consequence or any thought of such. programming a limitation or a specific consequence to prevent those maneuvers will do nothing more than make people mad.
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Offline hitech

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Re: P-47 flaps
« Reply #97 on: June 27, 2011, 09:55:30 AM »
Quote
hitech has said they use the limitations shown in the pilot manuals.

I may be wrong but I doubt I have ever stated anything like this.

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Offline Stoney

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Re: P-47 flaps
« Reply #98 on: June 27, 2011, 10:18:54 AM »
hitech has said they use the limitations shown in the pilot manuals.
http://bbs.hitechcreations.com/smf/index.php/topic,260495.msg3429425.html#msg3429425


that would not go over very well considering the amount of documentation where pilots acknowledge the use of combat flap settings at speeds over 250mph, the type of stuff some people call "anecdotal evidence" on one hand then turn around and explicitly use the same as "valid evidence" in a different discussion. depending on the country of origin, some pilot manuals have specific "do not" warnings, others do not. since no on actually dies in toonville, give people an inch and they will take a mile. for instance, the p-40, p-47 manuals give specific instructions on how to perform a "safe dive" and the possible consequences for not following the procedures, including a blown engine or worse, but in toonville people will go into a dive at full wep, exceed the "maximum safe speed" and are able to recover. those same manuals state spins and snap rolls should not be performed, especially at high speeds, yet people will still perform those maneuvers without consequence or any thought of such. programming a limitation or a specific consequence to prevent those maneuvers will do nothing more than make people mad.

The problem is that you have this problem across almost every aspect of the game.  Engine limitations are an excellent example for one.  A lot of the restrictions that are in place were restrictions imposed by the manufacturer or by the using air force, regardless of whether or not the aircraft could perform differently in reality.  Robert Johnson used to talk about pulling 75" of MP in his Jug after his mechanic modified the turbo mechanism--it was possible to do, but should it be included in-game?  No.  Same for the flap settings.  There has to be some sort of baseline.  The flap deployment speeds for the P-51 and P-38, two examples previously mentioned and discussed, have documentation to support their use at the speeds in question.  [Rhetorical question not directed at you Gyrene] Why not just ask HTC how they arrived at the flap deployment speeds of the P-47 if you can't find documentation, instead  of "demanding" equality with what's represented for the Luftwaffe rides, in order to correct some sort of perceived inequity?  I guarantee that the 109 and 190 in-game achieve the same modeling fidelity as the U.S. rides, at least as far as HTC has documentation to make them so.  Now, if the Luftwaffe special instruction #4056, that detailed new approved flap deployment speeds, got burned up with Goering's dresses on 7 May, then we may never know, but it won't be because HTC didn't want the Luftrides to perform properly.
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Offline Charge

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Re: P-47 flaps
« Reply #99 on: June 27, 2011, 11:24:12 AM »
There was a baseline for flap deployment speed. Was.

"I guarantee that the 109 and 190 in-game achieve the same modeling fidelity as the U.S. rides, at least as far as HTC has documentation to make them so.  Now, if the Luftwaffe special instruction #4056, that detailed new approved flap deployment speeds, got burned up with Goering's dresses on 7 May, then we may never know, but it won't be because HTC didn't want the Luftrides to perform properly."

Of course, would there be any sense without that assumption? However, lots of things got lost in 1945 when Germany burned but that is not a good reason to cherry pick data and presume these "pursuit" planes had something others didn't.

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Offline bozon

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Re: P-47 flaps
« Reply #100 on: June 27, 2011, 11:57:52 AM »
that would not go over very well considering the amount of documentation where pilots acknowledge the use of combat flap settings at speeds over 250mph, the type of stuff some people call "anecdotal evidence" on one hand then turn around and explicitly use the same as "valid evidence" in a different discussion.
I didn't say it was impossible or never done. What I said was that it was dangerous to do so and some squadron commanders ordered pilots not to use them, even though they brag about doing so, implying it was not standard practice - you do not brag about lowering flaps for landing like everyone else. The dangers involved in deploying flaps in hard maneuvers are not well represented in the flight model. Not to belittle the FM, we are talking about an extreme corner of the flight envelope and things beyond "simple" aerodynamics.
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Offline FLS

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Re: P-47 flaps
« Reply #101 on: June 27, 2011, 11:59:47 AM »
Gyrene81 you should probably highlight this part in bold also.

 "#2 has possibilities but also very quickly becomes open to interpretation."

Offline gyrene81

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Re: P-47 flaps
« Reply #102 on: June 27, 2011, 12:16:00 PM »
I may be wrong but I doubt I have ever stated anything like this.

HiTech
so the bolded text "...implementing the pilot manual flap speed limitations" directly quoted from that discusson wasn't you?  :headscratch:  maybe i misinterpreted the way it was written.




The problem is that you have this problem across almost every aspect of the game.  Engine limitations are an excellent example for one.  A lot of the restrictions that are in place were restrictions imposed by the manufacturer or by the using air force, regardless of whether or not the aircraft could perform differently in reality.  Robert Johnson used to talk about pulling 75" of MP in his Jug after his mechanic modified the turbo mechanism--it was possible to do, but should it be included in-game?  No.  Same for the flap settings.  There has to be some sort of baseline.  The flap deployment speeds for the P-51 and P-38, two examples previously mentioned and discussed, have documentation to support their use at the speeds in question.  [Rhetorical question not directed at you Gyrene] Why not just ask HTC how they arrived at the flap deployment speeds of the P-47 if you can't find documentation, instead  of "demanding" equality with what's represented for the Luftwaffe rides, in order to correct some sort of perceived inequity?  I guarantee that the 109 and 190 in-game achieve the same modeling fidelity as the U.S. rides, at least as far as HTC has documentation to make them so.  Now, if the Luftwaffe special instruction #4056, that detailed new approved flap deployment speeds, got burned up with Goering's dresses on 7 May, then we may never know, but it won't be because HTC didn't want the Luftrides to perform properly.
i agree stoney, there has to be a baseline but what dictates that baseline, the pilot manual or manufacturer testing documents or something else? if it is the pilot manuals, is it the speeds in the take off instructions or landing instructions, or maximum safe speeds? obviously there is some room for interpretation if a mechanical adjustment such as the flap mechanism on the bf109 is artificially prevented from working even 5 degrees at speeds above "maximum safe speed for full deployment". i have pdf versions of original bf109b/e/f/g/k pilot manuals that people have been kind enough to share on other sites, and i've gone through the painstaking process of translating most of them. i'm still attempting to translate the 190 pilot manuals i've acquired. i have only seen one document that states the luftwaffe command imposed flap speed limitations on pilots and that was supposedly a u.s. intelligence document that was dated sometime in november 1944, and i couldn't get a copy of it. if you have a copy of that luftwaffe special instruction #4056, would you mind sharing it? you're the first person i've seen that mentions it.

but this isn't about just the luftwaffe aircraft. the p-40, p-47 and p-39 manuals have specific warnings and descriptive consequences if certain things are done/not done, yet some things can be done in ah without consequence due to no artificial limitations on those actions. there is no doubt that the p-47, p-51, f6f, f4u and other u.s. fighters could deploy a combat flap setting at speeds over 300 mph, as combat reports from pilots show, but the manuals don't have that information in them. try imposing an artificial barrier below 250 mph in any of those aircraft because the information is not in the pilot manuals and a riot will ensue.

with all of the knowledge and information that has passed just on these boards by people like stoney, krusty, karnak, colmbo and numerous others, is anyone actually foolish enough to believe that the u.s. was the only country in the world that had aircraft that could deploy as little as 10 degrees of flap deflection over 190mph ias?
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Offline Stoney

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Re: P-47 flaps
« Reply #103 on: June 27, 2011, 01:07:07 PM »
if you have a copy of that luftwaffe special instruction #4056, would you mind sharing it? you're the first person i've seen that mentions it.

Sorry, I made it up in an attempt at sarcasm.

Quote
...is anyone actually foolish enough to believe that the u.s. was the only country in the world that had aircraft that could deploy as little as 10 degrees of flap deflection over 190mph ias?

Its not about "foolish".  Its about what is documented.
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Offline gyrene81

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Re: P-47 flaps
« Reply #104 on: June 27, 2011, 01:32:52 PM »
Sorry, I made it up in an attempt at sarcasm.
ah gotcha  :aok  or rather you got me with it.


Its not about "foolish".  Its about what is documented.
ok, so look at the documentation...the easiest documentation to find is pilot handbooks, neither the u.s. or the luftwaffe manuals state anything about combat flaps, but they do have specifics about maximum safe speeds and safe take-off/landing procedures. so in the absence of information, do what?
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