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Author Topic: Engine durability & structural integrity after combat damage  (Read 4874 times)

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Mabroc

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Engine durability & structural integrity after combat damage
« on: August 09, 2011, 06:57:37 PM »

I made this post on the UP forum, 30 views no reply yet:

http://ultrapack.tuttovola.org/index.php/topic,4740.msg44366.html#msg44366

Hello gentlemen, I have a humble request for the DM of the in-line engines of Russian fighters and P-39/P-63 (what a coincidence! they use those too!). As all we know, in the bf-109, Spitfire, P-51, etc when you get hit on the engine and it starts to leak oil and/or glycol the engine will overheat by lack of cooling sooner or later (sooner at more high RPM´s), you have to disengage and run if possible, but you will be gliding soon enough (5-10m).

The Il-2 have the same real issue if you hit it on the big oil cooler on the belly. But the damn P-39/63 can fly all day long leaking, they don´t lost power during the fight, I have been fighting them online sometimes more than 10m after I get some hits on them, and they continue to fight without problems, climbing, running, turning hard, etc. That was applied to the LaGG´s, and Yak´s too, but I don´t usually met them online so I not so sure, I should run some offline test, so forgive me if I wrong.

By the way, the La-5 are pretty though with the delta wood construction (maybe too much?) but the Yak´s are only a little weaker, not by much. If Im not mistaken (correct me if Im wrong please) the soviets wanted to make a very light combat fighter interceptor so the Yak-1/3 (very light) and Yak 7/9 (more normal weight and endurance and range) were constructed like a zero, less possible weight so they have great performance. So a 20mm hit that a Spitfire or La-5 could withstand would make more damage and weaken the structural integrity much more on the Yak. I don´t see that on the game, which leads to my next request....

The game seems to lack structural limitation after damage (like when we now pull too much G) at almost any case. Tempest and Typhoons for example loose the tail easily with only a couple hits of 20mm, I suspect that its intended because the tail was problematic on that plane at structural level, they needed to reinforce it to withstand combat maneuvers (they usually came off on the first typhoons in dives) so when you weaken that tail section the tail just break, its not the power of your gun, its the plane weak spot so the high structural pressure there brake it when the strength is lower. So I suppose they put very little HIT POINTS there to mimic a weak structural point. But the real limitation on amount of G you can pull without breaking that wing full of holes, loose your perforated tail or elevator is not there really.

I remember fondly the ¨Red Baron II/3D¨ game, when you got some damage into the plane it would squeal and scream more easily (wood creaking, canvas tensing) and you could not make the same maneuvers than before without loosing a wing. And when you came to land, the people on the ground seeing your damaged plane coming back would send the fire truck to the ¨runway¨ in your general direction, the ambulance too when you got wounded if Im not mistaked, because IT WAS 13 YEARS AGO!!!!

Im not a modder, and the game already is a big improvement with UP 3.0, but could be it possible to add combat structural failure?? I mean, we have the damage system there, and now the G stress system too, we only need  to combine those too. You have a very big hole on your wing, you try a hard pull or roll and it will came off, more easily to happen in a Fw-190 for example than in a Spit (rolling hard) because of the high roll speed. Im tired of seeing Russian and Allied planes full of big holes doing perfectly controlled tight maneuvers, like their planes were almost intact. I can barely fly straight in a damaged Fw-190 or Bf-109 (I mean with big holes on the wings, not the little MG holes)

Any input or discussion is welcome!!!
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Schwieger

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Re: Engine durability & structural integrity after combat damage
« Reply #1 on: August 09, 2011, 07:57:41 PM »

+1

Earlier today I was winging with a squadmate and he ran into the same issue when fighting P-39.
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Pursuivant

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Re: Engine durability & structural integrity after combat damage
« Reply #2 on: August 09, 2011, 08:46:07 PM »

+1. AFAIK, there's nothing which makes aircraft progressively more vulnerable to damage from G-forces, although realistically, airframe damage should also reduce the plane's ability to survive high G maneuvers. A mod which increases the chance of catastrophic failure if your airplane is damaged would be most welcome.

I'm not sure if the Soviet planes are less vulnerable to engine damage. I don't fly them that much. IIRC, though, the MiG-3 is hideously vulnerable to engine hits, and the LaGG-3 isn't much better.  Flying with and against the P-39, I don't find it invulnerable to engine hits, although I can't recall a situation where the engine has died on me. Since there have been documented cases where Soviet equipment from the original game is superior to equivalent Axis equipment, this is something someone who understands Java should look into.
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SAS~Anto

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Re: Engine durability & structural integrity after combat damage
« Reply #3 on: August 10, 2011, 10:09:46 AM »

Oh yeah, reduced G limits on damage would be great :)

Now for engine damage on certain aircraft. I can say now that it is modelled on all the above BUT there may be a practical reason as to why some are more prone than others. First, lets look at some design aspects. How much armour does the aircraft have? Where are the fuel/oil/coolant lines/tanks/reservoirs? How much fuel/oil/coolant does it carry? How is the engine cooled? When you consider all this, you can predict some engines are more prone to failure in combat conditions. Classic example is the Merlin vs Griffin. The Merlin (generally known to be a reliable engine) has external oil and coolant lines, which with a little bit of damage easily leak (and in case of P-51s, could be stopped instantly by a well-placed bullet to the oil cooler). The Griffin on the other hand redesigned most of these coolant and oil lines so they ran within the block and weren't as exposed. Not only did it offer some advantages in cooling etc, but increased the survivability of the engine.

On the P-39/63, consider where the engine is placed. It is behind the cockpit. Most critical engine hits I've experienced tend to occur from head-on passes or from attacking bombers (who are aiming in front of you). Probably the reason you don't see as many engine failures in the P-39  is that the engine is hit less often than you expect (and also, Allison engines were hardy machines, particularly compared the crappy motors built in tractor factories they were throwing in Russian planes). Still have seen on a few occasions P-39s engines die and once myself have cooked the engine in it.
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Mabroc

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Re: Engine durability & structural integrity after combat damage
« Reply #4 on: August 10, 2011, 11:57:16 AM »

Hi guys, glad that many think similar to me in the damage aspect.

Pursuivant: according to 4.10 readme and some tests i did, if you pull too much G, you damage the airplane, if you damage it enough, it will break a wing. If you manage to fly level again, but pull another high G maneuver the plane will flip over easier or be more twitchy to fly now and start to be damaged (the structure) more sooner. So you got a decreased flight envelope because of G stress. Each plane is different and can take more or less G on certain maneuvers, Fw-190 and Me-262 dive like banshees and can turn at very high speed if you pull carefully, pull too much and they will break away, Spits are weaker for example.

SAS~Anto:
I fly at the WoP servers all the weekends, always BLUE since almost 2 years now. I know what I saying, I combat those P-39 regularly and I try to shot always from engine nose to mid fuselage, more chance to kill the engine or pilot that way. The engine of the P-39 is easy to hit that way from above or below and even from 6 o clock. And I hit it, and it leaks dark grey stuff, I´m think is glycol, and the plane just keep fighting for more than 5m without lack of power. Even when smoking from the engine the plane fight for more than 5m perfectly fine!!! And even with big holes on the wings the plane keep stables high AoA combat maneuvers at low speed trying to make me overshoot and get a 37mm on my neck. I remember the P-39 of the original Il-2, you went below 300kmh and you were stalling like mad.

As I said, I only noticed this on P-39/63, LaGG`s and Yak`s (this those not confirmed on 4.10 by me or anyone, Im saying from previous versions).

But going back to the combat damage making a plane very weak, lowering it´s G strength so a dive passing 400khm or a 5G pull of the stick would break the tail section or the wing (depending where is the damage of course) It´s that something feasible?? The game already show when you got you wing full of holes or your tail fuselage section, just before the rudder sometimes you see only very little metal and all holes, that should come off just by flying level and looking at it. I think that would make the pilots fly with a lot more  care for the plane and when damage try to bug off immediately, just fighting while escaping because they know the plane will break any minute doing that, so they will try to fly with another teammate always, to cover is possible escape.





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Mabroc

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Re: Engine durability & structural integrity after combat damage
« Reply #5 on: September 26, 2011, 08:20:28 AM »

---- BUMP -----
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razor1uk

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Re: Engine durability & structural integrity after combat damage
« Reply #6 on: September 26, 2011, 09:24:45 AM »

  With regard to post damaged engines of suspect A/C types, what are the their (additional) sizes of oil and coolant reservoirs/capacities that are above normal running/crusing needs?
  Remember that within the last 10 years much more infor has been found and declassified, than when Oleg & 1C first put this together.
--------------------- The Hypothesis blah blah blurb ---------------------
  For example, Canadian (& Austrailian/CW-RAF/PTO) Blenhiems known as 'Bollingbrookes' had much bigger oil tanks and so bigger more curvey upper nacelles/naclaces/fairings to cover them (and on one side, housed a dingy pack and extra winter survival gear).
  So that if with an oil leak, the aircraft could fly further across the terrain of Canada before running out of oil for that engine - giving it and the crew, a greater chance of making it to more inhabited areas, and/or being clloser to being rescued.
  While the European based operators of Blenhiem based A/C didn't need so much such these additional considerations for the extra; wieghts, aerodynamic lift vs.drag & speed reductions and survivabilities as they already had the Blenhiem itself - although naval patrol aircraft might/were/IDK have the same mods for maritime partol work/safety etc.

  With regards Soviet A/C (and in someway related to the similar differing US terrains and operational distances), they sort of ended up with both as well, as initially most of the production was close to the front, before being moved further away, from the front, leading to having to fly newly made aircraft across even more remotely inhabited land than earlier in their war to get to operational units.

  This leads to now for those wish changes or to corroberate what is to locate and find relevant info on the specifically affected A/C types, their era/year of production/manufacture and the possibly too the factories locations.
  This sounds more difficult allready yes?, but it easier than I can hear the collective sighing begining as you get this far in the posting.
  What is difficult is the time spent looking for the relevant and corroberating info from amongst the info available at aeronautical/historical sites around the globe in our respective languages and info sourcing nationalistic restrictions.

  But collectively this will not take near as long as some of you are probably already thinking, as snodoubt some of us are remembering some sites &/or info we chanced upon. So without further ado, lets slip the dogs of recon, and hunt my friends, learn more for interest, curiousity and knowledge.

  Disclaimer; I could be wrong about it or all, and I claim that right haha, I have skipped and simplified some/much to keep it short *Editor; Really you did...? could've fooled me..* and hopefully semi readable & understandable.
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Schwieger

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Re: Engine durability & structural integrity after combat damage
« Reply #7 on: September 26, 2011, 02:32:10 PM »

I made this post on the UP forum, 30 views no reply yet:

http://ultrapack.tuttovola.org/index.php/topic,4740.msg44366.html#msg44366

Hello gentlemen, I have a humble request for the DM of the in-line engines of Russian fighters and P-39/P-63 (what a coincidence! they use those too!). As all we know, in the bf-109, Spitfire, P-51, etc when you get hit on the engine and it starts to leak oil and/or glycol the engine will overheat by lack of cooling sooner or later (sooner at more high RPM´s), you have to disengage and run if possible, but you will be gliding soon enough (5-10m).

The Il-2 have the same real issue if you hit it on the big oil cooler on the belly. But the damn P-39/63 can fly all day long leaking, they don´t lost power during the fight, I have been fighting them online sometimes more than 10m after I get some hits on them, and they continue to fight without problems, climbing, running, turning hard, etc. That was applied to the LaGG´s, and Yak´s too, but I don´t usually met them online so I not so sure, I should run some offline test, so forgive me if I wrong.

By the way, the La-5 are pretty though with the delta wood construction (maybe too much?) but the Yak´s are only a little weaker, not by much. If Im not mistaken (correct me if Im wrong please) the soviets wanted to make a very light combat fighter interceptor so the Yak-1/3 (very light) and Yak 7/9 (more normal weight and endurance and range) were constructed like a zero, less possible weight so they have great performance. So a 20mm hit that a Spitfire or La-5 could withstand would make more damage and weaken the structural integrity much more on the Yak. I don´t see that on the game, which leads to my next request....

The game seems to lack structural limitation after damage (like when we now pull too much G) at almost any case. Tempest and Typhoons for example loose the tail easily with only a couple hits of 20mm, I suspect that its intended because the tail was problematic on that plane at structural level, they needed to reinforce it to withstand combat maneuvers (they usually came off on the first typhoons in dives) so when you weaken that tail section the tail just break, its not the power of your gun, its the plane weak spot so the high structural pressure there brake it when the strength is lower. So I suppose they put very little HIT POINTS there to mimic a weak structural point. But the real limitation on amount of G you can pull without breaking that wing full of holes, loose your perforated tail or elevator is not there really.

I remember fondly the ¨Red Baron II/3D¨ game, when you got some damage into the plane it would squeal and scream more easily (wood creaking, canvas tensing) and you could not make the same maneuvers than before without loosing a wing. And when you came to land, the people on the ground seeing your damaged plane coming back would send the fire truck to the ¨runway¨ in your general direction, the ambulance too when you got wounded if Im not mistaked, because IT WAS 13 YEARS AGO!!!!

Im not a modder, and the game already is a big improvement with UP 3.0, but could be it possible to add combat structural failure?? I mean, we have the damage system there, and now the G stress system too, we only need  to combine those too. You have a very big hole on your wing, you try a hard pull or roll and it will came off, more easily to happen in a Fw-190 for example than in a Spit (rolling hard) because of the high roll speed. Im tired of seeing Russian and Allied planes full of big holes doing perfectly controlled tight maneuvers, like their planes were almost intact. I can barely fly straight in a damaged Fw-190 or Bf-109 (I mean with big holes on the wings, not the little MG holes)

Any input or discussion is welcome!!!

With regards to some of the Allied planes (American ones specifically since I generally find flying Spits and what not brings about bad habits), using trim can help immensely -- making a nearly unflyable plane flyable.
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razor1uk

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Re: Engine durability & structural integrity after combat damage
« Reply #8 on: September 26, 2011, 03:24:01 PM »

I second you on that Schwieger, and add that you can  trim a flyable plane to being very quirky and wierdly performing too :)
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Eexhaton

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Re: Engine durability & structural integrity after combat damage
« Reply #9 on: September 27, 2011, 03:02:19 AM »

Honestly; IL2's DM's have been quite fubar in some directions since the very first day it came out.

Would love to see it fixed/evened out a bit
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Mabroc

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Re: Engine durability & structural integrity after combat damage
« Reply #10 on: September 27, 2011, 10:53:31 AM »

OK guys, after 90m of searching, quick resume:

OIL (pilot manual) 9.4 gallons (35.58 Litres) for the P-39 L/K
P-39Q 8.2 US Gallons (31.04 Litres)
P-63 used the same engine (more advanced model only) and similar airframe, couldnt get the manual but from all the warbirds I found OIL tank info, they were pretty much equal size, even the P-38 had a similar sized tank for each engine to the Spit or Mustang

For comparison:
The Spitfire XIV, without a long-range tank, carries 110 gallons of fuel and 9 US gallons of oil.

Bf-109G2 One light-metal oil tank, type NKF. Oil capacity 8.1 gallons (30.66 Litres) with an additional air space of 1.3 gallons.

The Mustang III with maximum fuel load has between 1.5 and 1.75 the range of a Spitfire IX with maximum fuel load. The fuel and oil capacities are 154 gallons and 11.2 gallons respectively, as opposed to 85 gallons 7.5 gallons of the Spitfire IX, both without long-range tanks
NOTE: PROBABLY IMPERIAL GALLONS BECAUSE 7.5 Imperial gallons = 9.00712816 US gallons

SOURCES:
http://www.ww2aircraft.net/forum/technical-requests/spitfire-viii-manual-info-10838.html
http://www.ww2aircraft.net/forum/other-mechanical-systems-tech/p-39-airacobra-pilots-flight-operating-instructions-20503.html
http://www.kurfurst.org/Tactical_trials/109G2_britg2trop/MET-109Gtrop_WdimPerf.html
http://www.wwiiaircraftperformance.org/mustang/mustang-tactical.html

So.....can we get a ending to the "Highlander" Allison engines now???  By the way, the oil tank on the P-39 is behind the engine, close to the tail, so when you get a 6 o clock shot at them that is the first thing to get screwed.

AND REMEMBER GUYS THAT BESIDES THAT "BUG" I WAS WONDERING ABOUT A "COMBAT DAMAGE REDUCING G STRESS ENVELOPE LIMIT" MOD

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Schwieger

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Re: Engine durability & structural integrity after combat damage
« Reply #11 on: September 27, 2011, 02:31:01 PM »


AND REMEMBER GUYS THAT BESIDES THAT "BUG" I WAS WONDERING ABOUT A "COMBAT DAMAGE REDUCING G STRESS ENVELOPE LIMIT" MOD

This is really needed.  Should not be pulling high g maneuvers with giant holes in your wings... well not successfully anyways, lmao
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