Fuel leaks when hit by rifle caliber MGs

[Venturi]

Hello, just a piece of constructive criticism regarding fuel system damage.

 

1. Many planes were fitted with self-sealing fuel tanks which were rubberized to automatically seal punctures by rifle caliber bullets. There was a weight penalty for having this option included and it was fairly stiff, depending on how many tanks there were in a plane. However, in the sim, if one gets hit by RCMG bullets in a plane with this feature (such as the P-39L), then a leak ensures no matter how many times one is hit (even once is enough).

 

2. Fuel continues to leak even after the tank(s) which are hit are empty.

 

3. A hit in a tank which has already been emptied, will drain those tanks which are not yet empty.

 

Thank you.

[Mitthrawnuruodo]

Fuel system improvements and drop tanks were scheduled for the next development cycle in the November announcement.

 

Of course, we don't know exactly what that means.

[ShamrockOneFive]

1 hour ago, Venturi said:

Hello, just a piece of constructive criticism regarding fuel system damage.

 

1. Many planes were fitted with self-sealing fuel tanks which were rubberized to automatically seal punctures by rifle caliber bullets. There was a weight penalty for having this option included and it was fairly stiff, depending on how many tanks there were in a plane. However, in the sim, if one gets hit by RCMG bullets in a plane with this feature (such as the P-39L), then a leak ensures no matter how many times one is hit (even once is enough).

 

2. Fuel continues to leak even after the tank(s) which are hit are empty.

 

3. A hit in a tank which has already been emptied, will drain those tanks which are not yet empty.

 

Thank you.

 

On point 1, IL-2: BoX aircraft do have self sealing tanks when appropriate but the interesting thing about self sealing tanks is that they don't just seal up right away. It takes some time for them to seal.

 

The other two are definitely problems. We know that the team has on their roadmap for better fuel tank management and drop tanks. I'd imagine improvements in the damage modeling in terms of fuel tanks draining when they shouldn't will be sorted out when they work on the other items.

[Venturi]

1 hour ago, raaaid said:

well by your name you should know thats realistic as long as you dont lock the fluid transit between the two containers

I doubt the Venturi effect would generate enough pressure differential to be sufficient to overcome gravity and flow resistance, especially considering the tanks had venting anyways to prevent pressure lock when fuel was withdrawn. But, good thought.

 

1 hour ago, raaaid said:

maybe your plane doesnt really have self sealing it was too expensive

P-39D onwards had self-sealing fuel tanks. 

10 minutes ago, ShamrockOneFive said:

 

On point 1, IL-2: BoX aircraft do have self sealing tanks when appropriate but the interesting thing about self sealing tanks is that they don't just seal up right away. It takes some time for them to seal.

In IL-2 they never seal.

 

10 minutes ago, ShamrockOneFive said:

The other two are definitely problems. We know that the team has on their roadmap for better fuel tank management and drop tanks. I'd imagine improvements in the damage modeling in terms of fuel tanks draining when they shouldn't will be sorted out when they work on the other items.

Hope so!

[CrazyDuck]

34 minutes ago, ShamrockOneFive said:

 

On point 1, IL-2: BoX aircraft do have self sealing tanks when appropriate but the interesting thing about self sealing tanks is that they don't just seal up right away. It takes some time for them to seal.

 

If (and that's a biiiig if) they seal, they "seal" instantly, never even developing a leak. Once you get a leak, it never seals.

[Wolfram-Harms]

22 minutes ago, CrazyDuck said:

If (and that's a biiiig if) they seal, they "seal" instantly, never even developing a leak. Once you get a leak, it never seals.

 

Hmmm... In WIKI I read that the non-treated rubber layer had to swell from the contact with the fuel.
That sounds to me like there was a certain leakage, before they sealed. Any experts here?

[Venturi]

The German types used fiber swelling. This takes a few seconds but not much longer (similar systems can be used in an ad-hoc way now on cooling systems - with disastrous results later I might add). The fiber absorbs the fluid and swells. American types were rubberized and flowed into the hole, the rubber swelled in a reaction with the fuel and filled the hole. Not even a few seconds were needed. 

43 minutes ago, CrazyDuck said:

 

If (and that's a biiiig if) they seal, they "seal" instantly, never even developing a leak. Once you get a leak, it never seals.

 

I’m not sure why you think they were ineffective? The Japanese certainly suffered from lack of. 

Edited April 30, 2018 by Venturi

[CrazyDuck]

10 hours ago, Wolfram-Harms said:

 

Hmmm... In WIKI I read that the non-treated rubber layer had to swell from the contact with the fuel.
That sounds to me like there was a certain leakage, before they sealed. Any experts here?

Yes, that's how they worked in reality. I was describing in-game behavior. Fuel leaks in the sim never seal after a while.

[Wolfram-Harms]

Ah, okay - yes, that's true - the leakage should stop after some time - at least in some cases.

[migmadmarine]

What aircraft in this sim were equipped with self-sealing fuel tanks? P-39 and what else? 

[Jade_Monkey]

My understanding is that currently they are modeled and not all impacts on fuel tanks will create a leak (due to seal).

 

No, there is no delay modeled afaik.

[Venturi]

On 4/30/2018 at 7:56 AM, thenorm said:

What aircraft in this sim were equipped with self-sealing fuel tanks? P-39 and what else? 

 

DO HAVE:

P40E

P39L

Spit MkV 

Fw190A-3 and A-5

Bf109F4 - G6

Yak-7

La-5 and La-5FN

Mig-3

Pe-2

He-111

Ju-88

Ju-87

HS129B

IL-2

LaGG-3

Bf110 all models

 

DO NOT HAVE:

Bf-109E7 and F2

Yak-1 and -1B

A20B

I-16

Ju-52