30% fuel is 70% fuel vapors. I already showed what happened to a UH-1 fuel tank when the ullage goes off. Huge tanks with lots of empty space and fuel vapors is not a good combination.
Self-sealing fuel tanks is to stop a leak, as once a leak starts. it won’t stop, and to also add structural rigidity to the fuel tank due to ullage detonation and the pressure wave of the round going through the tank. It’s why fuel tanks are all rounded off with no sharp corners.
Thing is, you can only go so far before it gets massive, cumbersome and you lose too much space. The less fuel there is, the more dangerous it becomes as your fueltank becomes a bomb. If I recall, to add self-sealing fuel tanks to the P-38. Nearly 60% of usable fuel space was used to make the tanks self-sealing.
The reason why you’ll see Bf-109s explode in combat footage was highly likely due to the fact they were low on fuel. Flight TWA-800 went down due to an ullage detonation. Again, not every shot should be an instant explosion, but enough to cause catastrophic damage to the fuel tank that the next round should cause massive fuel hemorrhaging
Even with Default belts—which to be fair, if I recall, late-war defaults don’t include ball anymore—you’re still having more at least more than 10 API rounds ripping through the fuel tank, and the incendiary round should be penetrating and doing something too, but again. Gaijin makes incendiary rounds dead rounds.
For one, I’m not showing 5 kills matches where I do everything right that doesn’t illustrate the issue I’m trying to show. From your perspective. Imagine if in Real Shatter 1.0 someone just showed them insta-killing somebody all the time and said “Nope, no problem here. Cannons are fine.” You’d think that’s bull, right?
Another part is literally dice roll and the amount of rounds you put into somebody. It’s why it’s easier for P-47s to light fires, especially on convergence because you’re probably having 20 or so API rounds smack a fuel tank directly. You can still get fires if you put inordinate amounts of rounds into somebody. The problem is that there are many times where what is a passing hit, you actually did decent damage to their fuel tanks but nothing happened, it’s why I check my server replays and there are many times I struck their fuel tank and did nothing.
Again, .50s should be fire starters. It should be just as scary getting grazed by .50s as it should be by 20mm because 1 hit could light you up in the same vein 1 hit by a 20mm could instantly disable you.
It won’t ALWAYS happen, but like cannons where it happens commonly enough you can snap people’s wings off with literally single shots with shells. The same, but with fires, should happen with .50s.
You also need to remember that not all fires are fuel fires. engine fires can be lit even by non API rounds.