20mm cannon ..... just saying

[IRRE_Centx]

Yes, the barrel should be tougher then the thin alu on the wings or fuselage.

 

Not necessary!

 

Generally speaking steel is more "breakable" than aluminum, less resistant to fracture and impact (depending on the grades/alloys of course, some high impact resistance steel alloys exist... but they don't use it for oil barils, too expensive ).

Aluminum is more elastic and deformable, so it can endure higher deformation before breaking, whic induces better impact resistance

 

I checked oil barrels are usually 0,9mm thick in the middle part, so really thin. Didn't find the exact alloy but I guess it can be found somewhere.

 

I don't know which alloy/thickness they used for the Pe-2 wings, if somebody has the alloy/thickness I'm material engineer IRL so I can have access to a lot of data/properties, could be interesting to check by curiosity!

Edited November 7, 2016 by -IRRE-Centx

[=362nd_FS=Hiromachi]

Reminds me of the classic (and legit) discussions about the neutered.50 cals in the old sim. Good times.

We will get there, dont worry. We will have threads about Zeros not burning or burning too much, about .50 cals not quickly enough disposing other aircraft. Internet runs in circles, so we will get there soon enough

 

 

 

I don't know which alloy/thickness they used for the Pe-2 wings

If they were made from metal than I'm 99% sure that would be  2024 aluminium alloy, also called back then Alclad 24ST. But I think you are trying to pull way too much out of this one, its just an empty barrel. To compare it to a wing structure with spars, ribs and rivets ... its completely different story. 

[216th_Jordan]

 

Generally speaking steel is more "breakable" than aluminum, less resistant to fracture and impact (depending on the grades/alloys of course, some high impact resistance steel alloys exist... but they don't use it for oil barils, too expensive ).

Aluminum is more elastic and deformable, so it can endure higher deformation before breaking, whic induces better impact resistance

 

This is only partly true, while Aluminium is more flexible than steel it also has a quite inferior strength and that has a big effect when it comes to HE rounds. What i read about the Minengeschoss was that what was really dangerous about it was the second round coming through a hole the first round punched into the plane, leading to a much higher explosive effect. (and that might be an effect very hard to model)

 

The pe-2s fuselage is very strong, maybe a bit too strong (but I don't know its properties nor am I too much into the matter of ammunition). But outwards of the engines you can quickly snap off a wing with some well placed shots, between the fuselage and the both engines the wing is very well supported and not the best place to place rounds (only if very close to merge point of wing and fuselage). The cockpit is also quite vulnerable, you just need to hit it.

Edited November 7, 2016 by 216th_Jordan

[IRRE_Centx]

If they were made from metal than I'm 99% sure that would be  2024 aluminium alloy, also called back then Alclad 24ST. But I think you are trying to pull way too much out of this one, its just an empty barrel. To compare it to a wing structure with spars, ribs and rivets ... its completely different story. 

 

Actually this triggered my curiosity, if I can check I will!

(and if I have some free time to do it of course :D)