Difference between 20mm rounds

[Zacherof]

I'm aware to the fact theat all 20mm rounds are explosive rounds, but is there a difference to the lethality or how hard the different rounds are from the different countries?

[morfiend]

  Yes!






   

[Zacherof]

So from what I've read hispanos do the most damage pound for pound then.

[Jabberwock]

Detailed information on WW2 aerial armament can be found here:

http://www.quarry.nildram.co.uk/CannonMGs.htm
http://www.quarry.nildram.co.uk/WW2guneffect.htm
http://www.quarry.nildram.co.uk/ideal.htm
http://www.quarry.nildram.co.uk/BoB.htm

and here

http://users.skynet.be/Emmanuel.Gustin/fgun/fgun-pe.html
http://users.skynet.be/Emmanuel.Gustin/fgun/fgun-am.html
http://users.skynet.be/Emmanuel.Gustin/fgun/fgun-fi.html
http://users.skynet.be/Emmanuel.Gustin/fgun/fgun-fi.html

[SmokinLoon]

So from what I've read hispanos do the most damage pound for pound then.

Indeed.  Below is the damage ranking in lbs for the 20mm's in AH and some examples of aircraft they are in:

RAF: Hispano (Mk's II/V): 4.03 (Spits, Tiff, Mossi, etc, and USN's C-Hog too)
JPN: Type 99 Mk II:        3.85 (NiK2, A6M5)
GER: MG151/20:             3.55 (190's, most 109's)
Sov: B20/ShVAK:           3.47 (La's, Yak 9U)
JPN: Type 99 Mk I:         3.42 A6M2, G4M
JPN: Ho-5:                    3.35 (Ki-45, Ki-61, Ki-67)
GER: MG-FF:                 3.25 (109E-4)

For reference, the Wirblewind does 4.0

These damage values are accurate as of Nov of 2012.

For the heck of it, below are the .50 cal damage as well:

US/UK: .50 cal Browing: 1.17 (US fighters, Spit 14/16)
Soviet: 12.7mm UBS      1.15 (Yaks, I-16)
Japan:  12.7mm Ho-103  0.99 (Ki-84, Ki-61)
Italia:   12.7mm SAFAT   0.95 (C202, C205)
GER:    13mm MG 131     .92 (109G6/14/k4, 190A8/F8/D9, 410)

For reference, the .50 cal Browning from gv's does 1.25 lbs of damage. 

Also, all of the .30 calibers in AH (.303 Brit, 8mm, 7.7mm, 7.62, etc), do between .28 and .31 lbs of damage.  Too close to worry much about separating them out.

This info too was accurate as of Nov 2012.

[tunnelrat]

Loon, is the P-38 armed with a Hispano equivalent as well?

They and the CHog both had Mk3's right?  Which were licensed Hispanos?

[SmokinLoon]

Loon, is the P-38 armed with a Hispano equivalent as well?

They and the CHog both had Mk3's right?  Which were licensed Hispanos?

Yes.  The US 20mm's found in the P38G and P39D (Mk I = M1), P38J/L and P39Q (Mk II = M2), and F4U-1C (Mk II = M2)are licensed copies of the Hispano, the same ammunition was used as well.  In the real deal the US versions were not as reliable for whatever reasons hence the US's hesitation to completely switch to the 20mm over the tried and true (and overly abundant) M2 Browning .50 caliber HMG's for their main aircraft weapons platform.  The usual "not built here" posturing led to the US to be behind in arming its planes with a legit 20mm and later a 30mm cannon for its planes.      

Also, the only aircraft in AH to use the 20mm Hispano Mk V's is the Tempest, without digging I believe the cartridge is the exact same but the barrel length is shorter and rate of fire is increased over the 20mm Hispano Mk II.  I believe the only difference we "need" to worry about (if anything at all) is the differences in trajectory due to a slightly lower velocity.  That is something I'll have to look up to be sure though.  If there is any difference I certainly cant tell.    

[Krusty]

The explosive damage is different, yes, but more so is the ballistics. How flat does it fly, how long does it take to get to target, etc.... Hispanos are lazers, MG/FF are spuds, to take it to extremes.

For the most part they still go "boom" when they hit. Some are just easier to hit with than others.

[SmokinLoon]

The explosive damage is different, yes, but more so is the ballistics. How flat does it fly, how long does it take to get to target, etc.... Hispanos are lazers, MG/FF are spuds, to take it to extremes.

For the most part they still go "boom" when they hit. Some are just easier to hit with than others.

What is the damage difference between the Mk II and Mk V Hispanos?  or are you speaking in general?  I found the Mk II and Mk V to produce the exact same damage.

[Gman]

Does anyone know if the Hispano mounted in the P38 and F4uC had the same barrel length as the ones in the Typhoon and Spitfire in the RAF?  I realize they were license built copies, but were they copied exactly, or were they altered at all for reasons such as fitting the airframes etc?

[Karnak]

Does anyone know if the Hispano mounted in the P38 and F4uC had the same barrel length as the ones in the Typhoon and Spitfire in the RAF?  I realize they were license built copies, but were they copied exactly, or were they altered at all for reasons such as fitting the airframes etc?

Yes, the same as the Hispano Mk II in the Spitfires, Hurricanes, Typhoon and Mosquito, longer than the Hispano Mk V in the Tempest.

[FLOOB]

Doesn't the 12.7mm SAFAT fire HE? I'm surprised it's that weak.

[Noir]

Indeed.  Below is the damage ranking in lbs for the 20mm's in AH and some examples of aircraft they are in:

RAF: Hispano (Mk's II/V): 4.03 (Spits, Tiff, Mossi, etc, and USN's C-Hog too)
JPN: Type 99 Mk II:        3.85 (NiK2, A6M5)
GER: MG151/20:             3.55 (190's, most 109's)
Sov: B20/ShVAK:           3.47 (La's, Yak 9U)
JPN: Type 99 Mk I:         3.42 A6M2, G4M
JPN: Ho-5:                    3.35 (Ki-45, Ki-61, Ki-67)
GER: MG-FF:                 3.25 (109E-4)

For reference, the Wirblewind does 4.0

These damage values are accurate as of Nov of 2012.

For the heck of it, below are the .50 cal damage as well:

US/UK: .50 cal Browing: 1.17 (US fighters, Spit 14/16)
Soviet: 12.7mm UBS      1.15 (Yaks, I-16)
Japan:  12.7mm Ho-103  0.99 (Ki-84, Ki-61)
Italia:   12.7mm SAFAT   0.95 (C202, C205)
GER:    13mm MG 131     .92 (109G6/14/k4, 190A8/F8/D9, 410)

For reference, the .50 cal Browning from gv's does 1.25 lbs of damage. 

Also, all of the .30 calibers in AH (.303 Brit, 8mm, 7.7mm, 7.62, etc), do between .28 and .31 lbs of damage.  Too close to worry much about separating them out.

This info too was accurate as of Nov 2012.

does that take ROF into account?

[Lusche]

does that take ROF into account?

No, that's per round.

[MrRiplEy[H]]

So from what I've read hispanos do the most damage pound for pound then.

Hispanos were prone to jamming if they were fired under G-stress. The pilots were scared of it and many times opted for mg:s instead of cannons. This isn't modeled in AH so they're unrealistically effective currently.