Their ammo is mainly ball or AP, they do not have good firepower.
The E-3 109 has 2x 20mms; I should’ve said “a Yak-1”; the A-0 and B-0 He 112s have 20mms; the LaGGs also have three non-2.7s; wait are you listing the planes that don’t have only one 20mm?
The Hurricane Mk IV, it’s 2.0 rip.
That’s not what’s being discussed there, though. What’s being discussed is that a 20mm can also take out engines but it (and HE 12.7mms and other cannons) can do consistent structural damage. Besides, one .50 cal bullet is not comparable to one 20mm in terms of engine damage.
Because having to spray to maybe do anything, taking more time and wasting more energy due to more passes, in airframes that are already worse than the competition in terms of short- and long-term dogfights isn’t good?
HE 12.7mms and cannons can waste ammo spraying people down, can get pilot snipes, and get engine kills, too. It’s just that they can do structural damage consistently.
The following estimates are based on an RE factor of 0.25-0.36 for the powder used in the US incendiary rounds. The values were based on formulations of barium nitrate, potassium chlorate, and aluminum powder in a document somewhere above this, although the two compounds used in US used a magnesium-aluminum alloy/powder. Values of 0.30 and 0.36 were found for the low-potassium-perchlorate solutions, so if the magnesium-aluminum powder enhances the RE factor then it might be greater.
M8 API (0.97g powder): 0.2425g-0.3492g TNTeq
M1 I (2.2g powder): 0.55g-0.792g TNTeq
M23 I (5.8g powder): 1.45g-2.088g TNTeq
Japanese 12.7mm HE (0.6g PETN): 0.996g TNTeq
15mm MG-151 HEF-T: 3.23g TNTeq
ShVak HEF-I: 4.35g TNTeq
ShVak HEF: 5.8g TNTeq
Hispano Mk.II HEI: 9.28g TNTeq
The M1 incendiary rounds should be just short of the Japanese 12.7mm HE rounds and the M23 incendiary rounds should have more than twice the destructive potential of the Japanese 12.7mm HE rounds.
Two rounds of M23 should do comparable damage to a single ShVak HEF-I round (actually better when you consider there is more surface area of two .50 cal explosions than one 20mm explosion due to the inverse square law), and three M23 rounds should be doing comparable damage to a ShVak HEF round.
Although, the incendiary rounds are obviously not doing that currently.
A M2 Browning API-T round is going to enter one side of the fuselage, fly through the entire thing, and do nothing important unless it directly impacts with a module that matters.*
That’s literally what incendiary does, and M23 literally has over TWICE the TNTeq of the 12.7mm HEF rounds.
If that’s the case, then in combination with the TNTeq values I found it seems like 2.7-3.888g TNTeq of flash powder is better than 6.875g TNTeq of Tetryl (RE factor of 1.25) plus 0.55g-0.792g of flash powder. That would give flash powder a damage ratio (in terms of effective damage per gram of TNTeq) of 1.972:1 to 2.75:1 when compared to traditional HE.
In that scenario, M23 would have a TNTeq (to structures specifically) of 4.12g to 5.742g - nearly to just better than some 20mms.