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10-03-2003, 10:24 AM

Salute Oleg

I have tested and tested the P-47, and it is clear to me there is an error in how the aircraft's weapons are modelled.

Yes, you can destroy at target, but only at the exact moment when ALL guns converge. Outside of the 'magic' convergence range, the weapons are basically useless, and do very little damage. The bullets impact in a wide pattern, and have no concentrated effect.

They are modelled as if all the 8 guns are spraying a pattern 10 feet wide. Which is not correct.

There should be two concentrated streams of fire coming out of the P-47. Yes, when these two streams converge, they will be more powerful, but even when they are not converging, and a single stream hits a target, they are concentrated.

Each of the wings has firepower equivalent to the armament of a 109F4 or G2. And more tightly grouped.

Please look at this photograph:

http://www.ipmsstockholm.org/photos/detail_p47_08.jpg

There is less distance between the guns on this wing than there is between the guns in the nose of a 109G2.

And the weight of the bullets fired and the power is more than the above mentioned 109.

Yet, we find that a 109 does much more damage.

Please look at this site:

http://www.quarry.nildram.co.uk/WW2guneffect.htm

This is the site of Tony Williams, an acknowledged and published expert in WWII Fighter Aircraft armament.

I will be using his formulas for my calculations.

Single P-47 Wing of four .50 calibre guns:

A .50 calibre Armour Piercing Inciendary bullet weighs 43 grams and can be fired at 13 rounds per second.

Each second, each wing of a P-47 throws 2.236 kilograms of weight at 890 Meters per second for a Momentum factor of 1990.04

Taking into account the High Explosive content of the bullets, which is 2% and using Williams formula, we multiple the effect by 1.2 for a total Power of 2388.05

109G2 nose weapons:

A MG17 bullet weighs 12.89 grams and syncronized, fires at 18 rounds per second.

A MG151/20 bullet weighs either 117 grams for API or 115 grams for High Explosive. (no Minegeschvoss for G2) Typically they were loaded in that order for an average of 116 grams. They fire at 12 rounds per second unsyncronized.

Each second a 109G2 throws .464 kilograms of 7.92mm at 755 meters per second for a Momentum factor of 350.32. There is no HE content in a 7.92 bullet so the Power is 350.22.

Each second a 109G2 throws 1.392 kilograms of 20mm at 720 meters per second for a momentum factor of 1002.24. Multiple this by 1.315, (HE content of API was 3.1, for HE was 3.2) and we have a Power of 1317.94

Total Power 1668.17

Using Williams calculations, each wing of a P-47 is 143% more powerful than the total firepower of a 109G2.

Please adjust the effectiveness of the P-47's weapons.

Thankyou for your patience

RAF74 Buzzsaw

I have tested and tested the P-47, and it is clear to me there is an error in how the aircraft's weapons are modelled.

Yes, you can destroy at target, but only at the exact moment when ALL guns converge. Outside of the 'magic' convergence range, the weapons are basically useless, and do very little damage. The bullets impact in a wide pattern, and have no concentrated effect.

They are modelled as if all the 8 guns are spraying a pattern 10 feet wide. Which is not correct.

There should be two concentrated streams of fire coming out of the P-47. Yes, when these two streams converge, they will be more powerful, but even when they are not converging, and a single stream hits a target, they are concentrated.

Each of the wings has firepower equivalent to the armament of a 109F4 or G2. And more tightly grouped.

Please look at this photograph:

http://www.ipmsstockholm.org/photos/detail_p47_08.jpg

There is less distance between the guns on this wing than there is between the guns in the nose of a 109G2.

And the weight of the bullets fired and the power is more than the above mentioned 109.

Yet, we find that a 109 does much more damage.

Please look at this site:

http://www.quarry.nildram.co.uk/WW2guneffect.htm

This is the site of Tony Williams, an acknowledged and published expert in WWII Fighter Aircraft armament.

I will be using his formulas for my calculations.

Single P-47 Wing of four .50 calibre guns:

A .50 calibre Armour Piercing Inciendary bullet weighs 43 grams and can be fired at 13 rounds per second.

Each second, each wing of a P-47 throws 2.236 kilograms of weight at 890 Meters per second for a Momentum factor of 1990.04

Taking into account the High Explosive content of the bullets, which is 2% and using Williams formula, we multiple the effect by 1.2 for a total Power of 2388.05

109G2 nose weapons:

A MG17 bullet weighs 12.89 grams and syncronized, fires at 18 rounds per second.

A MG151/20 bullet weighs either 117 grams for API or 115 grams for High Explosive. (no Minegeschvoss for G2) Typically they were loaded in that order for an average of 116 grams. They fire at 12 rounds per second unsyncronized.

Each second a 109G2 throws .464 kilograms of 7.92mm at 755 meters per second for a Momentum factor of 350.32. There is no HE content in a 7.92 bullet so the Power is 350.22.

Each second a 109G2 throws 1.392 kilograms of 20mm at 720 meters per second for a momentum factor of 1002.24. Multiple this by 1.315, (HE content of API was 3.1, for HE was 3.2) and we have a Power of 1317.94

Total Power 1668.17

Using Williams calculations, each wing of a P-47 is 143% more powerful than the total firepower of a 109G2.

Please adjust the effectiveness of the P-47's weapons.

Thankyou for your patience

RAF74 Buzzsaw