a simple rule for gunnery range?

[lulu]

More high is your speed approach to the target, more less gunnery convergence must be.

It's right?

 

[B-17]

it sorta makes sense.. do you mean that the fast you are going, the closer the guns will converge?

[Karnak]

More high is your speed approach to the target, more less gunnery convergence must be.

It's right?

 

Not significantly, no.

[lulu]

"it sorta makes sense.. do you mean that the fast you are going, the closer the guns will converge?"

i thought yes


 

[mtnman]

More high is your speed approach to the target, more less gunnery convergence must be.

It's right?

 

I would not agree with this as a "simple rule".

[4Prop]

if you fire on a target that is D400 out...and you are going 500...they will still converge at D400.

if you fire on a target that is D400 out and you are going 200..they will converge at D400.
assuming your convergence is set to 400

it just means you will be closer to your target when they converge and hit

[curry1]

if you fire on a target that is D400 out...and you are going 500...they will still converge at D400.

if you fire on a target that is D400 out and you are going 200..they will converge at D400.
assuming your convergence is set to 400

it just means you will be closer to your target when they converge and hit

This is the way I think it is.  I'm pretty sure I am right too.  Seems to me if your convergence is at D400 out the bullets will ALWAYS cross at D400 out no matter your plane's speed, if that speed is kept constant and you are flying level.


F = bullet speed when leaving your plane using the ground as a reference frame
p= speed of plane
m= muzzle velocity of your bullet

F = p + m

[4Prop]

This is the way I think it is.  I'm pretty sure I am right too.  Seems to me if your convergence is at D400 out the bullets will ALWAYS cross at D400 out no matter your plane's speed, if that speed is kept constant and you are flying level.


F = bullet speed when leaving your plane using the ground as a reference frame
p= speed of plane
m= muzzle velocity of your bullet

F = p + m

no matter what it will always converge at D400 from where ever the position of the plane is and where the bullet leaves the muzzle. thats because at that exact point the bullet starts its "life" its "life" is to converge with the other guns at D400.


so if  is flying at 500 MPH and is aiming at a target D400 (with convergence at D400 of course) those bullets will converge with eachother D400 out from where they left the muzzle.

really all speed has to do with gunnery is how big your window of opportunity is to hit the target as he's passing into your pipper.

[Vinkman]

I think the convergence is a function of speed, assuming no aerodynamic affects.

[hitech]

I think the convergence is a function of speed, assuming no aerodynamic affects.


(Image removed from quote.)

Yes but this is from the point it was fired not from the relative point of the plane.

In the .419 secs of travel time ,the plane traveled. 102 yards. I.E. they still crossed at 400 yards relative to the plane.

______________

With drag taken into account as the plane travels faster the bullets deceleration is greater because it is a function of V^2, hence it takes longer to reach the convergence point. So they will converge at less then 400 yards relative to the plane as your speed increases.

HiTech

[Vinkman]

Yes but this is from the point it was fired not from the relative point of the plane.

In the .419 secs of travel time ,the plane traveled. 102 yards. I.E. they still crossed at 400 yards relative to the plane.

______________

With drag taken into account as the plane travels faster the bullets deceleration is greater because it is a function of V^2, hence it takes longer to reach the convergence point. So they will converge at less then 400 yards relative to the plane as your speed increases.

HiTech

True. Thanks for the calrification.  


Many answered that it 400 "from the point fired, regardless". I just wanted to correct that. I think the original question was for attacking a stationary target from planes at various speeds, so I answered relative to a fixed object. It would matter, but I don't recommend waiting to pull the trigger at 400ydrs if you are travelling at 500mph when pointing at a ground target.  

[Shuffler]

Yes but this is from the point it was fired not from the relative point of the plane.

In the .419 secs of travel time ,the plane traveled. 102 yards. I.E. they still crossed at 400 yards relative to the plane.

______________

With drag taken into account as the plane travels faster the bullets deceleration is greater because it is a function of V^2, hence it takes longer to reach the convergence point. So they will converge at less then 400 yards relative to the plane as your speed increases.

HiTech

So if your going fast enough... you can shoot yourself down 

[curry1]

no matter what it will always converge at D400 from where ever the position of the plane is and where the bullet leaves the muzzle. thats because at that exact point the bullet starts its "life" its "life" is to converge with the other guns at D400.


so if  is flying at 500 MPH and is aiming at a target D400 (with convergence at D400 of course) those bullets will converge with eachother D400 out from where they left the muzzle.

really all speed has to do with gunnery is how big your window of opportunity is to hit the target as he's passing into your pipper.

No they won't cross D400 out from where the left the muzzle.  They with cross D400 out from the muzzle of the gun.  Meaning the speed of the plane is added to the speed of the bullets.

[Vinkman]

Yes but this is from the point it was fired not from the relative point of the plane.

In the .419 secs of travel time ,the plane traveled. 102 yards. I.E. they still crossed at 400 yards relative to the plane.

______________

With drag taken into account as the plane travels faster the bullets deceleration is greater because it is a function of V^2, hence it takes longer to reach the convergence point. So they will converge at less then 400 yards relative to the plane as your speed increases.

HiTech

Another thought on Aerodynamics: I actually wondered if the bullet would "slide" that distance or if Aero forces would cause it to curve onto the path which it is pointing along.

[4Prop]

No they won't cross D400 out from where the left the muzzle.  They with cross D400 out from the muzzle of the gun.  Meaning the speed of the plane is added to the speed of the bullets.

yes. thats what I was saying..I wasnt talking about the muzzle of the landing gear LOL