Project Reality Forums

Jonny wrote:Whats your best estimate of the speed of an L85A2 (M855) round at 450m, that will either solve it a little or make it worse.

The rifle is zeroed at 328 yards which is equal to 300 meters.
450 meters converts to 492.126 yards. Being that 500 yards in the above info is the closest thing to 492 yards, I would say it would be about 1905 Feet per second.

Also someone posted earlier that during a test session the bullets IN GAME were striking the ground at around 800 meters. Well considering that the in game player model is 2 meters tall (6 feet 6 1/2 inches) or 78.74 inches. If the rifle were shouldered and fired with the barrel held level with and parallel to the ground you can see that the bullets will hit the ground even before the 800 meter mark. Just some food for thought. Keep up the good work fellas.

Hope that helps
R

we have a ballistics calculator that can find all the values, but more info is always welcome.

zangoo wrote:we have a ballistics calculator that can find all the values, but more info is always welcome.

Cool. Which program are you using?

I have used several over the years. Some good, some not so good. Most all of them will provide the basic info. Some are limited however, in that they won't allow you to plug in variables.

mosquill has been using this

Translated version of http://www.ada.ru/guns/ballistic/calc/

it is translated, i was using it so we would have the same calculator, but if you can find a better one that would be so nice.

I will see what I can dig up. Most of the ones I've used in the past charge a small fee. Something like 20 or 30 USD. I'll see what I find in the Freeware line instead.

R

Update: Try this one for starters.

Open Load

Rico11b wrote:

Umm.. Why is m855's bc=0.353? It's 0.304 in our sheet.

Oh and thanks for the list of bc's and the calculator.

[R-CON]Mosquill wrote:Umm.. Why is m855's bc=0.353? It's 0.304 in our sheet.

Oh and thanks for the list of bc's and the calculator.

You are correct. It is supposed to be .304. That change happens when the software calculates a new "Adjusted" BC for temp and relative humidity levels.

Keep in mind guys that it won't be fair to use the "standard day" atmospheric conditions since the "standard day" is 59 F, and humidity is at .78%. Most of these maps are set in an Arid desert region where the temps are a lot higher, and the humidity levels are a lot lower. Just more food for thought

R

Rico11b wrote:You are correct. It is supposed to be .304. That change happens when the software calculates a new "Adjusted" BC for temp and relative humidity levels.

Keep in mind guys that it won't be fair to use the "standard day" atmospheric conditions since the "standard day" is 59 F, and humidity is at .78%. Most of these maps are set in an Arid desert region where the temps are a lot higher, and the humidity levels are a lot lower. Just more food for thought

R

Hmm.. I ignored humidity/temperature because I though it doesn't matter that much. Guess it actually does.

Ok thanks for your help.

[R-CON]Mosquill wrote:Hmm.. I ignored humidity/temperature because I though it doesn't matter that much. Guess it actually does.

Ok thanks for your help.

I suppose you could ignore if you really wanted to, but since you guys are working so hard to get it right, maybe it is something to think about.

I'd like to "recommend" (if I may) using a temp of say 98 F, and .26% humidity. Now I know that the day time temps get a hell of a lot hotter than that, but you could use it as the "average" temp and humidity level during the summers months from Late May to Early September. Relative humidity starts at about .35 to .40 % in the early morning hours and is down into the mid to low teens by the afternoon hours. I figure .26 % humidity would be a decent average to use.

I know the temps can drop into the low 40s to high 30s during the night, but since we don't currently have any night time maps it won't matter

R

edit:i am stupid and i dont read posts some times, i read your post through and i say that we should use that standerd temp like you suggested.

zangoo wrote:edit:i am stupid and i dont read posts some times, i read your post through and i say that we should use that standerd temp like you suggested.

Huh?

I'm kind of slow, and not real sure if you were addressing me or someone else here

Are you saying to use the "standard day" of 59 F/ .78 % humidity, or the temp and humidity "averages" I suggested? Which were 98 F/.26 % relative humidity. I'm sort of confused now hehe.

R



Edit: I went back re-read your post also. More slowly this time. I think I see what you are saying. Hehe again.

Oh yeah, I remember this from the AA forums, an Army guy said that past 600m any and all standard 5.56 rounds don't do much at all, and the M4 can reach to about as far as the M16 can.

That would certainly be an awesome effect

I think that should stay in Max Payne.

Or in Sniper Elite. This would be a great effect for a movie but for PR its just a little bit to Hollywood.

Jonny wrote:Anyone interested:

some one on my vent server came up with the idea of having the camera follow the bullets fired from sniper rifles. The typical time of flight for these is very short, so no effective recon could be done. This would allow you to see where your shot is relative your target and do some sort of recon.

Even though this in itself would be unrealistic the effects would be make the sniper fulfil its role very effectively.

What do you lot think about this?

afaik it is not possible, there is code to use the projectile camera for vehicles but not handheld weapons. i belive that some one tried this in the battlefield 2 single player fourms and could not find a way to use the projectile camera.


also jonny is it possible to use the ballistics calculator backwards, so instead of finding the trajectory with mass and muzzle velocity, use the trajectory to find mass and muzzle velocity?

ok i have been thinking, if we are doing the ballistics why not try to make a player model that would be close to real life. i mean, we could add vital organs, body armour with damage modifiers, bullet penetration and deviation after penitration, so many other great features that would really make the ballistics in pr closer to pr.

first off, can we have more then 1 player model, if this is not possible there would have to be a work around, cus not all counrtys have body armour and if they do i am thinking it is not all in the same places. also talking about body armour, what type of body armour does the us issue its troops, is there diffrent types of body armour for diffrent roles? also what type of round would the body armour stop and at what distances?

also what organs would need to be included in the model assuming that the number of diffrent parts effect performance?