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Grenades travel very long distances when thrown from moving helicopter
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Description

Grenades seem to travel too far when thrown from a moving helicopter. They appear to travel several hundred meters when thrown which is weird. One would think that a grenade would have enough mass to travel forward a short distance and then drop to the ground in an arc pattern. This is not what seems to happen.

Details

Legacy ID
3192935564
Severity
None
Resolution
Open
Reproducibility
Always
Category
Game Physics
Steps To Reproduce

Get in a helicopter piloted by someone else. While moving at high speeds, throw a smoke grenade and see how far it travels.

Event Timeline

BlazinOne edited Steps To Reproduce. (Show Details)Jan 4 2016, 2:52 AM
BlazinOne set Category to Game Physics.
BlazinOne set Reproducibility to Always.
BlazinOne set Severity to None.
BlazinOne set Resolution to Open.
BlazinOne set Legacy ID to 3192935564.May 8 2016, 1:25 PM
Koala added a subscriber: Koala.May 8 2016, 1:25 PM
Koala added a comment.Jan 4 2016, 1:02 PM

What do you mean with "They appear to travel several hundred meters when thrown which is weird."?

If you drop a grenade or stone out of a moving vehicle, it will fall down but it will still fly into the direction you were moving.

That means in theory without air resistance:

If you fly with 100 km/h in a height of 100 meters, the dropped grenade or stone will travel 125,42 meter until impact.

If you fly higher, for example 200m, it will travel 177,38 meter until impact.

With air resistance it wouldn't be so far but still over 100 (or 150) meter.

You were speaking of high speeds so the travel distances would be much higher.

That is not magic, these are physical laws.

The bug I'm reporting is that the distance seems too far - even when you account for your fancy "physics".

In other words, it does not appear as though wind resistance is being accounted for. It feels as though the grenade is being thrown inside a vacuum. It travels in a straight line for the most part and travels and excessive distance when thrown.

Granted, I've never thrown a grenade from a helicopter moving at 90km/hr but I wager you haven't either! It's a bug.

Koala added a comment.Jan 4 2016, 6:08 PM

Accounting to the "fancy" physics I can tell you, that you are right. There seems to be a big issue with the game ballistics.

I have tested the game physics in the editor with the tracer function (BIS_fnc_traceBullets) in combination with a MH-9 hummingbird, a passenger (in firing from vehilce position) and a soldier on the ground (spectator for measuring distances).

That MH-9 traveled with exactly 100 km/h (command: chopper limitspeed 100) in 100 meters height (command: chopper flyinheight 100).
I threw a grenade nearly horizontally out of the MH-9 (90 degrees from the traveling direction).
The grenade traveled a distance of nearly 175 meters until the impact. These are nearly 50 meters more than calculated (and don't forget, it was calculated without air resistance before).

After that, I tested the same procedure again with exactly 200km/h in 100 meters height. The result became ridiculus: The grenade traveled 335 meters (calculated 177,38 meters without air resistance).

The visible ballistic trajectory became a straight line but the smoke trail was still a curve.

I hope you are a little bit familiar with script commands and can reproduce my steps to see it for yourself.

I upvoted your issue.