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How do you determine firing arc of hull mounted weapons?

1. First is the firing arc 45 degrees EACH direction meaning a total arc of 90 degrees (vertical and horizontal) or 22.5 degrees EACH direction for a total arc of 45 degrees (vertical and horizontal)
2. Is vertical firing arc even used? This seems like a pain to determine.
3. How do you easily determine a 45 degree or 90 degree arc (which ever way is correct) IE is there a tool or easy way to determine this?

This is EXPLICITELY answered on page 72 of the main rulebook.
In short, 45° total on either axis.
No official tools to determine this as far as I know, there might be some out there but I don't remember hearing of any.

22.5* Either side of centreline yields a 45* arc.

So up/down/left/right - 22.5* either way.

There are templates available that will allow you to do the gauging of angles. Line up corner to corner diagonal on a square and it will show you 45*

 chromedog wrote:
22.5* Either side of centreline yields a 45* arc.

So up/down/left/right - 22.5* either way.

There are templates available that will allow you to do the gauging of angles. Line up corner to corner diagonal on a square and it will show you 45*

Thanks on the square idea, that seems to work well. Ouch on the firing arc of 45 degrees that seems very limiting for hull mounted weapons. Does everyone actually play with that limiting arc, especially for the vertical arc?

What type of mounting are missiles considered?

Hull mounted, they can't pivot at all on the models I know

This came up a few months ago, and it was pretty well-determined that it kind of depends on how the model looks, but, IIRC, it was determined to be a 45 degree arc forward, as most of the sponsons have some bit or another that prevents them from pointing directly perpendicular to the line of the hull, and cannot turn to fire to the rear of the vehicle.

The firing arc should apply to each sponson separately, as your left-side sponson is not going to be able to shoot something on the right side of the vehicle, or vice versa, but having a 45 degree arc of fire on that side of the vehicle makes more sense. Your sponsons, basically, use the hull as the centerline, but cannot shoot through itself.

We had a (very badly done, admittedly) picture... can't find it at the moment though.

 Psienesis wrote:
This came up a few months ago, and it was pretty well-determined that it kind of depends on how the model looks, but, IIRC, it was determined to be a 45 degree arc forward, as most of the sponsons have some bit or another that prevents them from pointing directly perpendicular to the line of the hull, and cannot turn to fire to the rear of the vehicle.

The firing arc should apply to each sponson separately, as your left-side sponson is not going to be able to shoot something on the right side of the vehicle, or vice versa, but having a 45 degree arc of fire on that side of the vehicle makes more sense. Your sponsons, basically, use the hull as the centerline, but cannot shoot through itself.

We had a (very badly done, admittedly) picture... can't find it at the moment though.

Sponsons are not hull mounted. Their arc is determined by how far they can actually pivot.

Yeah, that's what I'm saying. Here, I slapped this together in, like, thirty seconds for illustrative purposes.



Your left-side sponson cannot turn inward to the right, just as the right-side sponson cannot turn to the left, so your 45 degree arcs need to assume that the base line is the hull, and the weapons arc away from the hull.

Except that its not 45 degrees if they can turn out further from the hull. I believe on a Land Raider the sponsons can turn at least 90 degrees perpendicular to the hull, if not further.

I know, like I said, this was done in 30 seconds in MS Paint, which doesn't have a built-in protractor. It's for illustrative purposes only, to show that if you're going to give a weapon a 45* firing arc, you can't have half that arc pointing through the hull...

... and that's pretty damn close to 45 degrees anyway. 90 degrees is an L.

... as far as the physical properties of the weapon on the model, it depends on the model.. in the one pictured, that bit that sticks out the back of the outer-most lascannon is under the armor plate (not visible in top-down view the pic is taken from) and hits the hull if you have your weapons not perma-glued in place. This isn't true of all weapons and all models, though... but if the firing arc GW gives us says 45 (or 60 or 30 or whatever it tells us for a given vehicle) degrees, then you're not allowed to turn the cannon perpendicular to the hull anyway, as that'd be a 90* firing arc (unless, of course, it says "these sponsons offer a 90 degree firing arc"... though I think it's only certain turreted weapons that give you that.).

The point is that sponson-mounted weapons have a completely different rule than hull-mounted weapons.

You might have wanted to show the heavy bolter's arc instead, because (on the 2 others variants at least) land raider sponsons can pivot to be perpendicular to the hull.

The green lines are the true arcs for the sponsons on a Land Raider.