How to make an expanding fire effect?

I’m working on the mechanics for a spell that calls for an expanding fire ring. Here’s what I have thus far code wise:


local attach = {}
local angleStep = 3

local part = Instance.new("Part")
part.Shape = Enum.PartType.Block
part.Transparency = 0
part.Anchored = true
part.CanCollide = false
part.Position = Vector3.new(0, 0.5, 0)
part.Size = Vector3.new(1, 1, 1)
part.Parent = game.Workspace

task.wait(10)


local function setOffset(angle, radius)
	local radian = math.rad(angle)
	local x = math.sin(radian) * radius
	local y = part.Position.Y
	local z = math.cos(radian) * radius
	return Vector3.new(x, y, z)
end


for i = 0, 359, angleStep do
	local attachment = Instance.new("Attachment")
	attachment.Position = setOffset(i, 2)
	attachment.Parent = part
	
	local fire = Instance.new("Fire")
	fire.Size = 10
	fire.Heat = 10
	fire.Parent = attachment
	
	table.insert(attach, attachment)
end

for i = 3, 30, 1 do
	task.wait(0.06)
	local angle = 0
	for _, at in ipairs(attach) do
		at.Position = setOffset(angle, i)
		angle += angleStep
	end
end

task.wait(20)
part:Destroy()

As the ring expands to larger distances from the center, the fires spread out from each other. There’s also uneven gaps between the fires. Any suggestions on how to improve this? I have tried setting the gap to 5° and the fires are closer together, but it’s not the wall of fire that I’m trying to achieve.

EDIT: I found some errors in the script and corrected them. The weird gaps have been fixed but the rest of it…any ideas?