How can I make a ray that goes from the torso down, and if it hits "Grass" then it prints?

Here's the script that I've gotten together, for some reason it wont work. It's a local script:

	local Player = game.Players.LocalPlayer
while true do
	wait(.1)
	local torso = Player.Character.Torso
	local ray = Ray.new(torso.Position, Vector3.new(0, -10, 0) * 500)
	local part, endPoint = workspace:FindPartOnRay(ray)

	if part.Name == ("Grass") then
		print("GRASS")
	end
end

basically I'm trying to make a ray from the torso, go down from the torso, detect if it hits a block. If the "block" name is "Grass" then print("GRASS"). Thank you for your help.