jetpack

ezweld = function(p, a, b, cf)
    local weld = Instance.new("Weld",p)
    weld.Part0 = a
    weld.Part1 = b
    weld.C0 = cf
    return weld
end

plr = owner
char = plr.Character
root = char.HumanoidRootPart
hum = char.Humanoid
hold = false

local bv = Instance.new("BodyVelocity",nil)

local remote = Instance.new("RemoteEvent",char)
remote.Name = "remote"

local jet = Instance.new("Part",char)
local fire = Instance.new("Fire",nil)
fire.Enabled = true

if char:FindFirstChild("Torso") then
jet.CanCollide = false
jet.Size = Vector3.new(5, 3, 1)
local mesh = Instance.new("SpecialMesh",jet)
mesh.MeshId = "http://www.roblox.com/asset/?id=30643517"
mesh.TextureId = "http://www.roblox.com/asset/?id=30643565"
local weld = ezweld(char, jet, char.Torso, CFrame.new(0, -0.25, -0.75))
elseif char:FindFirstChild("UpperTorso") then
jet.CanCollide = false
jet.Size = Vector3.new(5, 3, 1)
local mesh = Instance.new("SpecialMesh",jet)
mesh.MeshId = "http://www.roblox.com/asset/?id=30643517"
mesh.TextureId = "http://www.roblox.com/asset/?id=30643565"
local weld = ezweld(char, jet, char.UpperTorso, CFrame.new(0, 0, -0.75))
end

function lol(Key)
	if Key == "flighton" then
		hold = true
		repeat
			wait()
			fire.Parent = jet
			bv.Parent = root
			bv.MaxForce = Vector3.new(0, math.huge, 0)
			bv.Velocity = Vector3.new(0, 25, 0)
		until hold == false
		fire.Parent = nil
		bv.Parent = nil
	end
	if Key == "flightoff" then
		hold = false
		fire.Parent = nil
	end
end

NLS([[

	plr = owner
	char = plr.Character
	remote = char.remote
	mouse = plr:GetMouse()

	mouse.KeyDown:connect(function(key)
		if key == " " then
			remote:FireServer("flighton")
		end
	end)

	mouse.KeyUp:connect(function(key)
		if key == " " then
			remote:FireServer("flightoff")
		end
	end)

]], char)

remote.OnServerEvent:connect(function(PlayerSendit, Button) lol(Button) end)