Can anyone help me with this formula or script? Answers are appriciated

Im trying to make a spaceship everything works good besides the fact that the speed slows down if i push the nose of my spaceship up or down. I Think it has to do with the formula im using to determine the velocity of the bodyvelocity, this is the script:

local Ship = script.Parent
local primary = Ship:WaitForChild("Primary")
local seat = Ship:WaitForChild("VehicleSeat")
local BV = primary:WaitForChild("BodyVelocity")
local Speed = Ship:WaitForChild("CurrentSpeed")
local LookPart = Ship:WaitForChild("LookPart")

local Hoover = Ship:WaitForChild("Hoover")
Hoover.Value = true

local BP = primary:WaitForChild("BodyPosition")

while wait() do


    BV.Velocity = LookPart.CFrame.lookVector * Speed.Value  



    if Hoover.Value == false and Speed.Value >= 1 then

        BP.Position = seat.Position

    end


end