Custom water drag sometimes flings boat

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#1

i created a buoyancy system for my boat using vector forces for floating up
and a vector force for water drag

i also use a vector force for a motor in the back of the boat which is controlled by the rudder’s turn
see video for better explanation of the issue

middle line is the drag force
back line is the motor force

code:

-- self.linearDrag = 7
local drag = hullBase.AssemblyMass * (-hullBase.AssemblyLinearVelocity * self.linearDrag)
self.dragForce.Force = drag

code for motor:

local speed = model.HullBase.AssemblyMass * (settings.maxSpeed * sailSpeedPercentage)

if model:FindFirstChild("Rudder") then
	local rudder = model.Rudder
	if not rudder:FindFirstChild("Motor") then return end
	local motor = rudder.Motor
	
	local hullBase = model.HullBase
	local waterPosition = WaterService:GetWaveHeight(model.HullBase.Position, model.HullBase)
	
	local upVector = hullBase.CFrame.UpVector
	local pos = hullBase.Position
	if pos.Y > (pos + upVector).Y then
		motor.VectorForce.Force = Vector3.new()
		return 
	end
	
	if waterPosition + 10 < hullBase.Position.Y - hullBase.Size.Y / 2 then 
		motor.VectorForce.Force = Vector3.new()
		return 
	end
	
	motor.VectorForce.Force = Vector3.new(speed, 0, 0)
end

is there any other way to simulate water drag without it flinging the boat

#2

solved the issue using more realistic water drag