Fix plane flying horizontally

Help and Feedback Building Support
#1

So my problem is that the plane would fly horizontally. I have checked every part to see if they match every side but couldn’t find anything. I have also tried to disable the propeller but it also didn’t work.

My plane design:

image
image622×579 65.4 KB

The back tail of the plane is tall because that was the only solution I found to lift up the plane.

Video:

You can see the plane flying horizontally when I am not steering.

2 Likes
#2

Actually it’s rolling to the right, not flying horizontally.
Here are some suggestions for trying to troubleshoot and test after each one to see if it makes any difference:
Try removing the propellers entirely.
Keep the propellers on, but weld them to the airframe so they don’t turn at all.
Try rotating one propeller clockwise and the other one counter-clockwise.
It may also be a balance issue. Planes IRL and on Roblox have to be balanced front to back as well as side to side. A plane that has its center of mass too far forward of its center of lift is hard to control. One that has its center of mass too far aft of its center of lift will become very unstable and hard to control.

On another note, real planes use the ailerons on the wing for roll control, not for pitching up and down. They use a control surface called an elevator at the back to push the tail down to increase the angle of the wing compared to the air the plane is flying through and lift up, or to push the tail upwards to decrease the angle of the wing and point the nose down.

This is basically what I was telling you about in your first plane post.

Try this link to learn more about it: https://www.studyaircrafts.com/aircraft-control-surfaces#:~:text=The%20primary%20control%20surfaces%20of,ailerons%2C%20rudder%2C%20and%20elevator.&text=Secondary%20control%20surfaces%20include%20tabs%2C%20flaps%2C%20spoilers%2C%20and%20slats.

1 Like
#3

I have tried all this but it hasn’t fixed my issue. I have checked my plane to see if they are balanced and I don’t see anything causing this and I also tried to counter-clockwise and clockwise but they didn’t help. I also have center of mass enabled on the VectorForce too.

image
image319×787 31.3 KB

Here is the place where you can test.
Plane Fly Test.rbxl (70.8 KB)

#4

I just remade the plane but it still had the same problem. I think the problem is in the script.

Module:

local module = {}

local module = {}

local RunService = game:GetService("RunService")
local UserInputService = game:GetService("UserInputService")

local player = game.Players.LocalPlayer

local model = script.Parent.Parent
local Parts = model:WaitForChild("Parts")
local VehicleSeat = Parts:WaitForChild("VehicleSeat")

local Constraints = model:WaitForChild("Constraints")

local activated = false

local flySpeed = 1000000
local turnSpeed = 1

local steer = 0
local ascend = 0
local throttle = 0

local steerTargetAngle = 30

local propellerSpeed = 100

local accelerateConnection
local decelerateConnection

function module.DisconnectConnection(connection)
	if connection then
		connection:Disconnect()
		connection = nil
	end
end

function module.Propeller(bool)
	for i,v in ipairs(Constraints:GetChildren()) do
		if v:IsA("HingeConstraint") then
			if v.Name == "LeftPropellerHinge" then
				if bool then
					v.AngularVelocity = propellerSpeed
				else
					v.AngularVelocity = 0
				end

			elseif v.Name == "RightPropellerHinge" then
				if bool then
					v.AngularVelocity = -propellerSpeed
				else
					v.AngularVelocity = 0
				end
			end
		end
	end
end

function module.FlyForward()
	for i,v in ipairs(Constraints:GetChildren()) do
		if v:IsA("VectorForce") and string.find(v.Name, "Fly") then
			local part = v.Attachment0.Parent

			if part then
				local velocity = (part.CFrame.LookVector * throttle).Magnitude
				v.Force = part.CFrame.LookVector * velocity
			end
		end
	end
end

function module.Steer()
	for i,v in ipairs(Constraints:GetChildren()) do
		if v:IsA("HingeConstraint") then
			if v.Name == "RightWingFlapHinge" then
				v.TargetAngle = -steerTargetAngle * (steer - ascend)

			elseif v.Name == "LeftWingFlapHinge" then
				v.TargetAngle = steerTargetAngle * (steer + ascend)
			end
		end
	end
end

function module.Accelerate()
	if throttle < flySpeed then
		throttle += 5000
	else
		if throttle ~= flySpeed then
			throttle = flySpeed
			module.DisconnectConnection(accelerateConnection)
		end
	end
end

function module.Decelerate()
	if throttle > 0 then
		throttle -= 5000
	else
		if throttle ~= 0 then
			throttle = 0
			module.DisconnectConnection(decelerateConnection)
		end
	end
end

function module.Fly()
	if model.PrimaryPart then
		steer = VehicleSeat.Steer
		ascend = VehicleSeat.Throttle

		module.FlyForward()
		module.Steer()
	end
end

function module.Stop()
	activated = false
	module.DisconnectConnection(accelerateConnection)
	module.Propeller(false)

	coroutine.wrap(function()
		decelerateConnection = RunService.Heartbeat:Connect(function()
			module.Decelerate()
		end)
	end)()
end

function module.Run()
	activated = true
	module.DisconnectConnection(decelerateConnection)
	module.Propeller(true)

	coroutine.wrap(function()
		accelerateConnection = RunService.Heartbeat:Connect(function()
			module.Accelerate()
		end)
	end)()
end

coroutine.wrap(function()
	RunService.Heartbeat:Connect(function()
		module.Fly()
	end)
end)()

return module
#5

I was playing around with it last night. It’s not the script. It got late and I was still experimenting with it.

    1. I also see that you didn’t click on the link about how planes fly and are controlled. I added an elevator in the horizontal stabilizer (the horizontal tail control surface) and it works much better.
    1. Why do you have soooo many Parts in it? All the long line of Parts of the fuselage (the plane body) cab be made from 1 Part each.
    1. Your weld script also welds all touching Parts, making you have about 8 times the number of welds required. Most weld scripts just use 1 weld per Part. This is also made worse by having 3 times as many Parts as required.
  • 4 .Why 2 separate thrust VectorForces, 1 in each engine? You could just put 1 in the center of the aircraft. (I just put both in the VehicleSeat but you could make 1 do the same job.

I think the issue is the aerodynamics of the fuselage having the rear section angled up. I quit working on it at about 2:00 am. I’ll try again tonight.

1 Like
#6

I want to put VectorForces in each engine so that if one engine explodes, the other engine would still work like how it works in real life.

I want to make a realistic plane simulator with crash physics so that is why there are tons of parts.

#7

Wait no, I think there is actually something wrong with the script. I created a test plane and for some reason, it also turns to the right.

Video:

Code:

local RunService = game:GetService("RunService")

local model = script.Parent
local Constraints = model:WaitForChild("Constraints")

local speed = 20000

local function Fly()
	for i,v in ipairs(Constraints:GetChildren()) do
		if v:IsA("VectorForce") then
			local part = v.Attachment0.Parent
			
			if part then
				local velocity = part.CFrame.LookVector * speed
				v.Force = velocity
			end
		end
	end
end

RunService.Heartbeat:Connect(function()
	Fly()
end)
#8

Ah, I see why you had so many parts then.

The turning issue is probably due to your 2 vectorforces. When I made them centered the turning issue was fixed, it was just the up and down issue I was having.

1 Like
#9

So there is no way to fix this? I have also tried this but hasn’t worked:

local oldVelocity

local function Fly()
	for i,v in ipairs(Constraints:GetChildren()) do
		if v:IsA("VectorForce") then
			local part = v.Attachment0.Parent
			
			if part then
				if not oldVelocity then
					local velocity = part.CFrame.LookVector * speed
					v.Force = velocity
				else
					v.Force = oldVelocity
				end
			end
		end
	end
	
	oldVelocity = nil
end