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What tools do you use for CoG?

Gecko6

Gecko6

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I am working on a model that has the center point at a fixed location of my choosing. I have the offsets for the CoG and seems to be working fine. My question is this; "How do you determine the offesets for Fuel tanks, engine, flaps, spoilers, etc....?"

Do you use the Center of the object as the offset?

For instance, a TF-41-1 engine sits well behind the CoG in the Corsair. In fact behind the main struts. How do I measure the point on the engine to tell the sim where the engine truely sits?

Front fan blades?

Middle (Secondary Compressors)

Exhaust

Or do I just ballpark it and call it good?

What tips and techniques do you all have?
 
For most airplanes I've investigated, the "engine" position generally corresponds to the "point of propulsion" - I take that to be either the prop center of rotation, OR a turbine's exhaust.

In the case of the turboprops, I've basically seen the engine position being the prop center.
 
If I am not mistaken, the model center point is the default CoG.

So if I have assess to my model and can place the center point anywhere on the aircraft, then all of my CoG offsets are from that point. Unless I set a CoG offset from the model center.

Am I correct in this?

I am doing the CG shuffle right now. There has to be a more deliberate way to rangle in the CG.
 
Over the years, there's been lots of discussion on this. I think that for most people, it is more convenient to place the model center (0,0,0) to be both the empty CoG point, and the reference datum point.

If you have a program like aircraft container manager, that allows you to see a wireframe of the model, you will note that some of the default aircaft have the reference datum point at the nose of the airplane and all measurements are defined from there.

Some modellers, with the benefit of real world manufacturer data, may also position their reference datum point from the manufacturer's own data.
 
I have tried to use Visio to set up the grids to reflect real world measurements. They strech the image of the profile and top views over the grid to break down the distances. This works nice but there is a margin of error that I am running up against.

Soon my modeling team will have the production models ready and I will be able to use 3ds to measure the points.

Just wondering if their is a magic product out there or if it is better to use the center log point at the nose and then the vert and hoz points from the model?

Thanks for all your feedback up till now.
 
Well I hope dont to be...

...to insane, but I test the COG while flying.

After I tested some couple of aircraft in my life, I have to say that

the FSX flight model is really primitive. But understand this not in the bad way.

You have to make also unrealistic inputs there sometimes to come to a

realistic feeling in Microsofts Sim.

So now for the adjustment.

We can split that for the three axis of space.

The horizontal left-right value of the most planes is 0. Simple or?

Aircraft are very often symmetrical in this area, not without reason when

you want to reach a target.

The vertical position depends very very often on the engines. Same height

as propellor axis is good starting point. Fix the detail at last.

The third axis is the forward-rear axis. Here you should begin in the center

area of the wings and change the position so the plane keeps altitude

with 75 Percent power.

The rest in detail work. Only testing and feeling if its like reality.

And you dont know how its aircraft feel in reality, will not achieve reality.

How? You cannot simulate what you dont experienced.

So for the non flying personal its good to manage a believable flight situation

with the data you have. So a cool feeling is better than nothing. And who

knows like a space shuttle handles beside the NASA astronauts.

But please, make it feel COOL and the hearts are yours!

Greetings
 
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