Hi Dennis

I suppose that if you are uncomfortable with the math involved, it might be easier to TRY to use the datum line running through. It is often more difficult to do that than just saying it.

If you measure the incidence of the stab on the plans, relative to the datum line ON THE PLANS, it has been my experience that it is easier to keep the model in whatever position it wants to stay in, rathter than trying to block it up.

I used 0,0,0,0 as an example. Those that understand the math will have no problem if the stab is say, 3, the wings 0 and -1, and the engine -2. It's just a heck of a lot easier to determine the incidences on a set of plans that will hold still then a fuse. If you have only one incidence meter, the problem gets worse.

You SHOULD be able to rely on measurements from the plans since they were what the model was constructed on.

JR