d b wrote:

In article , Robert Ehrlich wrote:
d b wrote:

I'm sure somebody may correct me, but as I recall, the TE probe produces
a signal equal and opposite of the pitot (total pressure).

Not exactly, total pressure is static + dynamic, TE is static - dynamic.

Let's put it this way. The indicator reads the difference in pressure between
the hole called P and the hole called S. When I hook the hole called P to a
pitot tube and the hole called S to a perfect static source, I get a number,
let's say 70.

Now I hook a TE probe to the hole called S and the perfect static to
the hole called P. The indicator again reads 70. Obviously, the TE probe is
the exact opposite of the pitot tube.

It is agreed that the pitot is the total energy static + dynamic
The obvious conclusion is that the TE probe is - (static + dynamic)

It is NOT static - dynamic, it IS -(static+dynamic)

Kinda sucks, doesn't it?

No, the reading of your indicator is P - S, converted into whatever speed
unit you like. If P is connected to a pitot tube and S to a perfect static
source, P - S is total - static = (static + dynamic) - dynamic) = dynamic).
When P is connected to a perfect static source and S to a TE probe,
P -S = static - (static - dynamic) = dynamic again, so the reading are the
same.