On 7/23/2012 1:18 PM, Steve Koerner wrote:
A pitot connection alone cannot give you total energy. In fact, it
gives you backwards total energy. Kinetic energy increase results
increased pitot pressure yet potential energy increase is associated
with reduced pitot pressure. This problem can get resolved when you
also connect to a static port and do the math.

Now, pitot ports are fairly foolproof and always give good signal.
But, not so for static ports. Static ports are easily fooled by
changes in AOA and yaw. On fuselage static ports are usually
hopeless for use in delta P varios. The best bet for a static port
are those tied to a modern triple probe. And that begs the question:
why bother if you are going to install a modern triple probe anyway?

The triple probe is usually in the prop wash of a self-launcher,
rendering it almost worthless under power. Using the fuselage
pitot/static avoids that problem. That's why I do it, but I'm not sure
the original poster had in mind.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to
email me)
- "Transponders in Sailplanes - Feb/2010" also ADS-B, PCAS, Flarm
http://tinyurl.com/yb3xywl
- "A Guide to Self-launching Sailplane Operation Mar/2004" Much of what
you need to know tinyurl.com/yfs7tnz