varios not using a total energy probe

"Mike Borgelt" wrote in message
...
On 16 Apr 2004 03:27:43 -0700, (Robert) wrote:

Hello! Can someone tell me which compensated varios do not need a
total energy probe? (no electronic compensation) Thanks a lot! Robert

While some people report good results with pitot/static TE your
results may differ. I wonder if thy've tested two identical varios
capable of being on pitot/static or TE side by side on the same
sources then on the different sources side by side. I've done this
with TE probes mounted in different places on the ship and got
interesting results.The gear doors are a good location for a TE probe.

I have one pitot/static TE vario (With dedicated static ports.) and one TE
probe vario (B40)

Generally pitot and static probes/ports are much more sensitive to
sideslip than are good TE probes.(Good TE probe = Irving type two hole
probe )

True, it's easily observed.


You may have timing issues due to the distributed flow resistance and
capacitance of the sailplane plumbing.

Yep, the TE probe vario is about 0.25-0.5 sec slower than the pitot/static
vario at the onset of lift. Mike, do you think this is due to the long
tubing run to the fin mounted TE probe?


Remember for pitot/static TE you are measuring two large signals and
subtracting them. Minor timing differences in the signals and small
non linearities in the measurement show up as large unwanted
transients on your vario.

Hmm, they seem to track together most of the time but there are differences.
I trust the B40 the more.

Thanks for the comments, Mike.

Bill Daniels