Do your straps up tightly for winch launches!

Looking at the diagram of the instrument layout in
this glider, it would appear that the total energy
tube was connected to the fuselage statics and then
in turn to all the pressure instruments. I would guess
that effect of the total energy tube on the ASI would
therefore be greatly reduced due to leakage through
the normal static holes.

Derek Copeland


At 10:06 18 October 2006, Phil Collin wrote:
For the full report see the following URL
http://www.aaib.dft.gov.uk/publicati...ptember_2006/g
laser_dirks_dg600_glider__bga_3445__tail_number_ 656_.cfm



Bert Willing wrote:
Doug,

the reading of an ASI is very rarely connected to
winch launch accidents,
and certainly not in the initial climb.
Sliding back in the seat (or movement of a seatpan)
during initial rotation
has already claimed a number of lives.

Bert

'Doug Haluza' wrote in message
oups.com...
Derek Copeland wrote:
Wouldn't the exact effect depend on the relative areas
of the pot pitot and the usually very small holes
in
the T.E. probe? The AAIB are normally very thorough
in their investigations, so I am happy to believe
them,
and that this error was not the primary cause of the
accident. Neither am I recommending that you should
connect your instruments up in this way.
No, the area of the openings would not matter, unless
there was a
significant leak.

If your description is correct, then I would not assume
that the
primary cause was the straps, which as you point out
could not be
conclusively determined due to post impact damage.
Can you check the
report again and make sure you have correctly reported
the results?





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