2-Batteries

wrote:
By all means a second battery should be installed in our electrically
driven modern sailplanes. After many years of quickly flipping my
3-position battery switch, and trying not to have my logger to
momentarily dropout,

I thought all loggers just started again after a momentary power loss,
and continued the same flight file. It sounds like yours isn't behaving
properly, or are some brands a bit touchy?

--
Eric Greenwell - Washington State, USA
* Change "netto" to "net" to email me directly
* "Transponders in Sailplanes" http://tinyurl.com/y739x4
* "A Guide to Self-launching Sailplane Operation" at www.motorglider.org

Eric Greenwell wrote:
wrote:
By all means a second battery should be installed in our electrically
driven modern sailplanes. After many years of quickly flipping my
3-position battery switch, and trying not to have my logger to
momentarily dropout,

I thought all loggers just started again after a momentary power loss,
and continued the same flight file. It sounds like yours isn't behaving
properly, or are some brands a bit touchy?

There are some earlier approved flight recorder designs that will start
a new flight data file if the 12V power supply is interrupted
momentarily. The specifications were then changed to eliminate this
behavior from newer designs...

Marc

I wish it were so. While most loggers can handle a momentary power
loss, not all can. I spoke at the last convention on this and related
avionics wiring issues. I contacted each manufacturer and as of Feb,
2006, I compiled the information below. I need to add the EW
MicroRecorder. I will be speaking on Saturday at the Memphis
convention if you are interested in more details.

2:00PM 3:00PM John DeRosa
Understanding Soaring Recorders and Computers
Convention Center Ballroom C

3:15PM 4:15PM John DeRosa
Aviation Electrical And Electronic Wiring Basics
Convention Center Ballroom C

- John DeRosa "67R"
======================
Cambridge
During a power Interruption, will IGC file be maintained?: Yes
How long of a power interruption can be survived?: 2 hours with aux
battery, otherwise no response
Start new log file?: 5 mins before starting new log file
Require secondary power source?: CAA-117 auxillary battery
Other information maintained?: Yes
Minimum operational voltage?: 8vdc is guaranteed but 6vdc is possible

Garrecht Volkslogger
During a power Interruption, will IGC file be maintained?: No, new file
How long of a power interruption can be survived?: 0.1 sec
Start new log file?: Yes
Require secondary power source?: Yes
Other information maintained?: Yes
Minimum operational voltage?: 7vdc

LX Navigation
During a power Interruption, will IGC file be maintained?: Yes
How long of a power interruption can be survived?: Approximately 1 min
Start new log file?: 1 min before starting new log file.
Require secondary power source?: No
Other information maintained?: Yes
Minimum operational voltage?: 8vdc

New Techologies
During a power Interruption, will IGC file be maintained?: Yes
How long of a power interruption can be survived?: few seconds
Start new log file?: 5 mins before starting new log file
Require secondary power source?: No
Other information maintained?: Yes
Minimum operational voltage?: 8.9vdc

Borgelt
During a power Interruption, will IGC file be maintained?: Yes
How long of a power interruption can be survived?: hours to weeks
Start new log file?: no response
Require secondary power source?: Internal "super" capacitor
Other information maintained?: Yes
Minimum operational voltage?: 10.0vdc




Eric Greenwell wrote:

I thought all loggers just started again after a momentary power loss,
and continued the same flight file. It sounds like yours isn't behaving
properly, or are some brands a bit touchy?

On Jan 1, 5:28 pm, "ContestID67" wrote:
Garrecht Volkslogger
During a power Interruption, will IGC file be maintained?: No, new file
How long of a power interruption can be survived?: 0.1 sec
Start new log file?: Yes
Require secondary power source?: Yes
Other information maintained?: Yes
Minimum operational voltage?: 7vdc

I have heard stories that the Volkslogger will also create a new
declaration on power up. That is, it sets the timestamp of the
declaration that is currently stored to be the time of power on. Any
idea this happens? Though, since one is already splicing together two
logs, the declaration of the previous log should be good enough.

The CAI 302, on the other hand, will not update the declaration (with
the timestamp of when it was made) until it starts a new log. This is
after about 5 minutes of "inactivity". I sent a concern to CAI a while
ago about this, as there could be a situation where a pilot will decide
to make a new declaration during a quick relight. If no OO is
available to do a paper declaration, then only the electronic one can
be used - and it's possible it won't take. (Consider a self-launcher
at an unattended airport).

....No matter how had one thinks during the design, the application will
always be different...
-Tom