Hi,

No. The needs is driven by an electrical stepper-motor, so it won't work if
there is no power. However, the V3 can be powered by an small backup
battery or battery pack. It operates on as little as 6V. A battery pack
from Radio Shack that holds 4 to 6 AA batteries would work great as a
backup. A panel mounted switch could be used to switch to the backup
battery pack if the main battery gets too low. Or, you could use 2 main
batteries and switch between them as necessary - that is very commonly done.

Best Regards,

Paul Remde
Cumulus Soaring, Inc.

"Echo" wrote in message
...

Can the mechanical needle of the V3 function without electrical input? So,
if a total power loss, any vario function left? Thanks,

Jordan
ASW20 E

On Friday, December 28, 2012 8:02:49 AM UTC-6, Paul Remde wrote:
The V3/V7 price difference is interesting. It must be mainly justified
by

marketing rather than the different electronics?



Hi,



There is a big hardware difference between the V7 and V3. The V7 has
pitot

an static inputs and can therefore display push/pull (speed-up/slow-down)

commands. The V3 does not have pitot or static inputs. It can tell you
how

fast to fly, but it doesn't know how fast you are flying, so it can't tell

you to speed-up/slow-down. The V3 is a great new idea. It is a Total

Energy vario with audio, with the ability to display the recommended

speed-to-fly based on your glider's polar and the current MacCready
setting

and the current lift/sink. It is a lot like having a smart MacCready ring

on a mechanical vario. You can see details he

http://www.cumulus-soaring.com/lxnav.htm#LXNAV-V3



Best Regards,



Paul Remde

Cumulus Soaring, Inc.