Question for US Rules committee on AH capability within LX NAV computers?

Hi Sean,

I'm not sure I understand your argument. The XCSoar and LK8000 software
products (which I hear are very nice) are (if I understand correctly)
opensource products. The code is freely available.

The LXNAV LX8000, LX8080 and LX9000 are not opensource. They are products
that have firmware that is not freely available. Updates to those LXNAV
products is done by requesting a new version of the firmware from LXNAV
which is tied to a particular unit serial number. It would not be possible
for anyone other than LXNAV to make changes to those products. They have
recently implemented features in the firmware which make it easy to disable
the artificial horizon for 14 days - longer than any contest. Also, it is
easy for any contest official to look inside the glider and determine
whether or not the AHRS unit is installed and connected to the flight
computer. It connects to the flight computer using a standard USB cable.
If there is no USB cable connected to the flight computer, then the AHRS is
not connected. This is much different than the opensource software issues.

However, I strongly agree with you that it is silly and frustrating that the
rule committee has decided to restrict our technology. It discourages
innovation and discourages pilots from flying in U.S. soaring competitions.

Best Regards,

Paul Remde

"Sean F2" wrote in message
news:32549288.367.1333683984277.JavaMail.geo-discussion-forums@ynbv36...
XC Soar and LK8000 are useless mobile based, unfixed 1g gyro's on mobile
phones and faced direct demands from the USRC.

LXNAV has a huge high priced capability and not a peep?

Follow the money...



On Thursday, April 5, 2012 9:23:37 AM UTC-4, David Reitter wrote:
On Thursday, April 5, 2012 8:58:00 AM UTC-4, Sean F2 wrote:

It is unethical for the USRC to make bold public requirements for some
and not for the
manufacturer who has the most lethal "in terms of cloud flying"
capability. We need to see
a ruling on the requirement of firmware for LXNAV vs the LXNAV dealers
and customers
saying "its ok...wink...ill just...wink...remove the box." Wink
wink...;-)

I think there's a misunderstanding.

A competition-ready version of XCSoar can ascertain a lack of cloud-flying
instruments to extent that a lack of the AHRS box can. You can
circumvent the XCSoar/Comp restriction by installing another XCSoar
version in a hidden place, by taking a second PDA, by installing it via a
data-link and removing it, and so on. Similarly, you can hide your
sensor box somewhere. Either variant of cheating is relatively easy to
accomplish.

Such rules make it (a little) harder to cheat, but not impossible. The
may or may not be in the interest of safety, and they are certainly silly
in the light of the dysfunctional XCSoar horizon, but it seems that they
apply to everybody and all devices. No AHRS box - no IMC instrument. No
XCSoar with "horizon" - no instrument. Butterfly horizon disabled for 14
days - no instrument. And so on. Simple as that.