On Sep 7, 11:06*am, Darryl Ramm wrote:
On Sep 7, 11:01*am, jb92563 wrote:





On Sep 7, 10:03*am, Andy wrote:

On Sep 7, 9:31*am, Brad wrote:

I have my HP-24 set up with the iPAQ 310 and it is running the latest
LK8000 software, since the aircraft hasn't flown yet I am curious to
know if anyone out there is using this combination and what they have
noticed regarding the wind calculation function (not the true wind
feature).

If you are using the HP310 internal GPS you can expect the LK8000
circling wind calculation to produce an unreliable wind estimate
unless you thermal at a very low turn rate.

In small Arizona cores that require high bank angles my experience is
that the internal GPS gets hoplessly confused and the wind estimate
cannot work because it does not have good circling position data.

In smooth late afternoon thermals worked at low bank angles the wind
estimate is in the same ball park as my 302 with Glide Nav II.

I don't think there is anything wrong with LK8000 wind calcs but you
will need an external GPS with a fast update rate to give it a chance
of producing a valid result.

Andy

I concur that the higher turn rate reduces the ability to get a good
wind direction fix.

It seems to me that the reason might be that the position fixes are
produced at a maximum rate of 1/sec under ideal conditions
and that just does not seem to be enough resolution when making small
circles.

I wonder if there is a way to get more fixes or create your own
virtual fixes by projecting a position based on the turn rate and
average diameter to help out the wind calculator?

Ray

I think this has all been covered in the past.

It is not the update rate, it is the iPAQ 310 internal GPS doing
position extrapolation/smoothing *based on past velocity - designed
for road navigation. This "feature" cannot be disabled in the internal
GPS, technical folks have tried...

Use an external GPS and you'll be fine. Presumably an external
bluetooth will work, I've not tried it. This was one of the
limitations with the iPAQ 310 that many of the early purchasers,
including me, discovered to our annoyance.

Darryl

Thanks guys, I just talked to Paul Remde and bought an external GPS
unit that will plug right in to the PS-5a and send all the info to the
310.

I just got back from a mountain flying expedition and the wind info
was critical to my successful flights...............at least it seemed
to help me a lot and I will want the same features for the HP-24.

Darryl, yep......you're right..........this subject has come up often
and now for me I dropped the dime and have some resolution!

Brad