AT, TAT, MAT?

On Oct 11, 11:30*pm, "noel.wade" wrote:
Thanks all,

This may sound egotistical, but when I'm alone or with one or two
other gliders I'm pretty confident my thermaling skills are above-
average (I admit that I still need work in gaggles). *I tend to circle
a little bit faster than some folks (usually 48 - 50 knots in my
DG-300), but I turn at a tight 45 - 50 degree bank angle - never less
(narrow thermals here in the west). *Doing the math on load factors at
various bank-angles, and given my min-sink speed of about 42 knots, I
think this thermaling speed may be about right (despite some "advice"
that I should be circling slower). *The glider certainly doesn't
"groove" through the turns as well when I really try to slow it up and
fly in the mid-to-lower 40's at these bank angles. *BTW, I don't
credit my climb capabilities to talent or anything; I just got started
flying in a place where 1 - 2 knot lift was the norm, and cloudbases
are typically around 3000'. *If you want to get anywhere in those
conditions, you *cannot* miss a climb or lose a thermal!

I just got "Winning II" last night, and I'm glad to hear someone with
John's experience discount Moffat's thermal entry technique. *The
vario swings due to TE compensation and the sudden/aerobatic thermal
entry at 80+ knots seems like it would make it incredibly hard to
judge what the thermal strength truly is (in addition to the safety
issues if you rocket up farther than expected and wind up smack in the
middle of a gaggle that's already circling).

Oh, and unless I'm really low I _never_ make S turns and hunt. :-) *I
usually have 2 "targets" in mind when I set out on each inter-thermal
glide; a primary thermal marker (or best guess) and a backup somewhere
beyond it along my course-line. *I try to only slow down and hunt if I
hit bumps or other evidence of lift where I'm already expecting it at
these target-points. *But sometimes I feel like I've bypassed a good
thermal along the way (perhaps better than the one I'll find at my
target area). *Like I said in my earlier post, occasionally I try for
these "good bumps" - and get skunked most of the time. *And the cost
of slowing down, turning a circle (even just one) for no gain, and
then speeding back up is just HUGE.

I just don't know if the "cure" is to avoid circling at all in these
situations, or if there are better ways to determine if the lift is
big enough or good enough to work without actually throwing in a
circle.

Thanks for the tip on downloading race flights/IGC files. *I've been
meaning to do that, now its time I actually follow through!

Take care,

--Noel

Try this
http://www.coloradosoaring.org/think...calculator.htm

Frank