On Mar 2, 12:29*pm, Bob Whelan wrote:
Who out in RAS-land is convinced mankind has finished 'discovering' all
the ways sport sailplane pilots can 'usefully extract soaring energy'
from the atmosphere? Raise your hands.

Had the same question been posed in (say) 1922, and again in (say) 1932,
I'm reasonably satisfied a significant proportion of soaring aficionados
of those times would've raised their hands.

In 1922, because likely few imagined 'useful thermals' (despite
plentiful evidence to the observant of convection's commonness and power)....

In 1932 because likely few(er) imagined something akin to atmospheric
waves (despite air being a fluid, and rocky streams, and several
centuries' practice with deductive, scientific thought)...

Today, it's generally scientifically accepted some birds (e.g. albatrii)
'usefully dynamically soar.' *So what makes us persist in believing that
dynamic soaring can 'usefully be done' either: a) only at the bottom of
the boundary layer (and then, only over water) and b) (maybe, perhaps,
on a good day, and only with the government's blessing & [here insert
your favorite skepticisms]) on the fringes of the jet stream?

Using the intermountain western U.S. as a deductive point of departure
(only because that's the part of the soaring world with which I'm most
familiar, and in no way intending to limit others' use of their
imaginations as a point of departure from their experiences), the times
when 'significant at-soaring-levels wind shear' is NOT present on
'easily convectively soarable days' is probably considerably below 50%.
* Heavens! *In these latitudes and over our bumpy terrain, I'd be
shocked if such shear isn't more common than 'usefully convective
conditions.' *Why not attempt to figure out how to 'use' the energy
differences/concentrations rather than curse their (too often negative)
disruptive influences on the convection we all know and love?

What are we to make of someone of the credibility/experience of (e.g.)
an Ingo Renner claiming to have done 'nothing more' than 'sustain over
his launch airport' (for 30 minutes) via dynamic soaring over the flats
of Australia ~30 years ago? And what about Gary Osoba's Carbon Dragon
microlift/dynamic/'lift-line' soaring experiences?

Human history has repeatedly shown the absence of a 'thing' (in this
case, 'demonstrably useful dynamic soaring conditions') isn't proof of
its non-feasibility. *I think it's darned cool we have dreamer/creators
as Danny Howell and Greg Cole in our soaring world, while also having
benefited from generations of earlier counterparts (Wolf Hirth/etc.,
Phonix folks, Eugen Hanle, Waibel/Holighaus/etc., etc.., etc.) advancing
both the state of the hardware art and allowing/encouraging us selfish
pilots to advance the state of the 'demonstrated possible' soaring art.

There's a place for skepticism of course...for one thing it helps keep
some of us alive longer. *Happily, sailplane design isn't limited to
only those who imagine refining along the path of 'commonly accepted
wisdom.' *Witness Howell's and Cole's plastic sailplane design efforts.
* I only wish I could be one of the selfish pilots having their
sailplane tools in my hands!

Dreamily Yours,
Bob W.

And consider the r/c guys in CA who in under a decade defied the
limits of logic and are now knocking on the door of 400 mph with home-
brewed models sailplanes. There seems to be boundless energy for those
who seek it!

/Adam