At 16:18 21 February 2016, Dan Daly wrote:
On Saturday, February 20, 2016 at 1:23:11 PM UTC-5,
wrote:
Anything interesting to report from Christoph Wannemacher's
presentation
=
on "Design Philosophy for the New Ventus" e.g information on
the aspect
rat=
io, aerofoil, wing thickness, transition position, turbulators etc?
=20
John Galloway

From my notes:
600kg
10.83 m2/116.575 sq ft
55.4 kg/m2 11.35 psf
AR 29.9
sport (little - 2cxa size - based on 2cxa) side-hinged canopy
Goal of certification and having a number available for WGC
Bennala
down the road, FES and T
then
performance edition (larger)
quintus cockpit
self-launch
(T or FES if demanded... but SL first)

Description of new wx model; validation using WGC Uvalde data
and Euro
cham=
pionship. Result - you have 2 modes, thermalling or fast and
spend almost
=
no time at best L/D. goal to optimize for these 2 modes.

climb perf in weak small thermals - data from euro contests - lift
that
V2C=
XT couldn't climb in, V3 had theoretical 15 kph x-c speed
(contests are
won=
or lost on the weakest days).

Goal of increased cross-country speed.

Started with an aero check of Arcus from large contests to
validate that
ae=
rofoil. Result - good basis for start of work on V3 ("new Ventus"
accordin=
g to S-H marketing but informally known as V3).

General of description of wing evolution from original Discus to
this;
disc=
ussion of winglets too (didn't take notes)

wing thickness
root 14.8%
closing in to root 12.9%
outboard of spoiler box 13.2%
blend near winglet 13.1%

Horizontal tail volume/area reduced

Flutter - certification for CS22 AL2 - higher torsional stiffness
Fuselage - higher crashworthiness =3D heavier fuselage

2 sets of water tanks (one small below bigger) - one release like
zig-zag
-=
looks like you dump the big one but keep a smaller volume that
doesn't
slo=
sh when you have partial water (not stated but that's what it
looked like
t=
o me - I have been wrong on this kind of thing).

Jan 29 first flight; to briefing date 20 flights / 13 hrs (wx has
sucked
in=
Europe)

Next, turbo in sport fuselage ~ 4-5 weeks. FES "in summer"

In 6 weeks, mockup of big version; canopy to be forward-hinged
carbon-fibre.

"later" - solo 2625-01 injected SL system - better high and hot

Questions - wing soft/stiff? Stiff. ran out of time for more...

Overall, an impression of a fast-moving, ambitious programme
that starts
wi=
th the pure gliders (small then big), and as resources permit,
moving to
tu=
rbo, then SL, then FES (if there is demand).

I think I have most of this correct - I was trying to pay attention
and
scr=
ibble mostly legible notes. =20

If you have questions, best to ask the dealer...

Thanks Dan. Very interesting. I asked the UK dealer for this type
of information a couple of weeks ago but none was available
then.
JG