Even with the new battery tech you'll only get
about 1 hour endurance at cruise power (65%)if
you replace the Rotax and max (optional 31.7 US gallons) fuel.
Nice self launcher with good retrieve capability
but you lose the "travelling motor glider" bit.
With electric it is probably not optimum to have
the nose mounted folding prop either. A
retractable rear mounted electric motor on a
streamlined retractable pylon may give you a more
efficient larger diameter propeller and a shorter
and lighter landing gear. That would
translate into more battery capacity of course or a lower flying weight.
Electric flight will work for self launch gliders
because the power is usually required for only a
few minutes. Same for jet gliders. Doesn't work
for any kind of serious cruise capability. The
other place electric will work is in distributed power for VTOL small aircraft.
The new battery tech makes a 600 Kg two seat VTOL
aircraft possible with good cruise speed and
range but using an IC engine for cruise and
battery/electric for takeoff and landing.
The battery tech I'm talking about is
here:http://www.solidenergysystems.com/ and here
http://www.nature.com/nature/outlook/batteries/pdf/batteries.pdf
The "secret sauce" appears to be the safe electrolyte.
This outfit looks good to me because the
batteries can be built on existing Li-ion battery
manufacturing equipment so no vast capital
investment required. As they say, they don't want
to manufacture batteries but will licence their
chemistry so I'd expect the batteries to
come from existing battery manufacturers and
price shouldn't be too high either. They are
talking about commercial electronic applications
now and EV applications in 2018. Given the usual
rules of hi tech (everything takes longer and costs more) you may be able to
buy these batteries around 2020 I think.
Mike
At 05:54 AM 9/18/2016, you wrote:
âWhat he saidâ - Iâm curious about that too.
Brand, $$, availability, and (importantly, also) size?
My long term dream is to throw the Rotax 914F
out of my Stemme and replace it with batteries
and an electric motor, and if a combination of
both existed that had roughly the same total
mass, the result would be transformative (in my view).
âGo ahead, make my dayâ :)
Cheers,
Simon
On 17 Sep 2016, at 8:23 PM, Peter Champness
<<mailto:[email protected]>[email protected]> wrote:
What new battery technology is that?
On Sat, Sep 17, 2016 at 5:57 PM, Mike Borgelt
<<mailto:[email protected]>[email protected]>
wrote:
There is also a GP15 15 meter version under
construction. Same fuselage as the 13.5 M
version. Nicer looking than the Diana 2.
The wing sure looks similar to that on a Diana
2 but with winglets. The 13.5 M version wing
weighs 31 Kg each side. Easy to rig by one person.
The 15M looks to be a seriously good
competition glider with a very wide wing
loading range. Electric self launch too. (Fully
retractable, not the silly FES).
A welcome change from the trend to making gliders converge on the B-52.
There is some new battery tech on the horizon
too which will mean a 10Kw-hour battery weighs
only 25 Kg. Allegedly will be safer than
current Li-ion tech too. This should be enough
for a launch and subsequent climb of at least 8000 feet.
However will the sport cope with all self launching gliders?
Mike
At 04:52 PM 9/17/2016, you wrote:
The glider Ron is referring to, is the GP14
Velo
<http://www.gpgliders.com/>http://www.gpgliders.com/
, which is still under construction as far as
I know, and nothing to do with the Diana 2.
The Diana 2 is type certified, as of last year.
<https://www.easa.europa.eu/system/files/dfu/TCDS_A_451_SZD-56_Diana_issue_02.pdf>https://www.easa.europa.eu/system/files/dfu/TCDS_A_451_SZD-56_Diana_issue_02.pdf
The 13.5m Diana 2 "Versus" exists and is
almost certainly the best 13.5m glider.
Beres BogumiÃ
, the man behind the Diana 2 passed away earlier in the year.
What happened after that is a bit murky, but
my understanding is the assets were sold to
SZD (there's multiple SZD's, it's confusing),
who is once again producing the Diana 2, and
*allegedly* producing one with a fuselage that
has lower angle of attack on the ground, and an 18m stretch.
On Sat, Sep 17, 2016 at 3:30 PM, Tom & Kerrie
Claffey <<mailto:[email protected]>[email protected]> wrote:
Nope,
The Versus (13.5M experimentalà version of
Diana2)Ã was flown by Stefano Giorgio who won
the first 13.5M WGC in it. The glider
Sebastian was going to fly, but they ran out
of time, is a different, all new glider.Ã
Since then the 13.5 M class is supposed to go electric self launch.
I think the 15M Diana 2 is soon out of the WGC
due to time fromà prototype to certification.Ã
(There is someà limit)
Having seen a few of them I would not own one, talk to Mak.
Tom
...
On Saturday, 17 September 2016, Ron Sanders
<<mailto:[email protected]>[email protected]> wrote:
Hey guys out there,
Anyone know what is happening with the Diana 2 these days??
Last i heard was à a 13.5 metre version was
gonna be flown by Sebastian Kawa at some GP thing and it didn't make it.
Ron
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