70 to 1 L/D Electric Sailplanes

[michael henderson]

Very interesting article with Brian Seeley at Comparative Aircraft
Flight Efficiency.

See:

http://www.msnbc.msn.com/id/35258761/ns/technology_and_science-innovation/

Michael

[Dave Nadler]

On Feb 5, 8:16*pm, michael henderson > wrote:
> Very interesting article with Brian Seeley at Comparative Aircraft
> Flight Efficiency.
>
> See:
>
> http://www.msnbc.msn.com/id/35258761/ns/technology_and_science-innova...
>
> Michael

Antares 20E max L/D is merely 56:1, but much more
important is high-speed performance. Ballasted, 41:1
at 100 knots, 31:1 at 120 knots.

Not sure where he's seeing 70:1 though...

Best Regards, Dave "YO electric"

PS: His name is Brien Seeley (not Brian)

[JS]

The article refers to sailplane DESIGNS, not actual sailplanes with
70:1 glide ratio.
Gerhard Waibel's 2002 Barnaby Lecture on "The Sailplanes Of
2020" (which he changed to 2050 so he won't be asked to prove it)
included solar powered suction control of the boundary layer, and the
likelihood of achieving 70:1 with it.
Jim


On Feb 5, 6:45*pm, Dave Nadler > wrote:

> Not sure where he's seeing 70:1 though...
>
> Best Regards, Dave "YO electric"
>
> PS: His name is Brien Seeley (not Brian)

[Dave Nadler]

On Feb 6, 2:32*pm, JS > wrote:
> The article refers to sailplane DESIGNS, not actual sailplanes with
> 70:1 glide ratio.
> * Gerhard Waibel's 2002 Barnaby Lecture on "The Sailplanes Of
> 2020" (which he changed to 2050 so he won't be asked to prove it)
> included solar powered suction control of the boundary layer, and the
> likelihood of achieving 70:1 with it.
> Jim
>
> On Feb 5, 6:45*pm, Dave Nadler > wrote:
>
> > Not sure where he's seeing 70:1 though...
>
> > Best Regards, Dave "YO electric"
>
> > PS: His name is Brien Seeley (not Brian)

Sailplanes already exist with 70:1 ie Eta,
but not electric ones. Maybe that's what
Brien is thinking about.

IIRC Concordia is shooting for 75:1 according
to the presentation Waibel and Boerman gave
at the SSA convention (but could not support
a motor or batteries). Dick of course was home
working on the glider rather than talking about it ;-)

See ya, Dave "YO electric"