Kawa rough landing?

On Tuesday, 10 September 2019 14:45:04 UTC+3, Peter F wrote:
At 08:05 10 September 2019, krasw wrote:
There has been FES selflauncher accident because powerplant failure and
one
really close call. They aren't any better.


Can you provide links to these incidents?

I would expect them to ba at least 1 order of magnitude better than the
traditional turbo.

https://aviation-safety.net/wikibase/195172

Not sure if close call has been documented as incident.

On Tuesday, September 10, 2019 at 7:45:04 AM UTC-4, Peter F wrote:
At 08:05 10 September 2019, krasw wrote:
There has been FES selflauncher accident because powerplant failure and
one
really close call. They aren't any better.


Can you provide links to these incidents?

I would expect them to ba at least 1 order of magnitude better than the
traditional turbo.

https://app.ntsb.gov/pdfgenerator/Re...relim&IType=LA

On Tuesday, September 10, 2019 at 11:09:12 AM UTC-4, Tango Eight wrote:
On Tuesday, September 10, 2019 at 7:45:04 AM UTC-4, Peter F wrote:
At 08:05 10 September 2019, krasw wrote:
There has been FES selflauncher accident because powerplant failure and
one
really close call. They aren't any better.


Can you provide links to these incidents?

I would expect them to ba at least 1 order of magnitude better than the
traditional turbo.

https://app.ntsb.gov/pdfgenerator/Re...relim&IType=LA

oh, and of course...
http://sustainableskies.org/two-batt...ng-sailplanes/

T8

On Tuesday, September 10, 2019 at 11:09:12 AM UTC-4, Tango Eight wrote:
On Tuesday, September 10, 2019 at 7:45:04 AM UTC-4, Peter F wrote:
At 08:05 10 September 2019, krasw wrote:
There has been FES selflauncher accident because powerplant failure and
one
really close call. They aren't any better.


Can you provide links to these incidents?

I would expect them to ba at least 1 order of magnitude better than the
traditional turbo.

https://app.ntsb.gov/pdfgenerator/Re...relim&IType=LA

"His last calculation of remaining battery energy was about 20 minutes from DXR,
when he noted about 20% battery life remaining. As he prepared to enter the DXR traffic pattern for landing on runway 26, he noted that the glider's altitude was low. He turned on the electric motor; however, it produced only minimal power and the glider continued to lose altitude until it impacted trees and a house 2.7 miles northeast of DXR."

That one was neither a close call (alas), nor a powerplant failure. Rather an empty battery, due to prior self-launch and cruise, without securing alternatives. Analogous to running out of gasoline. It is not evidence against the claim that FES is inherently more reliable than traditional turbo. Besides the electric motor starting reliably (as long as one keeps some "fuel in the tank"), there is also no added drag like from the boom of a retractable engine (of any type).

On Sunday, September 8, 2019 at 10:20:53 AM UTC-7, krasw wrote:
http://www.sebastiankawa.pl/13060/o-...bGJ8ugxxXHZS58

Google translate:
"During the last training flight they locked Sebastian in a narrow 30-kilometer valley without landing spots. The possibility of escape was to be provided by an efficient electric drive system. "

There you go. Glad he did not hurt himself more seriously.

In the pics there is a lake. I know it is not everyone's first choice, but in desperate situations like this, with an electric and batteries, should the lake be avoided? Or would it have been a better choice in hindsight?